added spdlog

CMakeLists.txt

@@ -7,12 +7,10 @@ LIST(APPEND CUDA_NVCC_FLAGS --default-stream per-thread; -std=c++11; -g; -O3; -a
 add_definitions(-DCUDA_API_PER_THREAD_DEFAULT_STREAM)
 SET(CUDA_PROPAGATE_HOST_FLAGS OFF)
 
-add_definitions(-DBOOST_LOG_DYN_LINK)
-
 include_directories(${amunn_SOURCE_DIR})
 find_package(CUDA REQUIRED)
 
-find_package(Boost COMPONENTS system filesystem program_options timer log)
+find_package(Boost COMPONENTS system filesystem program_options timer)
 if(Boost_FOUND)
     include_directories(${Boost_INCLUDE_DIRS})
     set(EXT_LIBS ${EXT_LIBS} ${Boost_LIBRARIES})

src/common/logging.h

@@ -1,5 +1,5 @@
 #pragma once
 
-#include <boost/log/trivial.hpp>
+#include "spdlog/spdlog.h"
 
-#define LOG BOOST_LOG_TRIVIAL
+#define LOG(logger) spdlog::get(#logger)->info()

src/decoder/decoder_main.cu

@@ -10,22 +10,19 @@
 #include "printer.h"
 
 History TranslationTask(const std::string& in, size_t taskCounter) {
-  LOG(info) << "Line " << taskCounter
-            << " (thread " << std::this_thread::get_id() << "): "
-            << in;
-  
   thread_local std::unique_ptr<Search> search;
   if(!search) {
     LOG(info) << "Created Search for thread " << std::this_thread::get_id();  
     search.reset(new Search(taskCounter));
   }
-            
+  
+  LOG(progress) << "Line " << taskCounter << " | Input: " << in;
+  
   return search->Decode(God::GetSourceVocab()(in));  
 }
 
 int main(int argc, char* argv[]) {
   God::Init(argc, argv);
-  std::ios_base::sync_with_stdio(false);
   boost::timer::cpu_timer timer;
   
   LOG(info) << "Reading input";

src/decoder/god.cu

@@ -22,7 +22,12 @@ God& God::Init(int argc, char** argv) {
 }
 
 God& God::NonStaticInit(int argc, char** argv) {
-
+  info_ = spdlog::stderr_logger_mt("info");
+  info_->set_pattern("[%c] (%L) %v");
+  
+  progress_ = spdlog::stderr_logger_mt("progress");
+  progress_->set_pattern("%v");
+  
   po::options_description general("General options");
   
   std::vector<size_t> devices;

src/decoder/god.h

@@ -55,5 +55,8 @@ class God {
     
     std::vector<ScorerPtr> scorers_;
     std::vector<float> weights_;
+    
+    std::shared_ptr<spdlog::logger> info_;
+    std::shared_ptr<spdlog::logger> progress_;
 };
 

src/decoder/printer.h

@@ -4,6 +4,11 @@
 
 template <class OStream>
 void Printer(const History& history, size_t lineNo, OStream& out) {
+  LOG(progress) << "Line " << lineNo
+    << " | Best translation: "
+    << God::GetTargetVocab()(history.Top().first)
+    << " ||| " << history.Top().second->GetCost();
+    
   if(God::Get<bool>("n-best-list")) {
     NBestList nbl = history.NBest(God::Get<size_t>("beam-size"));
     for(size_t i = 0; i < nbl.size(); ++i) {

src/spdlog/LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 Gabi Melman.                                       
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+

src/spdlog/async_logger.h

@@ -0,0 +1,74 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Very fast asynchronous logger (millions of logs per second on an average desktop)
+// Uses pre allocated lockfree queue for maximum throughput even under large number of threads.
+// Creates a single back thread to pop messages from the queue and log them.
+//
+// Upon each log write the logger:
+//    1. Checks if its log level is enough to log the message
+//    2. Push a new copy of the message to a queue (or block the caller until space is available in the queue)
+//    3. will throw spdlog_ex upon log exceptions
+// Upong destruction, logs all remaining messages in the queue before destructing..
+
+#include <spdlog/common.h>
+#include <spdlog/logger.h>
+
+#include <chrono>
+#include <functional>
+#include <string>
+#include <memory>
+
+namespace spdlog
+{
+
+namespace details
+{
+class async_log_helper;
+}
+
+class async_logger :public logger
+{
+public:
+    template<class It>
+    async_logger(const std::string& name,
+                 const It& begin,
+                 const It& end,
+                 size_t queue_size,
+                 const async_overflow_policy overflow_policy =  async_overflow_policy::block_retry,
+                 const std::function<void()>& worker_warmup_cb = nullptr,
+                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds{0});
+
+    async_logger(const std::string& logger_name,
+                 sinks_init_list sinks,
+                 size_t queue_size,
+                 const async_overflow_policy overflow_policy = async_overflow_policy::block_retry,
+                 const std::function<void()>& worker_warmup_cb = nullptr,
+                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds{0});
+
+    async_logger(const std::string& logger_name,
+                 sink_ptr single_sink,
+                 size_t queue_size,
+                 const async_overflow_policy overflow_policy =  async_overflow_policy::block_retry,
+                 const std::function<void()>& worker_warmup_cb = nullptr,
+                 const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds{0});
+
+
+    void flush() override;
+protected:
+    void _log_msg(details::log_msg& msg) override;
+    void _set_formatter(spdlog::formatter_ptr msg_formatter) override;
+    void _set_pattern(const std::string& pattern) override;
+
+private:
+    std::unique_ptr<details::async_log_helper> _async_log_helper;
+};
+}
+
+
+#include <spdlog/details/async_logger_impl.h>
+

src/spdlog/common.h

@@ -0,0 +1,130 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+
+#include <string>
+#include <initializer_list>
+#include <chrono>
+#include <memory>
+#include <atomic>
+#include <exception>
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+#include <codecvt>
+#include <locale>
+#endif
+
+#include <spdlog/details/null_mutex.h>
+
+//visual studio does not support noexcept yet
+#ifndef _MSC_VER
+#define SPDLOG_NOEXCEPT noexcept
+#else
+#define SPDLOG_NOEXCEPT throw()
+#endif
+
+namespace spdlog
+{
+
+class formatter;
+
+namespace sinks
+{
+class sink;
+}
+
+// Common types across the lib
+using log_clock = std::chrono::system_clock;
+using sink_ptr = std::shared_ptr < sinks::sink >;
+using sinks_init_list = std::initializer_list < sink_ptr >;
+using formatter_ptr = std::shared_ptr<spdlog::formatter>;
+#if defined(SPDLOG_NO_ATOMIC_LEVELS)
+using level_t = details::null_atomic_int;
+#else
+using level_t = std::atomic_int;
+#endif
+
+//Log level enum
+namespace level
+{
+typedef enum
+{
+    trace = 0,
+    debug = 1,
+    info = 2,
+    notice = 3,
+    warn = 4,
+    err = 5,
+    critical = 6,
+    alert = 7,
+    emerg = 8,
+    off = 9
+} level_enum;
+
+static const char* level_names[] { "trace", "debug", "info", "notice", "warning", "error", "critical", "alert", "emerg", "off"};
+
+static const char* short_level_names[] { "T", "D", "I", "N", "W", "E", "C", "A", "M", "O"};
+
+inline const char* to_str(spdlog::level::level_enum l)
+{
+    return level_names[l];
+}
+
+inline const char* to_short_str(spdlog::level::level_enum l)
+{
+    return short_level_names[l];
+}
+} //level
+
+
+//
+// Async overflow policy - block by default.
+//
+enum class async_overflow_policy
+{
+    block_retry, // Block / yield / sleep until message can be enqueued
+    discard_log_msg // Discard the message it enqueue fails
+};
+
+
+//
+// Log exception
+//
+class spdlog_ex : public std::exception
+{
+public:
+    spdlog_ex(const std::string& msg) :_msg(msg) {}
+    const char* what() const SPDLOG_NOEXCEPT override
+    {
+        return _msg.c_str();
+    }
+private:
+    std::string _msg;
+
+};
+
+//
+// wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)
+//
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+#define SPDLOG_FILENAME_T(s) L ## s
+using filename_t = std::wstring;
+inline std::string filename_to_str(const filename_t& filename)
+{
+    std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> c;
+    return c.to_bytes(filename);
+}
+#else
+#define SPDLOG_FILENAME_T(s) s
+using filename_t = std::string;
+
+inline std::string filename_to_str(const filename_t& filename)
+{
+    return filename;
+}
+#endif
+
+} //spdlog

src/spdlog/details/async_log_helper.h

@@ -0,0 +1,368 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+// async log helper :
+// Process logs asynchronously using a back thread.
+//
+// If the internal queue of log messages reaches its max size,
+// then the client call will block until there is more room.
+//
+// If the back thread throws during logging, a spdlog::spdlog_ex exception
+// will be thrown in client's thread when tries to log the next message
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <spdlog/sinks/sink.h>
+#include <spdlog/details/mpmc_bounded_q.h>
+#include <spdlog/details/log_msg.h>
+#include <spdlog/details/os.h>
+#include <spdlog/formatter.h>
+
+#include <chrono>
+#include <exception>
+#include <functional>
+#include <memory>
+#include <string>
+#include <thread>
+#include <utility>
+#include <vector>
+
+namespace spdlog
+{
+namespace details
+{
+
+class async_log_helper
+{
+    // Async msg to move to/from the queue
+    // Movable only. should never be copied
+    enum class async_msg_type
+    {
+        log,
+        flush,
+        terminate
+    };
+    struct async_msg
+    {
+        std::string logger_name;
+        level::level_enum level;
+        log_clock::time_point time;
+        size_t thread_id;
+        std::string txt;
+        async_msg_type msg_type;
+
+        async_msg() = default;
+        ~async_msg() = default;
+
+
+async_msg(async_msg&& other) SPDLOG_NOEXCEPT:
+        logger_name(std::move(other.logger_name)),
+                    level(std::move(other.level)),
+                    time(std::move(other.time)),
+                    txt(std::move(other.txt)),
+                    msg_type(std::move(other.msg_type))
+        {}
+
+        async_msg(async_msg_type m_type) :msg_type(m_type)
+        {};
+
+        async_msg& operator=(async_msg&& other) SPDLOG_NOEXCEPT
+        {
+            logger_name = std::move(other.logger_name);
+            level = other.level;
+            time = std::move(other.time);
+            thread_id = other.thread_id;
+            txt = std::move(other.txt);
+            msg_type = other.msg_type;
+            return *this;
+        }
+
+        // never copy or assign. should only be moved..
+        async_msg(const async_msg&) = delete;
+        async_msg& operator=(async_msg& other) = delete;
+
+        // construct from log_msg
+        async_msg(const details::log_msg& m) :
+            logger_name(m.logger_name),
+            level(m.level),
+            time(m.time),
+            thread_id(m.thread_id),
+            txt(m.raw.data(), m.raw.size()),
+            msg_type(async_msg_type::log)
+        {}
+
+
+
+        // copy into log_msg
+        void fill_log_msg(log_msg &msg)
+        {
+            msg.clear();
+            msg.logger_name = logger_name;
+            msg.level = level;
+            msg.time = time;
+            msg.thread_id = thread_id;
+            msg.raw << txt;
+        }
+    };
+
+public:
+
+    using item_type = async_msg;
+    using q_type = details::mpmc_bounded_queue<item_type>;
+
+    using clock = std::chrono::steady_clock;
+
+
+    async_log_helper(formatter_ptr formatter,
+                     const std::vector<sink_ptr>& sinks,
+                     size_t queue_size,
+                     const async_overflow_policy overflow_policy = async_overflow_policy::block_retry,
+                     const std::function<void()>& worker_warmup_cb = nullptr,
+                     const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds{0});
+
+    void log(const details::log_msg& msg);
+
+    // stop logging and join the back thread
+    ~async_log_helper();
+
+    void set_formatter(formatter_ptr);
+
+    void flush();
+
+
+private:
+    formatter_ptr _formatter;
+    std::vector<std::shared_ptr<sinks::sink>> _sinks;
+
+    // queue of messages to log
+    q_type _q;
+
+    bool _flush_requested;
+
+    bool _terminate_requested;
+
+
+    // last exception thrown from the worker thread
+    std::shared_ptr<spdlog_ex> _last_workerthread_ex;
+
+    // overflow policy
+    const async_overflow_policy _overflow_policy;
+
+    // worker thread warmup callback - one can set thread priority, affinity, etc
+    const std::function<void()> _worker_warmup_cb;
+
+    // auto periodic sink flush parameter
+    const std::chrono::milliseconds _flush_interval_ms;
+
+    // worker thread
+    std::thread _worker_thread;
+
+    void push_msg(async_msg&& new_msg);
+    // throw last worker thread exception or if worker thread is not active
+
+    void throw_if_bad_worker();
+
+    // worker thread main loop
+    void worker_loop();
+
+    // pop next message from the queue and process it. will set the last_pop to the pop time
+    // return false if termination of the queue is required
+    bool process_next_msg(log_clock::time_point& last_pop, log_clock::time_point& last_flush);
+
+    void handle_flush_interval(log_clock::time_point& now, log_clock::time_point& last_flush);
+
+    // sleep,yield or return immediatly using the time passed since last message as a hint
+    static void sleep_or_yield(const spdlog::log_clock::time_point& now, const log_clock::time_point& last_op_time);
+
+};
+}
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// async_sink class implementation
+///////////////////////////////////////////////////////////////////////////////
+inline spdlog::details::async_log_helper::async_log_helper(
+    formatter_ptr formatter,
+    const std::vector<sink_ptr>& sinks,
+    size_t queue_size,
+    const async_overflow_policy overflow_policy,
+    const std::function<void()>& worker_warmup_cb,
+    const std::chrono::milliseconds& flush_interval_ms):
+    _formatter(formatter),
+    _sinks(sinks),
+    _q(queue_size),
+    _flush_requested(false),
+    _terminate_requested(false),
+    _overflow_policy(overflow_policy),
+    _worker_warmup_cb(worker_warmup_cb),
+    _flush_interval_ms(flush_interval_ms),
+    _worker_thread(&async_log_helper::worker_loop, this)
+{}
+
+// Send to the worker thread termination message(level=off)
+// and wait for it to finish gracefully
+inline spdlog::details::async_log_helper::~async_log_helper()
+{
+    try
+    {
+        push_msg(async_msg(async_msg_type::terminate));
+        _worker_thread.join();
+    }
+    catch (...) // don't crash in destructor
+    {}
+}
+
+
+//Try to push and block until succeeded
+inline void spdlog::details::async_log_helper::log(const details::log_msg& msg)
+{
+    push_msg(async_msg(msg));
+
+
+}
+
+//Try to push and block until succeeded
+inline void spdlog::details::async_log_helper::push_msg(details::async_log_helper::async_msg&& new_msg)
+{
+    throw_if_bad_worker();
+    if (!_q.enqueue(std::move(new_msg)) && _overflow_policy != async_overflow_policy::discard_log_msg)
+    {
+        auto last_op_time = details::os::now();
+        auto now = last_op_time;
+        do
+        {
+            now = details::os::now();
+            sleep_or_yield(now, last_op_time);
+        }
+        while (!_q.enqueue(std::move(new_msg)));
+    }
+
+}
+
+inline void spdlog::details::async_log_helper::flush()
+{
+    push_msg(async_msg(async_msg_type::flush));
+}
+
+inline void spdlog::details::async_log_helper::worker_loop()
+{
+    try
+    {
+        if (_worker_warmup_cb) _worker_warmup_cb();
+        auto last_pop = details::os::now();
+        auto last_flush = last_pop;
+        while(process_next_msg(last_pop, last_flush));
+    }
+    catch (const std::exception& ex)
+    {
+        _last_workerthread_ex = std::make_shared<spdlog_ex>(std::string("async_logger worker thread exception: ") + ex.what());
+    }
+    catch (...)
+    {
+        _last_workerthread_ex = std::make_shared<spdlog_ex>("async_logger worker thread exception");
+    }
+}
+
+// process next message in the queue
+// return true if this thread should still be active (no msg with level::off was received)
+inline bool spdlog::details::async_log_helper::process_next_msg(log_clock::time_point& last_pop, log_clock::time_point& last_flush)
+{
+
+    async_msg incoming_async_msg;
+    log_msg incoming_log_msg;
+
+    if (_q.dequeue(incoming_async_msg))
+    {
+        last_pop = details::os::now();
+        switch (incoming_async_msg.msg_type)
+        {
+        case async_msg_type::flush:
+            _flush_requested = true;
+            break;
+
+        case async_msg_type::terminate:
+            _flush_requested = true;
+            _terminate_requested = true;
+            break;
+
+        default:
+            incoming_async_msg.fill_log_msg(incoming_log_msg);
+            _formatter->format(incoming_log_msg);
+            for (auto &s : _sinks)
+                s->log(incoming_log_msg);
+        }
+        return true;
+    }
+
+    // Handle empty queue..
+    // This is the only place where the queue can terminate or flush to avoid losing messages already in the queue
+    else
+    {
+        auto now = details::os::now();
+        handle_flush_interval(now, last_flush);
+        sleep_or_yield(now, last_pop);
+        return !_terminate_requested;
+
+    }
+}
+
+inline void spdlog::details::async_log_helper::handle_flush_interval(log_clock::time_point& now, log_clock::time_point& last_flush)
+{
+    auto should_flush = _flush_requested || (_flush_interval_ms != std::chrono::milliseconds::zero() && now - last_flush >= _flush_interval_ms);
+    if (should_flush)
+    {
+        for (auto &s : _sinks)
+            s->flush();
+        now = last_flush = details::os::now();
+        _flush_requested = false;
+    }
+}
+inline void spdlog::details::async_log_helper::set_formatter(formatter_ptr msg_formatter)
+{
+    _formatter = msg_formatter;
+}
+
+
+// sleep,yield or return immediatly using the time passed since last message as a hint
+inline void spdlog::details::async_log_helper::sleep_or_yield(const spdlog::log_clock::time_point& now, const spdlog::log_clock::time_point& last_op_time)
+{
+    using std::chrono::milliseconds;
+    using namespace std::this_thread;
+
+    auto time_since_op = now - last_op_time;
+
+    // spin upto 1 ms
+    if (time_since_op <= milliseconds(1))
+        return;
+
+    // yield upto 10ms
+    if (time_since_op <= milliseconds(10))
+        return yield();
+
+
+    // sleep for half of duration since last op
+    if (time_since_op <= milliseconds(100))
+        return sleep_for(time_since_op / 2);
+
+    return sleep_for(milliseconds(100));
+}
+
+// throw if the worker thread threw an exception or not active
+inline void spdlog::details::async_log_helper::throw_if_bad_worker()
+{
+    if (_last_workerthread_ex)
+    {
+        auto ex = std::move(_last_workerthread_ex);
+        throw *ex;
+    }
+}
+
+
+
+
+
+
+

src/spdlog/details/async_logger_impl.h

@@ -0,0 +1,74 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Async Logger implementation
+// Use an async_sink (queue per logger) to perform the logging in a worker thread
+
+#include <spdlog/details/async_log_helper.h>
+#include <spdlog/async_logger.h>
+
+#include <string>
+#include <functional>
+#include <chrono>
+#include <memory>
+
+template<class It>
+inline spdlog::async_logger::async_logger(const std::string& logger_name,
+        const It& begin,
+        const It& end,
+        size_t queue_size,
+        const  async_overflow_policy overflow_policy,
+        const std::function<void()>& worker_warmup_cb,
+        const std::chrono::milliseconds& flush_interval_ms) :
+    logger(logger_name, begin, end),
+    _async_log_helper(new details::async_log_helper(_formatter, _sinks, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms))
+{
+}
+
+inline spdlog::async_logger::async_logger(const std::string& logger_name,
+        sinks_init_list sinks,
+        size_t queue_size,
+        const  async_overflow_policy overflow_policy,
+        const std::function<void()>& worker_warmup_cb,
+        const std::chrono::milliseconds& flush_interval_ms) :
+    async_logger(logger_name, sinks.begin(), sinks.end(), queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms) {}
+
+inline spdlog::async_logger::async_logger(const std::string& logger_name,
+        sink_ptr single_sink,
+        size_t queue_size,
+        const  async_overflow_policy overflow_policy,
+        const std::function<void()>& worker_warmup_cb,
+        const std::chrono::milliseconds& flush_interval_ms) :
+    async_logger(logger_name,
+{
+    single_sink
+}, queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms) {}
+
+
+inline void spdlog::async_logger::flush()
+{
+
+    _async_log_helper->flush();
+}
+
+inline void spdlog::async_logger::_set_formatter(spdlog::formatter_ptr msg_formatter)
+{
+    _formatter = msg_formatter;
+    _async_log_helper->set_formatter(_formatter);
+}
+
+inline void spdlog::async_logger::_set_pattern(const std::string& pattern)
+{
+    _formatter = std::make_shared<pattern_formatter>(pattern);
+    _async_log_helper->set_formatter(_formatter);
+}
+
+
+inline void spdlog::async_logger::_log_msg(details::log_msg& msg)
+{
+    _async_log_helper->log(msg);
+}

src/spdlog/details/file_helper.h

@@ -0,0 +1,142 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Helper class for file sink
+// When failing to open a file, retry several times(5) with small delay between the tries(10 ms)
+// Can be set to auto flush on every line
+// Throw spdlog_ex exception on errors
+
+#include <spdlog/details/os.h>
+#include <spdlog/details/log_msg.h>
+
+#include <chrono>
+#include <cstdio>
+#include <string>
+#include <thread>
+
+namespace spdlog
+{
+namespace details
+{
+
+class file_helper
+{
+public:
+    const int open_tries = 5;
+    const int open_interval = 10;
+
+    explicit file_helper(bool force_flush) :
+        _fd(nullptr),
+        _force_flush(force_flush)
+    {}
+
+    file_helper(const file_helper&) = delete;
+    file_helper& operator=(const file_helper&) = delete;
+
+    ~file_helper()
+    {
+        close();
+    }
+
+
+    void open(const filename_t& fname, bool truncate = false)
+    {
+
+        close();
+        auto *mode = truncate ? SPDLOG_FILENAME_T("wb") : SPDLOG_FILENAME_T("ab");
+        _filename = fname;
+        for (int tries = 0; tries < open_tries; ++tries)
+        {
+            if (!os::fopen_s(&_fd, fname, mode))
+                return;
+
+            std::this_thread::sleep_for(std::chrono::milliseconds(open_interval));
+        }
+
+        throw spdlog_ex("Failed opening file " + filename_to_str(_filename) + " for writing");
+    }
+
+    void reopen(bool truncate)
+    {
+        if (_filename.empty())
+            throw spdlog_ex("Failed re opening file - was not opened before");
+        open(_filename, truncate);
+
+    }
+
+    void flush()
+    {
+        std::fflush(_fd);
+    }
+
+    void close()
+    {
+        if (_fd)
+        {
+            std::fclose(_fd);
+            _fd = nullptr;
+        }
+    }
+
+    void write(const log_msg& msg)
+    {
+
+        size_t msg_size = msg.formatted.size();
+        auto data = msg.formatted.data();
+        if (std::fwrite(data, 1, msg_size, _fd) != msg_size)
+            throw spdlog_ex("Failed writing to file " + filename_to_str(_filename));
+
+        if (_force_flush)
+            std::fflush(_fd);
+
+    }
+
+    long size()
+    {
+        if (!_fd)
+            throw spdlog_ex("Cannot use size() on closed file " + filename_to_str(_filename));
+
+        auto pos = ftell(_fd);
+        if (fseek(_fd, 0, SEEK_END) != 0)
+            throw spdlog_ex("fseek failed on file " + filename_to_str(_filename));
+
+        auto file_size = ftell(_fd);
+
+        if(fseek(_fd, pos, SEEK_SET) !=0)
+            throw spdlog_ex("fseek failed on file " + filename_to_str(_filename));
+
+        if (file_size == -1)
+            throw spdlog_ex("ftell failed on file " + filename_to_str(_filename));
+
+
+        return file_size;
+
+
+    }
+
+    const filename_t& filename() const
+    {
+        return _filename;
+    }
+
+    static bool file_exists(const filename_t& name)
+    {
+
+        return os::file_exists(name);
+    }
+
+
+
+private:
+    FILE* _fd;
+    filename_t _filename;
+    bool _force_flush;
+
+
+};
+}
+}

src/spdlog/details/line_logger_fwd.h

@@ -0,0 +1,78 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+#pragma once
+
+#include <spdlog/common.h>
+#include <spdlog/details/log_msg.h>
+
+#include <string>
+
+// Line logger class - aggregates operator<< calls to fast ostream
+// and logs upon destruction
+
+namespace spdlog
+{
+
+// Forward declaration
+class logger;
+
+namespace details
+{
+class line_logger
+{
+public:
+    line_logger(logger* callback_logger, level::level_enum msg_level, bool enabled);
+
+    // No copy intended. Only move
+    line_logger(const line_logger& other) = delete;
+    line_logger& operator=(const line_logger&) = delete;
+    line_logger& operator=(line_logger&&) = delete;
+
+
+    line_logger(line_logger&& other);
+
+    //Log the log message using the callback logger
+    ~line_logger();
+
+    //
+    // Support for format string with variadic args
+    //
+
+
+    void write(const char* what);
+
+    template <typename... Args>
+    void write(const char* fmt, const Args&... args);
+
+    //
+    // Support for operator<<
+    //
+    line_logger& operator<<(const char* what);
+    line_logger& operator<<(const std::string& what);
+    line_logger& operator<<(int what);
+    line_logger& operator<<(unsigned int what);
+    line_logger& operator<<(long what);
+    line_logger& operator<<(unsigned long what);
+    line_logger& operator<<(long long what);
+    line_logger& operator<<(unsigned long long what);
+    line_logger& operator<<(double what);
+    line_logger& operator<<(long double what);
+    line_logger& operator<<(float what);
+    line_logger& operator<<(char what);
+    //Support user types which implements operator<<
+    template<typename T>
+    line_logger& operator<<(const T& what);
+
+    void disable();
+    bool is_enabled() const;
+
+private:
+    logger* _callback_logger;
+    log_msg _log_msg;
+    bool _enabled;
+};
+} //Namespace details
+} // Namespace spdlog
+

src/spdlog/details/line_logger_impl.h

@@ -0,0 +1,185 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+#pragma once
+#include <type_traits>
+
+#include <spdlog/details/line_logger_fwd.h>
+#include <spdlog/common.h>
+#include <spdlog/logger.h>
+
+#include <string>
+#include <utility>
+
+// Line logger class - aggregates operator<< calls to fast ostream
+// and logs upon destruction
+
+inline spdlog::details::line_logger::line_logger(logger* callback_logger, level::level_enum msg_level, bool enabled):
+    _callback_logger(callback_logger),
+    _log_msg(msg_level),
+    _enabled(enabled)
+{}
+
+inline spdlog::details::line_logger::line_logger(line_logger&& other) :
+    _callback_logger(other._callback_logger),
+    _log_msg(std::move(other._log_msg)),
+    _enabled(other._enabled)
+{
+    other.disable();
+}
+
+//Log the log message using the callback logger
+inline spdlog::details::line_logger::~line_logger()
+{
+    if (_enabled)
+    {
+#ifndef SPDLOG_NO_NAME
+        _log_msg.logger_name = _callback_logger->name();
+#endif
+#ifndef SPDLOG_NO_DATETIME
+        _log_msg.time = os::now();
+#endif
+
+#ifndef SPDLOG_NO_THREAD_ID
+        _log_msg.thread_id = os::thread_id();
+#endif
+        _callback_logger->_log_msg(_log_msg);
+    }
+}
+
+//
+// Support for format string with variadic args
+//
+
+
+inline void spdlog::details::line_logger::write(const char* what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+}
+
+template <typename... Args>
+inline void spdlog::details::line_logger::write(const char* fmt, const Args&... args)
+{
+    if (!_enabled)
+        return;
+    try
+    {
+        _log_msg.raw.write(fmt, args...);
+    }
+    catch (const fmt::FormatError& e)
+    {
+        throw spdlog_ex(fmt::format("formatting error while processing format string '{}': {}", fmt, e.what()));
+    }
+}
+
+
+//
+// Support for operator<<
+//
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(const char* what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(const std::string& what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(int what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(unsigned int what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(long what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(unsigned long what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(long long what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(unsigned long long what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(double what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(long double what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(float what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(char what)
+{
+    if (_enabled)
+        _log_msg.raw << what;
+    return *this;
+}
+
+//Support user types which implements operator<<
+template<typename T>
+inline spdlog::details::line_logger& spdlog::details::line_logger::operator<<(const T& what)
+{
+    if (_enabled)
+        _log_msg.raw.write("{}", what);
+    return *this;
+}
+
+
+inline void spdlog::details::line_logger::disable()
+{
+    _enabled = false;
+}
+
+inline bool spdlog::details::line_logger::is_enabled() const
+{
+    return _enabled;
+}
+

src/spdlog/details/log_msg.h

@@ -0,0 +1,81 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <spdlog/details/format.h>
+
+#include <string>
+#include <utility>
+
+namespace spdlog
+{
+namespace details
+{
+struct log_msg
+{
+    log_msg() = default;
+    log_msg(level::level_enum l):
+        logger_name(),
+        level(l),
+        raw(),
+        formatted() {}
+
+
+    log_msg(const log_msg& other) :
+        logger_name(other.logger_name),
+        level(other.level),
+        time(other.time),
+        thread_id(other.thread_id)
+    {
+        if (other.raw.size())
+            raw << fmt::BasicStringRef<char>(other.raw.data(), other.raw.size());
+        if (other.formatted.size())
+            formatted << fmt::BasicStringRef<char>(other.formatted.data(), other.formatted.size());
+    }
+
+    log_msg(log_msg&& other) :
+        logger_name(std::move(other.logger_name)),
+        level(other.level),
+        time(std::move(other.time)),
+        thread_id(other.thread_id),
+        raw(std::move(other.raw)),
+        formatted(std::move(other.formatted))
+    {
+        other.clear();
+    }
+
+    log_msg& operator=(log_msg&& other)
+    {
+        if (this == &other)
+            return *this;
+
+        logger_name = std::move(other.logger_name);
+        level = other.level;
+        time = std::move(other.time);
+        thread_id = other.thread_id;
+        raw = std::move(other.raw);
+        formatted = std::move(other.formatted);
+        other.clear();
+        return *this;
+    }
+
+    void clear()
+    {
+        level = level::off;
+        raw.clear();
+        formatted.clear();
+    }
+
+    std::string logger_name;
+    level::level_enum level;
+    log_clock::time_point time;
+    size_t thread_id;
+    fmt::MemoryWriter raw;
+    fmt::MemoryWriter formatted;
+};
+}
+}

src/spdlog/details/logger_impl.h

@@ -0,0 +1,302 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/logger.h>
+
+#include <memory>
+#include <string>
+
+// create logger with given name, sinks and the default pattern formatter
+// all other ctors will call this one
+template<class It>
+inline spdlog::logger::logger(const std::string& logger_name, const It& begin, const It& end) :
+    _name(logger_name),
+    _sinks(begin, end),
+    _formatter(std::make_shared<pattern_formatter>("%+"))
+{
+
+    // no support under vs2013 for member initialization for std::atomic
+    _level = level::info;
+}
+
+// ctor with sinks as init list
+inline spdlog::logger::logger(const std::string& logger_name, sinks_init_list sinks_list) :
+    logger(logger_name, sinks_list.begin(), sinks_list.end()) {}
+
+
+// ctor with single sink
+inline spdlog::logger::logger(const std::string& logger_name, spdlog::sink_ptr single_sink) :
+    logger(logger_name,
+{
+    single_sink
+}) {}
+
+
+inline spdlog::logger::~logger() = default;
+
+
+inline void spdlog::logger::set_formatter(spdlog::formatter_ptr msg_formatter)
+{
+    _set_formatter(msg_formatter);
+}
+
+inline void spdlog::logger::set_pattern(const std::string& pattern)
+{
+    _set_pattern(pattern);
+}
+
+//
+// log only if given level>=logger's log level
+//
+
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::_log_if_enabled(level::level_enum lvl, const char* fmt, const Args&... args)
+{
+    bool msg_enabled = should_log(lvl);
+    details::line_logger l(this, lvl, msg_enabled);
+    l.write(fmt, args...);
+    return l;
+}
+
+inline spdlog::details::line_logger spdlog::logger::_log_if_enabled(level::level_enum lvl)
+{
+    return details::line_logger(this, lvl, should_log(lvl));
+}
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::_log_if_enabled(level::level_enum lvl, const T& msg)
+{
+    bool msg_enabled = should_log(lvl);
+    details::line_logger l(this, lvl, msg_enabled);
+    l << msg;
+    return l;
+}
+
+//
+// logger.info(cppformat_string, arg1, arg2, arg3, ...) call style
+//
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::trace(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::trace, fmt, args...);
+}
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::debug(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::debug, fmt, args...);
+}
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::info(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::info, fmt, args...);
+}
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::notice(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::notice, fmt, args...);
+}
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::warn(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::warn, fmt, args...);
+}
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::error(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::err, fmt, args...);
+}
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::critical(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::critical, fmt, args...);
+}
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::alert(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::alert, fmt, args...);
+}
+
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::emerg(const char* fmt, const Args&... args)
+{
+    return _log_if_enabled(level::emerg, fmt, args...);
+}
+
+//
+// logger.info(msg) << ".." call style
+//
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::trace(const T& msg)
+{
+    return _log_if_enabled(level::trace, msg);
+}
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::debug(const T& msg)
+{
+    return _log_if_enabled(level::debug, msg);
+}
+
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::info(const T& msg)
+{
+    return _log_if_enabled(level::info, msg);
+}
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::notice(const T& msg)
+{
+    return _log_if_enabled(level::notice, msg);
+}
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::warn(const T& msg)
+{
+    return _log_if_enabled(level::warn, msg);
+}
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::error(const T& msg)
+{
+    return _log_if_enabled(level::err, msg);
+}
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::critical(const T& msg)
+{
+    return _log_if_enabled(level::critical, msg);
+}
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::alert(const T& msg)
+{
+    return _log_if_enabled(level::alert, msg);
+}
+
+template<typename T>
+inline spdlog::details::line_logger spdlog::logger::emerg(const T& msg)
+{
+    return _log_if_enabled(level::emerg, msg);
+}
+
+
+
+
+//
+// logger.info() << ".." call  style
+//
+inline spdlog::details::line_logger spdlog::logger::trace()
+{
+    return _log_if_enabled(level::trace);
+}
+
+inline spdlog::details::line_logger spdlog::logger::debug()
+{
+    return _log_if_enabled(level::debug);
+}
+
+inline spdlog::details::line_logger spdlog::logger::info()
+{
+    return _log_if_enabled(level::info);
+}
+
+inline spdlog::details::line_logger spdlog::logger::notice()
+{
+    return _log_if_enabled(level::notice);
+}
+
+inline spdlog::details::line_logger spdlog::logger::warn()
+{
+    return _log_if_enabled(level::warn);
+}
+
+inline spdlog::details::line_logger spdlog::logger::error()
+{
+    return _log_if_enabled(level::err);
+}
+
+inline spdlog::details::line_logger spdlog::logger::critical()
+{
+    return _log_if_enabled(level::critical);
+}
+
+inline spdlog::details::line_logger spdlog::logger::alert()
+{
+    return _log_if_enabled(level::alert);
+}
+
+inline spdlog::details::line_logger spdlog::logger::emerg()
+{
+    return _log_if_enabled(level::emerg);
+}
+
+
+// always log, no matter what is the actual logger's log level
+template <typename... Args>
+inline spdlog::details::line_logger spdlog::logger::force_log(level::level_enum lvl, const char* fmt, const Args&... args)
+{
+    details::line_logger l(this, lvl, true);
+    l.write(fmt, args...);
+    return l;
+}
+
+//
+// name and level
+//
+inline const std::string& spdlog::logger::name() const
+{
+    return _name;
+}
+
+inline void spdlog::logger::set_level(spdlog::level::level_enum log_level)
+{
+    _level.store(log_level);
+}
+
+inline spdlog::level::level_enum spdlog::logger::level() const
+{
+    return static_cast<spdlog::level::level_enum>(_level.load(std::memory_order_relaxed));
+}
+
+inline bool spdlog::logger::should_log(spdlog::level::level_enum msg_level) const
+{
+    return msg_level >= _level.load(std::memory_order_relaxed);
+}
+
+//
+// protected virtual called at end of each user log call (if enabled) by the line_logger
+//
+inline void spdlog::logger::_log_msg(details::log_msg& msg)
+{
+    _formatter->format(msg);
+    for (auto &sink : _sinks)
+        sink->log(msg);
+}
+
+inline void spdlog::logger::_set_pattern(const std::string& pattern)
+{
+    _formatter = std::make_shared<pattern_formatter>(pattern);
+}
+inline void spdlog::logger::_set_formatter(formatter_ptr msg_formatter)
+{
+    _formatter = msg_formatter;
+}
+
+inline void spdlog::logger::flush()
+{
+    for (auto& sink : _sinks)
+        sink->flush();
+}

src/spdlog/details/mpmc_bounded_q.h

@@ -0,0 +1,159 @@
+/*
+A modified version of Bounded MPMC queue by Dmitry Vyukov.
+
+Original code from:
+http://www.1024cores.net/home/lock-free-algorithms/queues/bounded-mpmc-queue
+
+licensed by Dmitry Vyukov under the terms below:
+
+Simplified BSD license
+
+Copyright (c) 2010-2011 Dmitry Vyukov. All rights reserved.
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+1. Redistributions of source code must retain the above copyright notice, this list of
+conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list
+of conditions and the following disclaimer in the documentation and/or other materials
+provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY DMITRY VYUKOV "AS IS" AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+SHALL DMITRY VYUKOV OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation are those of the authors and
+should not be interpreted as representing official policies, either expressed or implied, of Dmitry Vyukov.
+*/
+
+/*
+The code in its current form adds the license below:
+
+Copyright(c) 2015 Gabi Melman.
+Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+*/
+
+#pragma once
+
+#include <spdlog/common.h>
+
+#include <atomic>
+#include <utility>
+
+namespace spdlog
+{
+namespace details
+{
+
+template<typename T>
+class mpmc_bounded_queue
+{
+public:
+
+    using item_type = T;
+    mpmc_bounded_queue(size_t buffer_size)
+        : buffer_(new cell_t [buffer_size]),
+          buffer_mask_(buffer_size - 1)
+    {
+        //queue size must be power of two
+        if(!((buffer_size >= 2) && ((buffer_size & (buffer_size - 1)) == 0)))
+            throw spdlog_ex("async logger queue size must be power of two");
+
+        for (size_t i = 0; i != buffer_size; i += 1)
+            buffer_[i].sequence_.store(i, std::memory_order_relaxed);
+        enqueue_pos_.store(0, std::memory_order_relaxed);
+        dequeue_pos_.store(0, std::memory_order_relaxed);
+    }
+
+    ~mpmc_bounded_queue()
+    {
+        delete [] buffer_;
+    }
+
+
+    bool enqueue(T&& data)
+    {
+        cell_t* cell;
+        size_t pos = enqueue_pos_.load(std::memory_order_relaxed);
+        for (;;)
+        {
+            cell = &buffer_[pos & buffer_mask_];
+            size_t seq = cell->sequence_.load(std::memory_order_acquire);
+            intptr_t dif = (intptr_t)seq - (intptr_t)pos;
+            if (dif == 0)
+            {
+                if (enqueue_pos_.compare_exchange_weak(pos, pos + 1, std::memory_order_relaxed))
+                    break;
+            }
+            else if (dif < 0)
+            {
+                return false;
+            }
+            else
+            {
+                pos = enqueue_pos_.load(std::memory_order_relaxed);
+            }
+        }
+        cell->data_ = std::move(data);
+        cell->sequence_.store(pos + 1, std::memory_order_release);
+        return true;
+    }
+
+    bool dequeue(T& data)
+    {
+        cell_t* cell;
+        size_t pos = dequeue_pos_.load(std::memory_order_relaxed);
+        for (;;)
+        {
+            cell = &buffer_[pos & buffer_mask_];
+            size_t seq =
+                cell->sequence_.load(std::memory_order_acquire);
+            intptr_t dif = (intptr_t)seq - (intptr_t)(pos + 1);
+            if (dif == 0)
+            {
+                if (dequeue_pos_.compare_exchange_weak(pos, pos + 1, std::memory_order_relaxed))
+                    break;
+            }
+            else if (dif < 0)
+                return false;
+            else
+                pos = dequeue_pos_.load(std::memory_order_relaxed);
+        }
+        data = std::move(cell->data_);
+        cell->sequence_.store(pos + buffer_mask_ + 1, std::memory_order_release);
+        return true;
+    }
+
+private:
+    struct cell_t
+    {
+        std::atomic<size_t>   sequence_;
+        T                     data_;
+    };
+
+    static size_t const     cacheline_size = 64;
+    typedef char            cacheline_pad_t [cacheline_size];
+
+    cacheline_pad_t         pad0_;
+    cell_t* const           buffer_;
+    size_t const            buffer_mask_;
+    cacheline_pad_t         pad1_;
+    std::atomic<size_t>     enqueue_pos_;
+    cacheline_pad_t         pad2_;
+    std::atomic<size_t>     dequeue_pos_;
+    cacheline_pad_t         pad3_;
+
+    mpmc_bounded_queue(mpmc_bounded_queue const&);
+    void operator = (mpmc_bounded_queue const&);
+};
+
+} // ns details
+} // ns spdlog

src/spdlog/details/null_mutex.h

@@ -0,0 +1,45 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <atomic>
+// null, no cost dummy "mutex" and dummy "atomic" int
+
+namespace spdlog
+{
+namespace details
+{
+struct null_mutex
+{
+    void lock() {}
+    void unlock() {}
+    bool try_lock()
+    {
+        return true;
+    }
+};
+
+struct null_atomic_int
+{
+    int value;
+    null_atomic_int() = default;
+
+    null_atomic_int(int val):value(val)
+    {}
+
+    int load(std::memory_order) const
+    {
+        return value;
+    }
+
+    void store(int val)
+    {
+        value = val;
+    }
+};
+
+}
+}

src/spdlog/details/os.h

@@ -0,0 +1,246 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+#pragma once
+
+#include <spdlog/common.h>
+
+#include <cstdio>
+#include <ctime>
+#include <functional>
+#include <string>
+
+#ifdef _WIN32
+
+#ifndef NOMINMAX
+#define NOMINMAX //prevent windows redefining min/max
+#endif
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+
+#ifdef __MINGW32__
+#include <share.h>
+#endif
+
+#elif __linux__
+#include <sys/syscall.h> //Use gettid() syscall under linux to get thread id
+#include <sys/stat.h>
+#include <unistd.h>
+#include <chrono>
+#else
+#include <thread>
+#endif
+
+namespace spdlog
+{
+namespace details
+{
+namespace os
+{
+
+inline spdlog::log_clock::time_point now()
+{
+
+#if defined __linux__ && defined SPDLOG_CLOCK_COARSE
+    timespec ts;
+    ::clock_gettime(CLOCK_REALTIME_COARSE, &ts);
+    return std::chrono::time_point<log_clock, typename log_clock::duration>(
+               std::chrono::duration_cast<typename log_clock::duration>(
+                   std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec)));
+
+
+#else
+    return log_clock::now();
+#endif
+
+}
+inline std::tm localtime(const std::time_t &time_tt)
+{
+
+#ifdef _WIN32
+    std::tm tm;
+    localtime_s(&tm, &time_tt);
+#else
+    std::tm tm;
+    localtime_r(&time_tt, &tm);
+#endif
+    return tm;
+}
+
+inline std::tm localtime()
+{
+    std::time_t now_t = time(nullptr);
+    return localtime(now_t);
+}
+
+
+inline std::tm gmtime(const std::time_t &time_tt)
+{
+
+#ifdef _WIN32
+    std::tm tm;
+    gmtime_s(&tm, &time_tt);
+#else
+    std::tm tm;
+    gmtime_r(&time_tt, &tm);
+#endif
+    return tm;
+}
+
+inline std::tm gmtime()
+{
+    std::time_t now_t = time(nullptr);
+    return gmtime(now_t);
+}
+inline bool operator==(const std::tm& tm1, const std::tm& tm2)
+{
+    return (tm1.tm_sec == tm2.tm_sec &&
+            tm1.tm_min == tm2.tm_min &&
+            tm1.tm_hour == tm2.tm_hour &&
+            tm1.tm_mday == tm2.tm_mday &&
+            tm1.tm_mon == tm2.tm_mon &&
+            tm1.tm_year == tm2.tm_year &&
+            tm1.tm_isdst == tm2.tm_isdst);
+}
+
+inline bool operator!=(const std::tm& tm1, const std::tm& tm2)
+{
+    return !(tm1 == tm2);
+}
+
+#ifdef _WIN32
+inline const char* eol()
+{
+    return "\r\n";
+}
+#else
+constexpr inline const char* eol()
+{
+    return "\n";
+}
+#endif
+
+#ifdef _WIN32
+inline unsigned short eol_size()
+{
+    return 2;
+}
+#else
+constexpr inline unsigned short eol_size()
+{
+    return 1;
+}
+#endif
+
+//fopen_s on non windows for writing
+inline int fopen_s(FILE** fp, const filename_t& filename, const filename_t& mode)
+{
+#ifdef _WIN32
+#ifdef SPDLOG_WCHAR_FILENAMES
+    *fp = _wfsopen((filename.c_str()), mode.c_str(), _SH_DENYWR);
+#else
+    *fp = _fsopen((filename.c_str()), mode.c_str(), _SH_DENYWR);
+#endif
+    return *fp == nullptr;
+#else
+    *fp = fopen((filename.c_str()), mode.c_str());
+    return *fp == nullptr;
+#endif
+}
+
+inline int remove(const filename_t &filename)
+{
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+    return _wremove(filename.c_str());
+#else
+    return std::remove(filename.c_str());
+#endif
+}
+
+inline int rename(const filename_t& filename1, const filename_t& filename2)
+{
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+    return _wrename(filename1.c_str(), filename2.c_str());
+#else
+    return std::rename(filename1.c_str(), filename2.c_str());
+#endif
+}
+
+
+//Return if file exists
+inline bool file_exists(const filename_t& filename)
+{
+#ifdef _WIN32
+#ifdef SPDLOG_WCHAR_FILENAMES
+    auto attribs = GetFileAttributesW(filename.c_str());
+#else
+    auto attribs = GetFileAttributesA(filename.c_str());
+#endif
+    return (attribs != INVALID_FILE_ATTRIBUTES && !(attribs & FILE_ATTRIBUTE_DIRECTORY));
+#elif __linux__
+    struct stat buffer;
+    return (stat (filename.c_str(), &buffer) == 0);
+#else
+    auto *file = fopen(filename.c_str(), "r");
+    if (file != nullptr)
+    {
+        fclose(file);
+        return true;
+    }
+    return false;
+
+#endif
+}
+
+//Return utc offset in minutes or throw spdlog_ex on failure
+inline int utc_minutes_offset(const std::tm& tm = details::os::localtime())
+{
+
+#ifdef _WIN32
+#if _WIN32_WINNT < _WIN32_WINNT_WS08
+    TIME_ZONE_INFORMATION tzinfo;
+    auto rv = GetTimeZoneInformation(&tzinfo);
+#else
+    DYNAMIC_TIME_ZONE_INFORMATION tzinfo;
+    auto rv = GetDynamicTimeZoneInformation(&tzinfo);
+#endif
+    if (rv == TIME_ZONE_ID_INVALID)
+        throw spdlog::spdlog_ex("Failed getting timezone info. Last error: " + GetLastError());
+
+    int offset = -tzinfo.Bias;
+    if (tm.tm_isdst)
+        offset -= tzinfo.DaylightBias;
+    else
+        offset -= tzinfo.StandardBias;
+    return offset;
+#else
+    return static_cast<int>(tm.tm_gmtoff / 60);
+#endif
+}
+
+//Return current thread id as size_t
+//It exists because the std::this_thread::get_id() is much slower(espcially under VS 2013)
+inline size_t thread_id()
+{
+#ifdef _WIN32
+    return  static_cast<size_t>(::GetCurrentThreadId());
+#elif __linux__
+# if defined(__ANDROID__) && defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
+#  define SYS_gettid __NR_gettid
+# endif
+    return  static_cast<size_t>(syscall(SYS_gettid));
+#else //Default to standard C++11 (OSX and other Unix)
+    return static_cast<size_t>(std::hash<std::thread::id>()(std::this_thread::get_id()));
+#endif
+
+}
+
+} //os
+} //details
+} //spdlog
+
+

src/spdlog/details/pattern_formatter_impl.h

@@ -0,0 +1,628 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/formatter.h>
+#include <spdlog/details/log_msg.h>
+#include <spdlog/details/os.h>
+#include <spdlog/details/format.h>
+
+#include <chrono>
+#include <ctime>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <utility>
+#include <vector>
+
+namespace spdlog
+{
+namespace details
+{
+class flag_formatter
+{
+public:
+    virtual ~flag_formatter() {}
+    virtual void format(details::log_msg& msg, const std::tm& tm_time) = 0;
+};
+
+///////////////////////////////////////////////////////////////////////
+// name & level pattern appenders
+///////////////////////////////////////////////////////////////////////
+namespace
+{
+class name_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << msg.logger_name;
+    }
+};
+}
+
+// log level appender
+class level_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << level::to_str(msg.level);
+    }
+};
+
+// short log level appender
+class short_level_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << level::to_short_str(msg.level);
+    }
+};
+
+///////////////////////////////////////////////////////////////////////
+// Date time pattern appenders
+///////////////////////////////////////////////////////////////////////
+
+static const char* ampm(const tm& t)
+{
+    return t.tm_hour >= 12 ? "PM" : "AM";
+}
+
+static int to12h(const tm& t)
+{
+    return t.tm_hour > 12 ? t.tm_hour - 12 : t.tm_hour;
+}
+
+//Abbreviated weekday name
+static const std::string days[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
+class a_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << days[tm_time.tm_wday];
+    }
+};
+
+//Full weekday name
+static const std::string full_days[] { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
+class A_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << full_days[tm_time.tm_wday];
+    }
+};
+
+//Abbreviated month
+static const std::string  months[] { "Jan", "Feb", "Mar", "Apr", "May", "June", "July", "Aug", "Sept", "Oct", "Nov", "Dec" };
+class b_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted<< months[tm_time.tm_mon];
+    }
+};
+
+//Full month name
+static const std::string full_months[] { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
+class B_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << full_months[tm_time.tm_mon];
+    }
+};
+
+
+//write 2 ints seperated by sep with padding of 2
+static fmt::MemoryWriter& pad_n_join(fmt::MemoryWriter& w, int v1, int v2, char sep)
+{
+    w << fmt::pad(v1, 2, '0') << sep << fmt::pad(v2, 2, '0');
+    return w;
+}
+
+//write 3 ints seperated by sep with padding of 2
+static fmt::MemoryWriter& pad_n_join(fmt::MemoryWriter& w, int v1, int v2, int v3, char sep)
+{
+    w << fmt::pad(v1, 2, '0') << sep << fmt::pad(v2, 2, '0') << sep << fmt::pad(v3, 2, '0');
+    return w;
+}
+
+
+//Date and time representation (Thu Aug 23 15:35:46 2014)
+class c_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << days[tm_time.tm_wday] << ' ' << months[tm_time.tm_mon] << ' ' << tm_time.tm_mday << ' ';
+        pad_n_join(msg.formatted, tm_time.tm_hour, tm_time.tm_min, tm_time.tm_sec, ':') << ' ' << tm_time.tm_year + 1900;
+    }
+};
+
+
+// year - 2 digit
+class C_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_year % 100, 2, '0');
+    }
+};
+
+
+
+// Short MM/DD/YY date, equivalent to %m/%d/%y 08/23/01
+class D_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        pad_n_join(msg.formatted, tm_time.tm_mon + 1, tm_time.tm_mday, tm_time.tm_year % 100, '/');
+    }
+};
+
+
+// year - 4 digit
+class Y_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << tm_time.tm_year + 1900;
+    }
+};
+
+// month 1-12
+class m_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_mon + 1, 2, '0');
+    }
+};
+
+// day of month 1-31
+class d_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_mday, 2, '0');
+    }
+};
+
+// hours in 24 format  0-23
+class H_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_hour, 2, '0');
+    }
+};
+
+// hours in 12 format  1-12
+class I_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(to12h(tm_time), 2, '0');
+    }
+};
+
+// minutes 0-59
+class M_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_min, 2, '0');
+    }
+};
+
+// seconds 0-59
+class S_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << fmt::pad(tm_time.tm_sec, 2, '0');
+    }
+};
+
+// milliseconds
+class e_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        auto duration = msg.time.time_since_epoch();
+        auto millis = std::chrono::duration_cast<std::chrono::milliseconds>(duration).count() % 1000;
+        msg.formatted << fmt::pad(static_cast<int>(millis), 3, '0');
+    }
+};
+
+// microseconds
+class f_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        auto duration = msg.time.time_since_epoch();
+        auto micros = std::chrono::duration_cast<std::chrono::microseconds>(duration).count() % 1000000;
+        msg.formatted << fmt::pad(static_cast<int>(micros), 6, '0');
+    }
+};
+
+// nanoseconds
+class F_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        auto duration = msg.time.time_since_epoch();
+        auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count() % 1000000000;
+        msg.formatted << fmt::pad(static_cast<int>(ns), 9, '0');
+    }
+};
+
+// AM/PM
+class p_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        msg.formatted << ampm(tm_time);
+    }
+};
+
+
+// 12 hour clock 02:55:02 pm
+class r_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        pad_n_join(msg.formatted, to12h(tm_time), tm_time.tm_min, tm_time.tm_sec, ':') << ' ' << ampm(tm_time);
+    }
+};
+
+// 24-hour HH:MM time, equivalent to %H:%M
+class R_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        pad_n_join(msg.formatted, tm_time.tm_hour, tm_time.tm_min, ':');
+    }
+};
+
+// ISO 8601 time format (HH:MM:SS), equivalent to %H:%M:%S
+class T_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+        pad_n_join(msg.formatted, tm_time.tm_hour, tm_time.tm_min, tm_time.tm_sec, ':');
+    }
+};
+
+
+// ISO 8601 offset from UTC in timezone (+-HH:MM)
+class z_formatter :public flag_formatter
+{
+public:
+    const std::chrono::seconds cache_refresh = std::chrono::seconds(5);
+
+    z_formatter() :_last_update(std::chrono::seconds(0)) {}
+    z_formatter(const z_formatter&) = delete;
+    z_formatter& operator=(const z_formatter&) = delete;
+
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+#ifdef _WIN32
+        int total_minutes = get_cached_offset(msg, tm_time);
+#else
+        // No need to chache under gcc,
+        // it is very fast (already stored in tm.tm_gmtoff)
+        int total_minutes = os::utc_minutes_offset(tm_time);
+#endif
+
+        int h = total_minutes / 60;
+        int m = total_minutes % 60;
+        if (h >= 0) //minus sign will be printed anyway if negative
+        {
+            msg.formatted << '+';
+        }
+        pad_n_join(msg.formatted, h, m, ':');
+    }
+private:
+    log_clock::time_point _last_update;
+    int _offset_minutes;
+    std::mutex _mutex;
+
+    int get_cached_offset(const log_msg& msg, const std::tm& tm_time)
+    {
+        using namespace std::chrono;
+        std::lock_guard<std::mutex> l(_mutex);
+        if (msg.time - _last_update >= cache_refresh)
+        {
+            _offset_minutes = os::utc_minutes_offset(tm_time);
+            _last_update = msg.time;
+        }
+        return _offset_minutes;
+    }
+};
+
+
+
+//Thread id
+class t_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << msg.thread_id;
+    }
+};
+
+
+class v_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << fmt::StringRef(msg.raw.data(), msg.raw.size());
+    }
+};
+
+class ch_formatter :public flag_formatter
+{
+public:
+    explicit ch_formatter(char ch) : _ch(ch)
+    {}
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << _ch;
+    }
+private:
+    char _ch;
+};
+
+
+//aggregate user chars to display as is
+class aggregate_formatter :public flag_formatter
+{
+public:
+    aggregate_formatter()
+    {}
+    void add_ch(char ch)
+    {
+        _str += ch;
+    }
+    void format(details::log_msg& msg, const std::tm&) override
+    {
+        msg.formatted << _str;
+    }
+private:
+    std::string _str;
+};
+
+// Full info formatter
+// pattern: [%Y-%m-%d %H:%M:%S.%e] [%n] [%l] %v
+class full_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg, const std::tm& tm_time) override
+    {
+#ifndef SPDLOG_NO_DATETIME
+        auto duration = msg.time.time_since_epoch();
+        auto millis = std::chrono::duration_cast<std::chrono::milliseconds>(duration).count() % 1000;
+
+        /* Slower version(while still very fast - about 3.2 million lines/sec under 10 threads),
+        msg.formatted.write("[{:d}-{:02d}-{:02d} {:02d}:{:02d}:{:02d}.{:03d}] [{}] [{}] {} ",
+        tm_time.tm_year + 1900,
+        tm_time.tm_mon + 1,
+        tm_time.tm_mday,
+        tm_time.tm_hour,
+        tm_time.tm_min,
+        tm_time.tm_sec,
+        static_cast<int>(millis),
+        msg.logger_name,
+        level::to_str(msg.level),
+        msg.raw.str());*/
+
+
+        // Faster (albeit uglier) way to format the line (5.6 million lines/sec under 10 threads)
+        msg.formatted << '[' << static_cast<unsigned int>(tm_time.tm_year + 1900) << '-'
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_mon + 1), 2, '0') << '-'
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_mday), 2, '0') << ' '
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_hour), 2, '0') << ':'
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_min), 2, '0') << ':'
+                      << fmt::pad(static_cast<unsigned int>(tm_time.tm_sec), 2, '0') << '.'
+                      << fmt::pad(static_cast<unsigned int>(millis), 3, '0') << "] ";
+
+//no datetime needed
+#else
+        (void)tm_time;
+#endif
+
+#ifndef SPDLOG_NO_NAME
+        msg.formatted << '[' << msg.logger_name << "] ";
+#endif
+
+        msg.formatted << '[' << level::to_str(msg.level) << "] ";
+        msg.formatted << fmt::StringRef(msg.raw.data(), msg.raw.size());
+    }
+};
+
+}
+}
+///////////////////////////////////////////////////////////////////////////////
+// pattern_formatter inline impl
+///////////////////////////////////////////////////////////////////////////////
+inline spdlog::pattern_formatter::pattern_formatter(const std::string& pattern)
+{
+    compile_pattern(pattern);
+}
+
+inline void spdlog::pattern_formatter::compile_pattern(const std::string& pattern)
+{
+    auto end = pattern.end();
+    std::unique_ptr<details::aggregate_formatter> user_chars;
+    for (auto it = pattern.begin(); it != end; ++it)
+    {
+        if (*it == '%')
+        {
+            if (user_chars) //append user chars found so far
+                _formatters.push_back(std::move(user_chars));
+
+            if (++it != end)
+                handle_flag(*it);
+            else
+                break;
+        }
+        else // chars not following the % sign should be displayed as is
+        {
+            if (!user_chars)
+                user_chars = std::unique_ptr<details::aggregate_formatter>(new details::aggregate_formatter());
+            user_chars->add_ch(*it);
+        }
+    }
+    if (user_chars) //append raw chars found so far
+    {
+        _formatters.push_back(std::move(user_chars));
+    }
+
+}
+inline void spdlog::pattern_formatter::handle_flag(char flag)
+{
+    switch (flag)
+    {
+    // logger name
+    case 'n':
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::name_formatter()));
+        break;
+
+    case 'l':
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::level_formatter()));
+        break;
+
+    case 'L':
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::short_level_formatter()));
+        break;
+
+    case('t') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::t_formatter()));
+        break;
+
+    case('v') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::v_formatter()));
+        break;
+
+    case('a') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::a_formatter()));
+        break;
+
+    case('A') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::A_formatter()));
+        break;
+
+    case('b') :
+    case('h') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::b_formatter()));
+        break;
+
+    case('B') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::B_formatter()));
+        break;
+    case('c') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::c_formatter()));
+        break;
+
+    case('C') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::C_formatter()));
+        break;
+
+    case('Y') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::Y_formatter()));
+        break;
+
+    case('D') :
+    case('x') :
+
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::D_formatter()));
+        break;
+
+    case('m') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::m_formatter()));
+        break;
+
+    case('d') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::d_formatter()));
+        break;
+
+    case('H') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::H_formatter()));
+        break;
+
+    case('I') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::I_formatter()));
+        break;
+
+    case('M') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::M_formatter()));
+        break;
+
+    case('S') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::S_formatter()));
+        break;
+
+    case('e') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::e_formatter()));
+        break;
+
+    case('f') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::f_formatter()));
+        break;
+    case('F') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::F_formatter()));
+        break;
+
+    case('p') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::p_formatter()));
+        break;
+
+    case('r') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::r_formatter()));
+        break;
+
+    case('R') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::R_formatter()));
+        break;
+
+    case('T') :
+    case('X') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::T_formatter()));
+        break;
+
+    case('z') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::z_formatter()));
+        break;
+
+    case ('+'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::full_formatter()));
+        break;
+
+    default: //Unkown flag appears as is
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::ch_formatter('%')));
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::ch_formatter(flag)));
+        break;
+    }
+}
+
+
+inline void spdlog::pattern_formatter::format(details::log_msg& msg)
+{
+    try
+    {
+        auto tm_time = details::os::localtime(log_clock::to_time_t(msg.time));
+        for (auto &f : _formatters)
+        {
+            f->format(msg, tm_time);
+        }
+        //write eol
+        msg.formatted << details::os::eol();
+    }
+    catch(const fmt::FormatError& e)
+    {
+        throw spdlog_ex(fmt::format("formatting error while processing format string: {}", e.what()));
+    }
+}

src/spdlog/details/registry.h

@@ -0,0 +1,163 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Loggers registy of unique name->logger pointer
+// An attempt to create a logger with an already existing name will be ignored
+// If user requests a non existing logger, nullptr will be returned
+// This class is thread safe
+
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/logger.h>
+#include <spdlog/async_logger.h>
+#include <spdlog/common.h>
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <unordered_map>
+
+namespace spdlog
+{
+namespace details
+{
+template <class Mutex> class registry_t
+{
+public:
+
+    void register_logger(std::shared_ptr<logger> logger)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        auto logger_name = logger->name();
+        throw_if_exists(logger_name);
+        _loggers[logger_name] = logger;
+    }
+
+
+    std::shared_ptr<logger> get(const std::string& logger_name)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        auto found = _loggers.find(logger_name);
+        return found == _loggers.end() ? nullptr : found->second;
+    }
+
+    template<class It>
+    std::shared_ptr<logger> create(const std::string& logger_name, const It& sinks_begin, const It& sinks_end)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        throw_if_exists(logger_name);
+        std::shared_ptr<logger> new_logger;
+        if (_async_mode)
+            new_logger = std::make_shared<async_logger>(logger_name, sinks_begin, sinks_end, _async_q_size, _overflow_policy, _worker_warmup_cb, _flush_interval_ms);
+        else
+            new_logger = std::make_shared<logger>(logger_name, sinks_begin, sinks_end);
+
+        if (_formatter)
+            new_logger->set_formatter(_formatter);
+
+        new_logger->set_level(_level);
+        //Add to registry
+        _loggers[logger_name] = new_logger;
+        return new_logger;
+    }
+
+    void drop(const std::string& logger_name)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _loggers.erase(logger_name);
+    }
+
+    void drop_all()
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _loggers.clear();
+    }
+    std::shared_ptr<logger> create(const std::string& logger_name, sinks_init_list sinks)
+    {
+        return create(logger_name, sinks.begin(), sinks.end());
+    }
+
+    std::shared_ptr<logger> create(const std::string& logger_name, sink_ptr sink)
+    {
+        return create(logger_name, { sink });
+    }
+
+
+    void formatter(formatter_ptr f)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _formatter = f;
+        for (auto& l : _loggers)
+            l.second->set_formatter(_formatter);
+    }
+
+    void set_pattern(const std::string& pattern)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _formatter = std::make_shared<pattern_formatter>(pattern);
+        for (auto& l : _loggers)
+            l.second->set_formatter(_formatter);
+    }
+
+    void set_level(level::level_enum log_level)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        for (auto& l : _loggers)
+            l.second->set_level(log_level);
+        _level = log_level;
+    }
+
+    void set_async_mode(size_t q_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms)
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _async_mode = true;
+        _async_q_size = q_size;
+        _overflow_policy = overflow_policy;
+        _worker_warmup_cb = worker_warmup_cb;
+        _flush_interval_ms = flush_interval_ms;
+    }
+
+    void set_sync_mode()
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _async_mode = false;
+    }
+
+    static registry_t<Mutex>& instance()
+    {
+        static registry_t<Mutex> s_instance;
+        return s_instance;
+    }
+
+private:
+    registry_t<Mutex>() {}
+    registry_t<Mutex>(const registry_t<Mutex>&) = delete;
+    registry_t<Mutex>& operator=(const registry_t<Mutex>&) = delete;
+
+    void throw_if_exists(const std::string &logger_name)
+    {
+        if (_loggers.find(logger_name) != _loggers.end())
+            throw spdlog_ex("logger with name '" + logger_name + "' already exists");
+    }
+    Mutex _mutex;
+    std::unordered_map <std::string, std::shared_ptr<logger>> _loggers;
+    formatter_ptr _formatter;
+    level::level_enum _level = level::info;
+    bool _async_mode = false;
+    size_t _async_q_size = 0;
+    async_overflow_policy _overflow_policy = async_overflow_policy::block_retry;
+    std::function<void()> _worker_warmup_cb = nullptr;
+    std::chrono::milliseconds _flush_interval_ms;
+};
+#ifdef SPDLOG_NO_REGISTRY_MUTEX
+typedef registry_t<spdlog::details::null_mutex> registry;
+#else
+typedef registry_t<std::mutex> registry;
+#endif
+}
+}

src/spdlog/details/spdlog_impl.h

@@ -0,0 +1,149 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+//
+// Global registry functions
+//
+#include <spdlog/spdlog.h>
+#include <spdlog/details/registry.h>
+#include <spdlog/sinks/file_sinks.h>
+#include <spdlog/sinks/stdout_sinks.h>
+#include <spdlog/sinks/syslog_sink.h>
+#include <spdlog/sinks/ansicolor_sink.h>
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <string>
+
+inline void spdlog::register_logger(std::shared_ptr<logger> logger)
+{
+    return details::registry::instance().register_logger(logger);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::get(const std::string& name)
+{
+    return details::registry::instance().get(name);
+}
+
+inline void spdlog::drop(const std::string &name)
+{
+    details::registry::instance().drop(name);
+}
+
+// Create multi/single threaded rotating file logger
+inline std::shared_ptr<spdlog::logger> spdlog::rotating_logger_mt(const std::string& logger_name, const filename_t& filename, size_t max_file_size, size_t max_files, bool force_flush)
+{
+    return create<spdlog::sinks::rotating_file_sink_mt>(logger_name, filename, SPDLOG_FILENAME_T("txt"), max_file_size, max_files, force_flush);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::rotating_logger_st(const std::string& logger_name, const filename_t& filename, size_t max_file_size, size_t max_files, bool force_flush)
+{
+    return create<spdlog::sinks::rotating_file_sink_st>(logger_name, filename, SPDLOG_FILENAME_T("txt"), max_file_size, max_files, force_flush);
+}
+
+// Create file logger which creates new file at midnight):
+inline std::shared_ptr<spdlog::logger> spdlog::daily_logger_mt(const std::string& logger_name, const filename_t& filename, int hour, int minute, bool force_flush)
+{
+    return create<spdlog::sinks::daily_file_sink_mt>(logger_name, filename, SPDLOG_FILENAME_T("txt"), hour, minute, force_flush);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::daily_logger_st(const std::string& logger_name, const filename_t& filename, int hour, int minute, bool force_flush)
+{
+    return create<spdlog::sinks::daily_file_sink_st>(logger_name, filename, SPDLOG_FILENAME_T("txt"), hour, minute, force_flush);
+}
+
+// Create stdout/stderr loggers (with optinal color support)
+inline std::shared_ptr<spdlog::logger> create_console_logger(const std::string& logger_name, spdlog::sink_ptr sink, bool color)
+{
+    if (color) //use color wrapper sink
+        sink = std::make_shared<spdlog::sinks::ansicolor_sink>(sink);
+    return spdlog::details::registry::instance().create(logger_name, sink);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stdout_logger_mt(const std::string& logger_name, bool color)
+{
+    return create_console_logger(logger_name, sinks::stdout_sink_mt::instance(), color);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stdout_logger_st(const std::string& logger_name, bool color)
+{
+    return create_console_logger(logger_name, sinks::stdout_sink_st::instance(), color);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stderr_logger_mt(const std::string& logger_name, bool color)
+{
+    return create_console_logger(logger_name, sinks::stderr_sink_mt::instance(), color);
+}
+
+inline std::shared_ptr<spdlog::logger> spdlog::stderr_logger_st(const std::string& logger_name, bool color)
+{
+    return create_console_logger(logger_name, sinks::stderr_sink_st::instance(), color);
+}
+
+#if defined(__linux__) || defined(__APPLE__)
+// Create syslog logger
+inline std::shared_ptr<spdlog::logger> spdlog::syslog_logger(const std::string& logger_name, const std::string& syslog_ident, int syslog_option)
+{
+    return create<spdlog::sinks::syslog_sink>(logger_name, syslog_ident, syslog_option);
+}
+#endif
+
+
+//Create logger with multiple sinks
+
+inline std::shared_ptr<spdlog::logger> spdlog::create(const std::string& logger_name, spdlog::sinks_init_list sinks)
+{
+    return details::registry::instance().create(logger_name, sinks);
+}
+
+
+template <typename Sink, typename... Args>
+inline std::shared_ptr<spdlog::logger> spdlog::create(const std::string& logger_name, Args... args)
+{
+    sink_ptr sink = std::make_shared<Sink>(args...);
+    return details::registry::instance().create(logger_name, { sink });
+}
+
+
+template<class It>
+inline std::shared_ptr<spdlog::logger> spdlog::create(const std::string& logger_name, const It& sinks_begin, const It& sinks_end)
+{
+    return details::registry::instance().create(logger_name, sinks_begin, sinks_end);
+}
+
+inline void spdlog::set_formatter(spdlog::formatter_ptr f)
+{
+    details::registry::instance().formatter(f);
+}
+
+inline void spdlog::set_pattern(const std::string& format_string)
+{
+    return details::registry::instance().set_pattern(format_string);
+}
+
+inline void spdlog::set_level(level::level_enum log_level)
+{
+    return details::registry::instance().set_level(log_level);
+}
+
+
+inline void spdlog::set_async_mode(size_t queue_size, const async_overflow_policy overflow_policy, const std::function<void()>& worker_warmup_cb, const std::chrono::milliseconds& flush_interval_ms)
+{
+    details::registry::instance().set_async_mode(queue_size, overflow_policy, worker_warmup_cb, flush_interval_ms);
+}
+
+inline void spdlog::set_sync_mode()
+{
+    details::registry::instance().set_sync_mode();
+}
+
+inline void spdlog::drop_all()
+{
+    details::registry::instance().drop_all();
+}
+

src/spdlog/formatter.h

@@ -0,0 +1,45 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/details/log_msg.h>
+
+#include <vector>
+#include <string>
+#include <memory>
+
+namespace spdlog
+{
+namespace details
+{
+class flag_formatter;
+}
+
+class formatter
+{
+public:
+    virtual ~formatter() {}
+    virtual void format(details::log_msg& msg) = 0;
+};
+
+class pattern_formatter : public formatter
+{
+
+public:
+    explicit pattern_formatter(const std::string& pattern);
+    pattern_formatter(const pattern_formatter&) = delete;
+    pattern_formatter& operator=(const pattern_formatter&) = delete;
+    void format(details::log_msg& msg) override;
+private:
+    const std::string _pattern;
+    std::vector<std::unique_ptr<details::flag_formatter>> _formatters;
+    void handle_flag(char flag);
+    void compile_pattern(const std::string& pattern);
+};
+}
+
+#include <spdlog/details/pattern_formatter_impl.h>
+

src/spdlog/logger.h

@@ -0,0 +1,112 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+// Thread safe logger
+// Has name, log level, vector of std::shared sink pointers and formatter
+// Upon each log write the logger:
+// 1. Checks if its log level is enough to log the message
+// 2. Format the message using the formatter function
+// 3. Pass the formatted message to its sinks to performa the actual logging
+
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/common.h>
+#include <spdlog/details/line_logger_fwd.h>
+
+#include <vector>
+#include <memory>
+#include <string>
+
+namespace spdlog
+{
+
+class logger
+{
+public:
+    logger(const std::string& logger_name, sink_ptr single_sink);
+    logger(const std::string& name, sinks_init_list);
+    template<class It>
+    logger(const std::string& name, const It& begin, const It& end);
+
+    virtual ~logger();
+    logger(const logger&) = delete;
+    logger& operator=(const logger&) = delete;
+
+    void set_level(level::level_enum);
+    level::level_enum level() const;
+
+    const std::string& name() const;
+    bool should_log(level::level_enum) const;
+
+    // logger.info(cppformat_string, arg1, arg2, arg3, ...) call style
+    template <typename... Args> details::line_logger trace(const char* fmt, const Args&... args);
+    template <typename... Args> details::line_logger debug(const char* fmt, const Args&... args);
+    template <typename... Args> details::line_logger info(const char* fmt, const Args&... args);
+    template <typename... Args> details::line_logger notice(const char* fmt, const Args&... args);
+    template <typename... Args> details::line_logger warn(const char* fmt, const Args&... args);
+    template <typename... Args> details::line_logger error(const char* fmt, const Args&... args);
+    template <typename... Args> details::line_logger critical(const char* fmt, const Args&... args);
+    template <typename... Args> details::line_logger alert(const char* fmt, const Args&... args);
+    template <typename... Args> details::line_logger emerg(const char* fmt, const Args&... args);
+
+
+    // logger.info(msg) << ".." call style
+    template <typename T> details::line_logger trace(const T&);
+    template <typename T> details::line_logger debug(const T&);
+    template <typename T> details::line_logger info(const T&);
+    template <typename T> details::line_logger notice(const T&);
+    template <typename T> details::line_logger warn(const T&);
+    template <typename T> details::line_logger error(const T&);
+    template <typename T> details::line_logger critical(const T&);
+    template <typename T> details::line_logger alert(const T&);
+    template <typename T> details::line_logger emerg(const T&);
+
+
+    // logger.info() << ".." call  style
+    details::line_logger trace();
+    details::line_logger debug();
+    details::line_logger info();
+    details::line_logger notice();
+    details::line_logger warn();
+    details::line_logger error();
+    details::line_logger critical();
+    details::line_logger alert();
+    details::line_logger emerg();
+
+
+
+    // Create log message with the given level, no matter what is the actual logger's level
+    template <typename... Args>
+    details::line_logger force_log(level::level_enum lvl, const char* fmt, const Args&... args);
+
+    // Set the format of the log messages from this logger
+    void set_pattern(const std::string&);
+    void set_formatter(formatter_ptr);
+
+    virtual void flush();
+
+protected:
+    virtual void _log_msg(details::log_msg&);
+    virtual void _set_pattern(const std::string&);
+    virtual void _set_formatter(formatter_ptr);
+    details::line_logger _log_if_enabled(level::level_enum lvl);
+    template <typename... Args>
+    details::line_logger _log_if_enabled(level::level_enum lvl, const char* fmt, const Args&... args);
+    template<typename T>
+    inline details::line_logger _log_if_enabled(level::level_enum lvl, const T& msg);
+
+
+    friend details::line_logger;
+    std::string _name;
+    std::vector<sink_ptr> _sinks;
+    formatter_ptr _formatter;
+    spdlog::level_t _level;
+};
+}
+
+#include <spdlog/details/logger_impl.h>
+#include <spdlog/details/line_logger_impl.h>
+

src/spdlog/sinks/android_sink.h

@@ -0,0 +1,92 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#if defined(__ANDROID__)
+
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/details/null_mutex.h>
+
+#include <android/log.h>
+
+#include <mutex>
+#include <string>
+
+namespace spdlog
+{
+namespace sinks
+{
+/*
+* Android sink (logging using __android_log_write)
+*/
+template<class Mutex>
+class base_android_sink : public base_sink < Mutex >
+{
+public:
+    explicit base_android_sink(std::string tag="spdlog"): _tag(tag)
+    {
+    }
+
+    void flush() override
+    {
+    }
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        const android_LogPriority priority = convert_to_android(msg.level);
+        const int expected_size = msg.formatted.size();
+        const int size = __android_log_write(
+                             priority, _tag.c_str(), msg.formatted.c_str()
+                         );
+        if (size > expected_size)
+        {
+            // Will write a little bit more than original message
+        }
+        else
+        {
+            throw spdlog_ex("Send to Android logcat failed");
+        }
+    }
+
+private:
+    static android_LogPriority convert_to_android(spdlog::level::level_enum level)
+    {
+        switch(level)
+        {
+        case spdlog::level::trace:
+            return ANDROID_LOG_VERBOSE;
+        case spdlog::level::debug:
+            return ANDROID_LOG_DEBUG;
+        case spdlog::level::info:
+            return ANDROID_LOG_INFO;
+        case spdlog::level::notice:
+            return ANDROID_LOG_INFO;
+        case spdlog::level::warn:
+            return ANDROID_LOG_WARN;
+        case spdlog::level::err:
+            return ANDROID_LOG_ERROR;
+        case spdlog::level::critical:
+            return ANDROID_LOG_FATAL;
+        case spdlog::level::alert:
+            return ANDROID_LOG_FATAL;
+        case spdlog::level::emerg:
+            return ANDROID_LOG_FATAL;
+        default:
+            throw spdlog_ex("Incorrect level value");
+        }
+    }
+
+    std::string _tag;
+};
+
+typedef base_android_sink<std::mutex> android_sink_mt;
+typedef base_android_sink<details::null_mutex> android_sink_st;
+
+}
+}
+
+#endif

src/spdlog/sinks/ansicolor_sink.h

@@ -0,0 +1,115 @@
+//
+// Copyright(c) 2016 Kevin M. Godby (a modified version by spdlog).
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/common.h>
+
+#include <string>
+#include <map>
+
+namespace spdlog
+{
+namespace sinks
+{
+
+/**
+ * @brief The ansi_color_sink is a decorator around another sink and prefixes
+ * the output with an ANSI escape sequence color code depending on the severity
+ * of the message.
+ */
+class ansicolor_sink : public sink
+{
+public:
+    ansicolor_sink(sink_ptr wrapped_sink);
+    virtual ~ansicolor_sink();
+
+    ansicolor_sink(const ansicolor_sink& other) = delete;
+    ansicolor_sink& operator=(const ansicolor_sink& other) = delete;
+
+    virtual void log(const details::log_msg& msg) override;
+    virtual void flush() override;
+
+    void set_color(level::level_enum level, const std::string& color);
+
+    /// Formatting codes
+    const std::string reset      = "\033[00m";
+    const std::string bold       = "\033[1m";
+    const std::string dark       = "\033[2m";
+    const std::string underline  = "\033[4m";
+    const std::string blink      = "\033[5m";
+    const std::string reverse    = "\033[7m";
+    const std::string concealed  = "\033[8m";
+
+    // Foreground colors
+    const std::string grey       = "\033[30m";
+    const std::string red        = "\033[31m";
+    const std::string green      = "\033[32m";
+    const std::string yellow     = "\033[33m";
+    const std::string blue       = "\033[34m";
+    const std::string magenta    = "\033[35m";
+    const std::string cyan       = "\033[36m";
+    const std::string white      = "\033[37m";
+
+    /// Background colors
+    const std::string on_grey    = "\033[40m";
+    const std::string on_red     = "\033[41m";
+    const std::string on_green   = "\033[42m";
+    const std::string on_yellow  = "\033[43m";
+    const std::string on_blue    = "\033[44m";
+    const std::string on_magenta = "\033[45m";
+    const std::string on_cyan    = "\033[46m";
+    const std::string on_white   = "\033[47m";
+
+
+protected:
+    sink_ptr sink_;
+    std::map<level::level_enum, std::string> colors_;
+};
+
+inline ansicolor_sink::ansicolor_sink(sink_ptr wrapped_sink) : sink_(wrapped_sink)
+{
+    colors_[level::trace]    = cyan;
+    colors_[level::debug]    = cyan;
+    colors_[level::info]     = white;
+    colors_[level::notice]   = bold + white;
+    colors_[level::warn]     = bold + yellow;
+    colors_[level::err]      = red;
+    colors_[level::critical] = bold + red;
+    colors_[level::alert]    = bold + white + on_red;
+    colors_[level::emerg]    = bold + yellow + on_red;
+    colors_[level::off]      = reset;
+}
+
+inline void ansicolor_sink::log(const details::log_msg& msg)
+{
+    // Wrap the originally formatted message in color codes
+    const std::string& prefix = colors_[msg.level];
+    const std::string& s = msg.formatted.str();
+    const std::string& suffix = reset;
+    details::log_msg m;
+    m.formatted << prefix  << s << suffix;
+    sink_->log(m);
+}
+
+inline void ansicolor_sink::flush()
+{
+    sink_->flush();
+}
+
+inline void ansicolor_sink::set_color(level::level_enum level, const std::string& color)
+{
+    colors_[level] = color;
+}
+
+inline ansicolor_sink::~ansicolor_sink()
+{
+    flush();
+}
+
+} // namespace sinks
+} // namespace spdlog
+

src/spdlog/sinks/base_sink.h

@@ -0,0 +1,45 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+//
+// base sink templated over a mutex (either dummy or realy)
+// concrete implementation should only overrid the _sink_it method.
+// all locking is taken care of here so no locking needed by the implementors..
+//
+
+#include <spdlog/sinks/sink.h>
+#include <spdlog/formatter.h>
+#include <spdlog/common.h>
+#include <spdlog/details/log_msg.h>
+
+#include <mutex>
+
+namespace spdlog
+{
+namespace sinks
+{
+template<class Mutex>
+class base_sink:public sink
+{
+public:
+    base_sink():_mutex() {}
+    virtual ~base_sink() = default;
+
+    base_sink(const base_sink&) = delete;
+    base_sink& operator=(const base_sink&) = delete;
+
+    void log(const details::log_msg& msg) override
+    {
+        std::lock_guard<Mutex> lock(_mutex);
+        _sink_it(msg);
+    }
+
+protected:
+    virtual void _sink_it(const details::log_msg& msg) = 0;
+    Mutex _mutex;
+};
+}
+}

src/spdlog/sinks/dist_sink.h

@@ -0,0 +1,72 @@
+//
+// Copyright (c) 2015 David Schury, Gabi Melman
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/details/log_msg.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/sinks/sink.h>
+
+#include <algorithm>
+#include <memory>
+#include <mutex>
+#include <vector>
+
+namespace spdlog
+{
+namespace sinks
+{
+template<class Mutex>
+class dist_sink: public base_sink<Mutex>
+{
+public:
+    explicit dist_sink() :_sinks() {}
+    dist_sink(const dist_sink&) = delete;
+    dist_sink& operator=(const dist_sink&) = delete;
+    virtual ~dist_sink() = default;
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        for (auto iter = _sinks.begin(); iter != _sinks.end(); iter++)
+            (*iter)->log(msg);
+    }
+
+    std::vector<std::shared_ptr<sink>> _sinks;
+
+public:
+    void flush() override
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::_mutex);
+        for (auto iter = _sinks.begin(); iter != _sinks.end(); iter++)
+            (*iter)->flush();
+    }
+
+    void add_sink(std::shared_ptr<sink> sink)
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::_mutex);
+        if (sink &&
+                _sinks.end() == std::find(_sinks.begin(), _sinks.end(), sink))
+        {
+            _sinks.push_back(sink);
+        }
+    }
+
+    void remove_sink(std::shared_ptr<sink> sink)
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::_mutex);
+        auto pos = std::find(_sinks.begin(), _sinks.end(), sink);
+        if (pos != _sinks.end())
+        {
+            _sinks.erase(pos);
+        }
+    }
+};
+
+typedef dist_sink<std::mutex> dist_sink_mt;
+typedef dist_sink<details::null_mutex> dist_sink_st;
+}
+}

src/spdlog/sinks/file_sinks.h

@@ -0,0 +1,220 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/details/file_helper.h>
+#include <spdlog/details/format.h>
+
+#include <algorithm>
+#include <chrono>
+#include <cstdio>
+#include <ctime>
+#include <mutex>
+#include <string>
+
+namespace spdlog
+{
+namespace sinks
+{
+/*
+* Trivial file sink with single file as target
+*/
+template<class Mutex>
+class simple_file_sink : public base_sink < Mutex >
+{
+public:
+    explicit simple_file_sink(const filename_t &filename,
+                              bool force_flush = false) :
+        _file_helper(force_flush)
+    {
+        _file_helper.open(filename);
+    }
+    void flush() override
+    {
+        _file_helper.flush();
+    }
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        _file_helper.write(msg);
+    }
+private:
+    details::file_helper _file_helper;
+};
+
+typedef simple_file_sink<std::mutex> simple_file_sink_mt;
+typedef simple_file_sink<details::null_mutex> simple_file_sink_st;
+
+/*
+* Rotating file sink based on size
+*/
+template<class Mutex>
+class rotating_file_sink : public base_sink < Mutex >
+{
+public:
+    rotating_file_sink(const filename_t &base_filename, const filename_t &extension,
+                       std::size_t max_size, std::size_t max_files,
+                       bool force_flush = false) :
+        _base_filename(base_filename),
+        _extension(extension),
+        _max_size(max_size),
+        _max_files(max_files),
+        _current_size(0),
+        _file_helper(force_flush)
+    {
+        _file_helper.open(calc_filename(_base_filename, 0, _extension));
+        _current_size = _file_helper.size(); //expensive. called only once
+    }
+
+    void flush() override
+    {
+        _file_helper.flush();
+    }
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        _current_size += msg.formatted.size();
+        if (_current_size > _max_size)
+        {
+            _rotate();
+            _current_size = msg.formatted.size();
+        }
+        _file_helper.write(msg);
+    }
+
+private:
+    static filename_t calc_filename(const filename_t& filename, std::size_t index, const filename_t& extension)
+    {
+        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
+        if (index)
+            w.write(SPDLOG_FILENAME_T("{}.{}.{}"), filename, index, extension);
+        else
+            w.write(SPDLOG_FILENAME_T("{}.{}"), filename, extension);
+        return w.str();
+    }
+
+    // Rotate files:
+    // log.txt -> log.1.txt
+    // log.1.txt -> log2.txt
+    // log.2.txt -> log3.txt
+    // log.3.txt -> delete
+
+    void _rotate()
+    {
+        _file_helper.close();
+        for (auto i = _max_files; i > 0; --i)
+        {
+            filename_t src = calc_filename(_base_filename, i - 1, _extension);
+            filename_t target = calc_filename(_base_filename, i, _extension);
+
+            if (details::file_helper::file_exists(target))
+            {
+                if (details::os::remove(target) != 0)
+                {
+                    throw spdlog_ex("rotating_file_sink: failed removing " + filename_to_str(target));
+                }
+            }
+            if (details::file_helper::file_exists(src) && details::os::rename(src, target))
+            {
+                throw spdlog_ex("rotating_file_sink: failed renaming " + filename_to_str(src) + " to " + filename_to_str(target));
+            }
+        }
+        _file_helper.reopen(true);
+    }
+    filename_t _base_filename;
+    filename_t _extension;
+    std::size_t _max_size;
+    std::size_t _max_files;
+    std::size_t _current_size;
+    details::file_helper _file_helper;
+};
+
+typedef rotating_file_sink<std::mutex> rotating_file_sink_mt;
+typedef rotating_file_sink<details::null_mutex>rotating_file_sink_st;
+
+/*
+* Rotating file sink based on date. rotates at midnight
+*/
+template<class Mutex>
+class daily_file_sink :public base_sink < Mutex >
+{
+public:
+    //create daily file sink which rotates on given time
+    daily_file_sink(
+        const filename_t& base_filename,
+        const filename_t& extension,
+        int rotation_hour,
+        int rotation_minute,
+        bool force_flush = false) : _base_filename(base_filename),
+        _extension(extension),
+        _rotation_h(rotation_hour),
+        _rotation_m(rotation_minute),
+        _file_helper(force_flush)
+    {
+        if (rotation_hour < 0 || rotation_hour > 23 || rotation_minute < 0 || rotation_minute > 59)
+            throw spdlog_ex("daily_file_sink: Invalid rotation time in ctor");
+        _rotation_tp = _next_rotation_tp();
+        _file_helper.open(calc_filename(_base_filename, _extension));
+    }
+
+    void flush() override
+    {
+        _file_helper.flush();
+    }
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        if (std::chrono::system_clock::now() >= _rotation_tp)
+        {
+            _file_helper.open(calc_filename(_base_filename, _extension));
+            _rotation_tp = _next_rotation_tp();
+        }
+        _file_helper.write(msg);
+    }
+
+private:
+    std::chrono::system_clock::time_point _next_rotation_tp()
+    {
+        using namespace std::chrono;
+        auto now = system_clock::now();
+        time_t tnow = std::chrono::system_clock::to_time_t(now);
+        tm date = spdlog::details::os::localtime(tnow);
+        date.tm_hour = _rotation_h;
+        date.tm_min = _rotation_m;
+        date.tm_sec = 0;
+        auto rotation_time = std::chrono::system_clock::from_time_t(std::mktime(&date));
+        if (rotation_time > now)
+            return rotation_time;
+        else
+            return system_clock::time_point(rotation_time + hours(24));
+    }
+
+    //Create filename for the form basename.YYYY-MM-DD.extension
+    static filename_t calc_filename(const filename_t& basename, const filename_t& extension)
+    {
+        std::tm tm = spdlog::details::os::localtime();
+        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
+        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}_{:02d}-{:02d}.{}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, extension);
+        return w.str();
+    }
+
+    filename_t _base_filename;
+    filename_t _extension;
+    int _rotation_h;
+    int _rotation_m;
+    std::chrono::system_clock::time_point _rotation_tp;
+    details::file_helper _file_helper;
+};
+
+typedef daily_file_sink<std::mutex> daily_file_sink_mt;
+typedef daily_file_sink<details::null_mutex> daily_file_sink_st;
+}
+}

src/spdlog/sinks/msvc_sink.h

@@ -0,0 +1,50 @@
+//
+// Copyright(c) 2016 Alexander Dalshov.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#if defined(_MSC_VER)
+
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/details/null_mutex.h>
+
+#include <WinBase.h>
+
+#include <mutex>
+#include <string>
+
+namespace spdlog
+{
+namespace sinks
+{
+/*
+* MSVC sink (logging using OutputDebugStringA)
+*/
+template<class Mutex>
+class msvc_sink : public base_sink < Mutex >
+{
+public:
+    explicit msvc_sink()
+    {
+    }
+
+    void flush() override
+    {
+    }
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        OutputDebugStringA(msg.formatted.c_str());
+    }
+};
+
+typedef msvc_sink<std::mutex> msvc_sink_mt;
+typedef msvc_sink<details::null_mutex> msvc_sink_st;
+
+}
+}
+
+#endif

src/spdlog/sinks/null_sink.h

@@ -0,0 +1,34 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/details/null_mutex.h>
+
+#include <mutex>
+
+namespace spdlog
+{
+namespace sinks
+{
+
+template <class Mutex>
+class null_sink : public base_sink < Mutex >
+{
+protected:
+    void _sink_it(const details::log_msg&) override
+    {}
+
+    void flush() override
+    {}
+
+};
+typedef null_sink<details::null_mutex> null_sink_st;
+typedef null_sink<std::mutex> null_sink_mt;
+
+}
+}
+

src/spdlog/sinks/ostream_sink.h

@@ -0,0 +1,47 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/sinks/base_sink.h>
+
+#include <ostream>
+#include <mutex>
+
+namespace spdlog
+{
+namespace sinks
+{
+template<class Mutex>
+class ostream_sink: public base_sink<Mutex>
+{
+public:
+    explicit ostream_sink(std::ostream& os, bool force_flush=false) :_ostream(os), _force_flush(force_flush) {}
+    ostream_sink(const ostream_sink&) = delete;
+    ostream_sink& operator=(const ostream_sink&) = delete;
+    virtual ~ostream_sink() = default;
+
+protected:
+    void _sink_it(const details::log_msg& msg) override
+    {
+        _ostream.write(msg.formatted.data(), msg.formatted.size());
+        if (_force_flush)
+            _ostream.flush();
+    }
+
+    void flush() override
+    {
+        _ostream.flush();
+    }
+
+    std::ostream& _ostream;
+    bool _force_flush;
+};
+
+typedef ostream_sink<std::mutex> ostream_sink_mt;
+typedef ostream_sink<details::null_mutex> ostream_sink_st;
+}
+}

src/spdlog/sinks/sink.h

@@ -0,0 +1,24 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+
+#pragma once
+
+#include <spdlog/details/log_msg.h>
+
+namespace spdlog
+{
+namespace sinks
+{
+class sink
+{
+public:
+    virtual ~sink() {}
+    virtual void log(const details::log_msg& msg) = 0;
+    virtual void flush() = 0;
+};
+}
+}
+

src/spdlog/sinks/stdout_sinks.h

@@ -0,0 +1,74 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <spdlog/details/null_mutex.h>
+
+#include <cstdio>
+#include <memory>
+#include <mutex>
+
+namespace spdlog
+{
+namespace sinks
+{
+
+template <class Mutex>
+class stdout_sink : public base_sink<Mutex>
+{
+    using MyType = stdout_sink<Mutex>;
+public:
+    stdout_sink() {}
+    static std::shared_ptr<MyType> instance()
+    {
+        static std::shared_ptr<MyType> instance = std::make_shared<MyType>();
+        return instance;
+    }
+
+    void _sink_it(const details::log_msg& msg) override
+    {
+        fwrite(msg.formatted.data(), sizeof(char), msg.formatted.size(), stdout);
+        flush();
+    }
+
+    void flush() override
+    {
+        fflush(stdout);
+    }
+};
+
+typedef stdout_sink<details::null_mutex> stdout_sink_st;
+typedef stdout_sink<std::mutex> stdout_sink_mt;
+
+
+template <class Mutex>
+class stderr_sink : public base_sink<Mutex>
+{
+    using MyType = stderr_sink<Mutex>;
+public:
+    stderr_sink() {}
+    static std::shared_ptr<MyType> instance()
+    {
+        static std::shared_ptr<MyType> instance = std::make_shared<MyType>();
+        return instance;
+    }
+
+    void _sink_it(const details::log_msg& msg) override
+    {
+        fwrite(msg.formatted.data(), sizeof(char), msg.formatted.size(), stderr);
+        flush();
+    }
+
+    void flush() override
+    {
+        fflush(stderr);
+    }
+};
+
+typedef stderr_sink<std::mutex> stderr_sink_mt;
+typedef stderr_sink<details::null_mutex> stderr_sink_st;
+}
+}

src/spdlog/sinks/syslog_sink.h

@@ -0,0 +1,83 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#if defined(__linux__) || defined(__APPLE__)
+
+#include <spdlog/sinks/sink.h>
+#include <spdlog/common.h>
+#include <spdlog/details/log_msg.h>
+
+#include <array>
+#include <string>
+#include <syslog.h>
+
+
+namespace spdlog
+{
+namespace sinks
+{
+/**
+ * Sink that write to syslog using the `syscall()` library call.
+ *
+ * Locking is not needed, as `syslog()` itself is thread-safe.
+ */
+class syslog_sink : public sink
+{
+public:
+    //
+    syslog_sink(const std::string& ident = "", int syslog_option=0, int syslog_facility=LOG_USER):
+        _ident(ident)
+    {
+        _priorities[static_cast<int>(level::trace)] = LOG_DEBUG;
+        _priorities[static_cast<int>(level::debug)] = LOG_DEBUG;
+        _priorities[static_cast<int>(level::info)] = LOG_INFO;
+        _priorities[static_cast<int>(level::notice)] = LOG_NOTICE;
+        _priorities[static_cast<int>(level::warn)] = LOG_WARNING;
+        _priorities[static_cast<int>(level::err)] = LOG_ERR;
+        _priorities[static_cast<int>(level::critical)] = LOG_CRIT;
+        _priorities[static_cast<int>(level::alert)] = LOG_ALERT;
+        _priorities[static_cast<int>(level::emerg)] = LOG_EMERG;
+        _priorities[static_cast<int>(level::off)] = LOG_INFO;
+
+        //set ident to be program name if empty
+        ::openlog(_ident.empty()? nullptr:_ident.c_str(), syslog_option, syslog_facility);
+    }
+    ~syslog_sink()
+    {
+        ::closelog();
+    }
+
+    syslog_sink(const syslog_sink&) = delete;
+    syslog_sink& operator=(const syslog_sink&) = delete;
+
+    void log(const details::log_msg &msg) override
+    {
+        ::syslog(syslog_prio_from_level(msg), "%s", msg.raw.str().c_str());
+    }
+
+    void flush() override
+    {
+    }
+
+
+private:
+    std::array<int, 10> _priorities;
+    //must store the ident because the man says openlog might use the pointer as is and not a string copy
+    const std::string _ident;
+
+    //
+    // Simply maps spdlog's log level to syslog priority level.
+    //
+    int syslog_prio_from_level(const details::log_msg &msg) const
+    {
+        return _priorities[static_cast<int>(msg.level)];
+    }
+};
+}
+}
+
+#endif

src/spdlog/spdlog.h

@@ -0,0 +1,139 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+// spdlog main header file.
+// see example.cpp for usage example
+
+#pragma once
+
+#include <spdlog/tweakme.h>
+#include <spdlog/common.h>
+#include <spdlog/logger.h>
+
+#include <memory>
+#include <functional>
+#include <chrono>
+#include <string>
+
+namespace spdlog
+{
+// Return an existing logger or nullptr if a logger with such name doesn't exist.
+// Examples:
+//
+// spdlog::get("mylog")->info("Hello");
+// auto logger = spdlog::get("mylog");
+// logger.info("This is another message" , x, y, z);
+// logger.info() << "This is another message" << x << y << z;
+std::shared_ptr<logger> get(const std::string& name);
+
+//
+// Set global formatting
+// example: spdlog::set_pattern("%Y-%m-%d %H:%M:%S.%e %l : %v");
+//
+void set_pattern(const std::string& format_string);
+void set_formatter(formatter_ptr f);
+
+//
+// Set global logging level for
+//
+void set_level(level::level_enum log_level);
+
+//
+// Turn on async mode (off by default) and set the queue size for each async_logger.
+// effective only for loggers created after this call.
+// queue_size: size of queue (must be power of 2):
+//    Each logger will pre-allocate a dedicated queue with queue_size entries upon construction.
+//
+// async_overflow_policy (optional, block_retry by default):
+//    async_overflow_policy::block_retry - if queue is full, block until queue has room for the new log entry.
+//    async_overflow_policy::discard_log_msg - never block and discard any new messages when queue  overflows.
+//
+// worker_warmup_cb (optional):
+//     callback function that will be called in worker thread upon start (can be used to init stuff like thread affinity)
+//
+void set_async_mode(size_t queue_size, const async_overflow_policy overflow_policy = async_overflow_policy::block_retry, const std::function<void()>& worker_warmup_cb = nullptr, const std::chrono::milliseconds& flush_interval_ms = std::chrono::milliseconds{0});
+
+// Turn off async mode
+void set_sync_mode();
+
+//
+// Create and register multi/single threaded rotating file logger
+//
+std::shared_ptr<logger> rotating_logger_mt(const std::string& logger_name, const filename_t& filename, size_t max_file_size, size_t max_files, bool force_flush = false);
+std::shared_ptr<logger> rotating_logger_st(const std::string& logger_name, const filename_t& filename, size_t max_file_size, size_t max_files, bool force_flush = false);
+
+//
+// Create file logger which creates new file on the given time (default in  midnight):
+//
+std::shared_ptr<logger> daily_logger_mt(const std::string& logger_name, const filename_t& filename, int hour=0, int minute=0, bool force_flush = false);
+std::shared_ptr<logger> daily_logger_st(const std::string& logger_name, const filename_t& filename, int hour=0, int minute=0, bool force_flush = false);
+
+//
+// Create and register stdout/stderr loggers
+//
+std::shared_ptr<logger> stdout_logger_mt(const std::string& logger_name, bool color = false);
+std::shared_ptr<logger> stdout_logger_st(const std::string& logger_name, bool color = false);
+std::shared_ptr<logger> stderr_logger_mt(const std::string& logger_name, bool color = false);
+std::shared_ptr<logger> stderr_logger_st(const std::string& logger_name, bool color = false);
+
+
+//
+// Create and register a syslog logger
+//
+#if defined(__linux__) || defined(__APPLE__)
+std::shared_ptr<logger> syslog_logger(const std::string& logger_name, const std::string& ident = "", int syslog_option = 0);
+#endif
+
+
+// Create and register a logger with multiple sinks
+std::shared_ptr<logger> create(const std::string& logger_name, sinks_init_list sinks);
+template<class It>
+std::shared_ptr<logger> create(const std::string& logger_name, const It& sinks_begin, const It& sinks_end);
+
+
+// Create and register a logger with templated sink type
+// Example: spdlog::create<daily_file_sink_st>("mylog", "dailylog_filename", "txt");
+template <typename Sink, typename... Args>
+std::shared_ptr<spdlog::logger> create(const std::string& logger_name, Args...);
+
+
+// Register the given logger with the given name
+void register_logger(std::shared_ptr<logger> logger);
+
+// Drop the reference to the given logger
+void drop(const std::string &name);
+
+// Drop all references
+void drop_all();
+
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// Macros to be display source file & line
+// Trace & Debug can be switched on/off at compile time for zero cost debug statements.
+// Uncomment SPDLOG_DEBUG_ON/SPDLOG_TRACE_ON in teakme.h to enable.
+//
+// Example:
+// spdlog::set_level(spdlog::level::debug);
+// SPDLOG_DEBUG(my_logger, "Some debug message {} {}", 1, 3.2);
+///////////////////////////////////////////////////////////////////////////////
+
+#ifdef SPDLOG_TRACE_ON
+#define SPDLOG_TRACE(logger, ...) logger->trace(__VA_ARGS__) << " (" << __FILE__ << " #" << __LINE__ <<")";
+#else
+#define SPDLOG_TRACE(logger, ...)
+#endif
+
+#ifdef SPDLOG_DEBUG_ON
+#define SPDLOG_DEBUG(logger, ...) logger->debug(__VA_ARGS__)  << " (" << __FILE__ << " #" << __LINE__ <<")";
+#else
+#define SPDLOG_DEBUG(logger, ...)
+#endif
+
+
+}
+
+
+#include <spdlog/details/spdlog_impl.h>

src/spdlog/tweakme.h

@@ -0,0 +1,65 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+//
+// Edit this file to squeeze every last drop of performance out of spdlog.
+//
+
+///////////////////////////////////////////////////////////////////////////////
+// Under Linux, the much faster CLOCK_REALTIME_COARSE clock can be used.
+// This clock is less accurate - can be off by dozens of millis - depending on the kernel HZ.
+// Uncomment to use it instead of the regular (but slower) clock.
+// #define SPDLOG_CLOCK_COARSE
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment if date/time logging is not needed.
+// This will prevent spdlog from quering the clock on each log call.
+// #define SPDLOG_NO_DATETIME
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment if thread id logging is not needed (i.e. no %t in the log pattern).
+// This will prevent spdlog from quering the thread id on each log call.
+// #define SPDLOG_NO_THREAD_ID
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment if logger name logging is not needed.
+// This will prevent spdlog from copying the logger name  on each log call.
+// #define SPDLOG_NO_NAME
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable the SPDLOG_DEBUG/SPDLOG_TRACE macros.
+// #define SPDLOG_DEBUG_ON
+// #define SPDLOG_TRACE_ON
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to avoid locking in the registry operations (spdlog::get(), spdlog::drop() spdlog::register()).
+// Use only if your code never modifes concurrently the registry.
+// Note that upon creating a logger the registry is modified by spdlog..
+// #define SPDLOG_NO_REGISTRY_MUTEX
+///////////////////////////////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to avoid spdlog's usage of atomic log levels
+// Use only if your code never modifies a logger's log levels concurrently.
+// #define SPDLOG_NO_ATOMIC_LEVELS
+///////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to enable usage of wchar_t for file names on Windows.
+// #define SPDLOG_WCHAR_FILENAMES
+///////////////////////////////////////////////////////////////////////////////