mirror of
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743 lines
26 KiB
C++
743 lines
26 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file basic_logger.hpp
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* \author Andrey Semashev
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* \date 08.03.2007
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*
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* The header contains implementation of a base class for loggers. Convenience macros
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* for defining custom loggers are also provided.
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*/
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#ifndef BOOST_LOG_SOURCES_BASIC_LOGGER_HPP_INCLUDED_
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#define BOOST_LOG_SOURCES_BASIC_LOGGER_HPP_INCLUDED_
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#include <exception>
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#include <utility>
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#include <ostream>
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#include <boost/assert.hpp>
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#include <boost/move/core.hpp>
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#include <boost/move/utility_core.hpp>
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#include <boost/core/addressof.hpp>
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#include <boost/preprocessor/facilities/empty.hpp>
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#include <boost/preprocessor/facilities/identity.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/preprocessor/seq/enum.hpp>
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#include <boost/log/detail/config.hpp>
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#include <boost/log/detail/parameter_tools.hpp>
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#include <boost/log/attributes/attribute_set.hpp>
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#include <boost/log/attributes/attribute_name.hpp>
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#include <boost/log/attributes/attribute.hpp>
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#include <boost/log/core/core.hpp>
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#include <boost/log/core/record.hpp>
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#include <boost/log/sources/features.hpp>
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#include <boost/log/sources/threading_models.hpp>
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace sources {
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/*!
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* \brief Basic logger class
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*
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* The \c basic_logger class template serves as a base class for all loggers
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* provided by the library. It can also be used as a base for user-defined
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* loggers. The template parameters are:
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*
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* \li \c CharT - logging character type
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* \li \c FinalT - final type of the logger that eventually derives from
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* the \c basic_logger. There may be other classes in the hierarchy
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* between the final class and \c basic_logger.
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* \li \c ThreadingModelT - threading model policy. Must provide methods
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* of the Boost.Thread locking concept used in \c basic_logger class
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* and all its derivatives in the hierarchy up to the \c FinalT class.
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* The \c basic_logger class itself requires methods of the
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* SharedLockable concept. The threading model policy must also be
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* default and copy-constructible and support member function \c swap.
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* There are currently two policies provided: \c single_thread_model
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* and \c multi_thread_model.
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*
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* The logger implements fundamental facilities of loggers, such as storing
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* source-specific attribute set and formatting log record messages. The basic
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* logger interacts with the logging core in order to apply filtering and
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* pass records to sinks.
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*/
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template< typename CharT, typename FinalT, typename ThreadingModelT >
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class basic_logger :
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public ThreadingModelT
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{
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typedef basic_logger this_type;
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BOOST_COPYABLE_AND_MOVABLE_ALT(this_type)
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public:
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//! Character type
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typedef CharT char_type;
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//! Final logger type
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typedef FinalT final_type;
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//! Threading model type
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typedef ThreadingModelT threading_model;
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#if !defined(BOOST_LOG_NO_THREADS)
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//! Lock requirement for the swap_unlocked method
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typedef boost::log::aux::exclusive_lock_guard< threading_model > swap_lock;
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//! Lock requirement for the add_attribute_unlocked method
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typedef boost::log::aux::exclusive_lock_guard< threading_model > add_attribute_lock;
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//! Lock requirement for the remove_attribute_unlocked method
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typedef boost::log::aux::exclusive_lock_guard< threading_model > remove_attribute_lock;
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//! Lock requirement for the remove_all_attributes_unlocked method
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typedef boost::log::aux::exclusive_lock_guard< threading_model > remove_all_attributes_lock;
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//! Lock requirement for the get_attributes method
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typedef boost::log::aux::shared_lock_guard< const threading_model > get_attributes_lock;
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//! Lock requirement for the open_record_unlocked method
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typedef boost::log::aux::shared_lock_guard< threading_model > open_record_lock;
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//! Lock requirement for the set_attributes method
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typedef boost::log::aux::exclusive_lock_guard< threading_model > set_attributes_lock;
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#else
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typedef no_lock< threading_model > swap_lock;
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typedef no_lock< threading_model > add_attribute_lock;
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typedef no_lock< threading_model > remove_attribute_lock;
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typedef no_lock< threading_model > remove_all_attributes_lock;
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typedef no_lock< const threading_model > get_attributes_lock;
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typedef no_lock< threading_model > open_record_lock;
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typedef no_lock< threading_model > set_attributes_lock;
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#endif
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//! Lock requirement for the push_record_unlocked method
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typedef no_lock< threading_model > push_record_lock;
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private:
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//! A pointer to the logging system
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core_ptr m_pCore;
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//! Logger-specific attribute set
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attribute_set m_Attributes;
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public:
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/*!
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* Constructor. Initializes internal data structures of the basic logger class,
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* acquires reference to the logging core.
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*/
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basic_logger() :
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threading_model(),
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m_pCore(core::get())
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{
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}
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/*!
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* Copy constructor. Copies all attributes from the source logger.
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*
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* \note Not thread-safe. The source logger must be locked in the final class before copying.
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*
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* \param that Source logger
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*/
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basic_logger(basic_logger const& that) :
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threading_model(static_cast< threading_model const& >(that)),
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m_pCore(core::get()),
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m_Attributes(that.m_Attributes)
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{
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}
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/*!
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* Move constructor. Moves all attributes from the source logger.
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*
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* \note Not thread-safe. The source logger must be locked in the final class before copying.
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*
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* \param that Source logger
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*/
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basic_logger(BOOST_RV_REF(basic_logger) that) :
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threading_model(boost::move(static_cast< threading_model& >(that)))
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{
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m_pCore.swap(that.m_pCore);
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m_Attributes.swap(that.m_Attributes);
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}
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/*!
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* Constructor with named arguments. The constructor ignores all arguments. The result of
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* construction is equivalent to default construction.
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*/
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template< typename ArgsT >
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explicit basic_logger(ArgsT const&) :
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threading_model(),
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m_pCore(core::get())
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{
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}
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protected:
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/*!
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* An accessor to the logging system pointer
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*/
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core_ptr const& core() const { return m_pCore; }
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/*!
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* An accessor to the logger attributes
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*/
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attribute_set& attributes() { return m_Attributes; }
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/*!
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* An accessor to the logger attributes
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*/
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attribute_set const& attributes() const { return m_Attributes; }
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/*!
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* An accessor to the threading model base
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*/
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threading_model& get_threading_model() { return *this; }
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/*!
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* An accessor to the threading model base
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*/
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threading_model const& get_threading_model() const { return *this; }
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/*!
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* An accessor to the final logger
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*/
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final_type* final_this()
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{
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BOOST_LOG_ASSUME(this != NULL);
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return static_cast< final_type* >(this);
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}
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/*!
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* An accessor to the final logger
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*/
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final_type const* final_this() const
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{
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BOOST_LOG_ASSUME(this != NULL);
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return static_cast< final_type const* >(this);
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}
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/*!
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* Unlocked \c swap
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*/
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void swap_unlocked(basic_logger& that)
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{
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get_threading_model().swap(that.get_threading_model());
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m_Attributes.swap(that.m_Attributes);
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}
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/*!
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* Unlocked \c add_attribute
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*/
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std::pair< attribute_set::iterator, bool > add_attribute_unlocked(attribute_name const& name, attribute const& attr)
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{
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return m_Attributes.insert(name, attr);
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}
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/*!
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* Unlocked \c remove_attribute
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*/
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void remove_attribute_unlocked(attribute_set::iterator it)
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{
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m_Attributes.erase(it);
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}
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/*!
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* Unlocked \c remove_all_attributes
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*/
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void remove_all_attributes_unlocked()
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{
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m_Attributes.clear();
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}
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/*!
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* Unlocked \c open_record
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*/
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record open_record_unlocked()
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{
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return m_pCore->open_record(m_Attributes);
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}
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/*!
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* Unlocked \c open_record
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*/
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template< typename ArgsT >
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record open_record_unlocked(ArgsT const&)
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{
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return m_pCore->open_record(m_Attributes);
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}
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/*!
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* Unlocked \c push_record
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*/
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void push_record_unlocked(BOOST_RV_REF(record) rec)
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{
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m_pCore->push_record(boost::move(rec));
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}
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/*!
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* Unlocked \c get_attributes
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*/
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attribute_set get_attributes_unlocked() const
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{
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return m_Attributes;
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}
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/*!
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* Unlocked \c set_attributes
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*/
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void set_attributes_unlocked(attribute_set const& attrs)
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{
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m_Attributes = attrs;
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}
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//! Assignment is closed (should be implemented through copy and swap in the final class)
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BOOST_DELETED_FUNCTION(basic_logger& operator= (basic_logger const&))
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};
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/*!
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* Free-standing swap for all loggers
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*/
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template< typename CharT, typename FinalT, typename ThreadingModelT >
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inline void swap(
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basic_logger< CharT, FinalT, ThreadingModelT >& left,
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basic_logger< CharT, FinalT, ThreadingModelT >& right)
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{
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static_cast< FinalT& >(left).swap(static_cast< FinalT& >(right));
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}
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/*!
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* \brief A composite logger that inherits a number of features
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*
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* The composite logger is a helper class that simplifies feature composition into the final logger.
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* The user's logger class is expected to derive from the composite logger class, instantiated with
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* the character type, the user's logger class, the threading model and the list of the required features.
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* The former three parameters are passed to the \c basic_logger class template. The feature list
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* must be an MPL type sequence, where each element is a unary MPL metafunction class, that upon
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* applying on its argument results in a logging feature class that derives from the argument.
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* Every logger feature provided by the library can participate in the feature list.
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*/
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template< typename CharT, typename FinalT, typename ThreadingModelT, typename FeaturesT >
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class basic_composite_logger :
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public boost::log::sources::aux::inherit_features<
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basic_logger< CharT, FinalT, ThreadingModelT >,
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FeaturesT
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>::type
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{
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private:
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//! Base type (the hierarchy of features)
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typedef typename boost::log::sources::aux::inherit_features<
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basic_logger< CharT, FinalT, ThreadingModelT >,
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FeaturesT
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>::type base_type;
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protected:
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//! The composite logger type (for use in the user's logger class)
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typedef basic_composite_logger logger_base;
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BOOST_COPYABLE_AND_MOVABLE_ALT(logger_base)
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public:
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//! Threading model being used
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typedef typename base_type::threading_model threading_model;
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#if !defined(BOOST_LOG_NO_THREADS)
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public:
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/*!
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* Default constructor (default-constructs all features)
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*/
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basic_composite_logger() {}
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/*!
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* Copy constructor
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*/
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basic_composite_logger(basic_composite_logger const& that) :
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base_type
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((
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boost::log::aux::shared_lock_guard< const threading_model >(that.get_threading_model()),
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static_cast< base_type const& >(that)
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))
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{
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}
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/*!
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* Move constructor
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*/
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basic_composite_logger(BOOST_RV_REF(logger_base) that) :
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base_type(boost::move(static_cast< base_type& >(that)))
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{
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}
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/*!
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* Constructor with named parameters
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*/
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template< typename ArgsT >
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explicit basic_composite_logger(ArgsT const& args) : base_type(args)
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{
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}
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/*!
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* The method adds an attribute to the source-specific attribute set. The attribute will be implicitly added to
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* every log record made with the current logger.
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*
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* \param name The attribute name.
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* \param attr The attribute factory.
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* \return A pair of values. If the second member is \c true, then the attribute is added and the first member points to the
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* attribute. Otherwise the attribute was not added and the first member points to the attribute that prevents
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* addition.
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*/
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std::pair< attribute_set::iterator, bool > add_attribute(attribute_name const& name, attribute const& attr)
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{
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typename base_type::add_attribute_lock lock(base_type::get_threading_model());
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return base_type::add_attribute_unlocked(name, attr);
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}
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/*!
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* The method removes an attribute from the source-specific attribute set.
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*
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* \pre The attribute was added with the add_attribute call for this instance of the logger.
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* \post The attribute is no longer registered as a source-specific attribute for this logger. The iterator is invalidated after removal.
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*
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* \param it Iterator to the previously added attribute.
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*/
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void remove_attribute(attribute_set::iterator it)
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{
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typename base_type::remove_attribute_lock lock(base_type::get_threading_model());
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base_type::remove_attribute_unlocked(it);
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}
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/*!
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* The method removes all attributes from the logger. All iterators and references to the removed attributes are invalidated.
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*/
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void remove_all_attributes()
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{
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typename base_type::remove_all_attributes_lock lock(base_type::get_threading_model());
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base_type::remove_all_attributes_unlocked();
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}
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/*!
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* The method retrieves a copy of a set with all attributes from the logger.
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*
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* \return The copy of the attribute set. Attributes are shallow-copied.
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*/
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attribute_set get_attributes() const
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{
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typename base_type::get_attributes_lock lock(base_type::get_threading_model());
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return base_type::get_attributes_unlocked();
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}
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/*!
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* The method installs the whole attribute set into the logger. All iterators and references to elements of
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* the previous set are invalidated. Iterators to the \a attrs set are not valid to be used with the logger (that is,
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* the logger owns a copy of \a attrs after completion).
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*
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* \param attrs The set of attributes to install into the logger. Attributes are shallow-copied.
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*/
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void set_attributes(attribute_set const& attrs)
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{
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typename base_type::set_attributes_lock lock(base_type::get_threading_model());
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base_type::set_attributes_unlocked(attrs);
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}
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/*!
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* The method opens a new log record in the logging core.
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*
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* \return A valid record handle if the logging record is opened successfully, an invalid handle otherwise.
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*/
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record open_record()
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{
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// Perform a quick check first
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if (this->core()->get_logging_enabled())
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{
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typename base_type::open_record_lock lock(base_type::get_threading_model());
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return base_type::open_record_unlocked(boost::log::aux::empty_arg_list());
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}
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else
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return record();
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}
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/*!
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* The method opens a new log record in the logging core.
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*
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* \param args A set of additional named arguments. The parameter is ignored.
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* \return A valid record handle if the logging record is opened successfully, an invalid handle otherwise.
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*/
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template< typename ArgsT >
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record open_record(ArgsT const& args)
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{
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// Perform a quick check first
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if (this->core()->get_logging_enabled())
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{
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typename base_type::open_record_lock lock(base_type::get_threading_model());
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return base_type::open_record_unlocked(args);
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}
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else
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return record();
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}
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/*!
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* The method pushes the constructed message to the logging core
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*
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* \param rec The log record with the formatted message
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*/
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void push_record(BOOST_RV_REF(record) rec)
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{
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typename base_type::push_record_lock lock(base_type::get_threading_model());
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base_type::push_record_unlocked(boost::move(rec));
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}
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/*!
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* Thread-safe implementation of swap
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*/
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void swap(basic_composite_logger& that)
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{
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boost::log::aux::multiple_unique_lock2<
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threading_model,
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threading_model
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> lock(base_type::get_threading_model(), that.get_threading_model());
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base_type::swap_unlocked(that);
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}
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protected:
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/*!
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* Assignment for the final class. Threadsafe, provides strong exception guarantee.
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*/
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FinalT& assign(FinalT const& that)
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{
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BOOST_LOG_ASSUME(this != NULL);
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if (static_cast< FinalT* >(this) != boost::addressof(that))
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{
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// We'll have to explicitly create the copy in order to make sure it's unlocked when we attempt to lock *this
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FinalT tmp(that);
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boost::log::aux::exclusive_lock_guard< threading_model > lock(base_type::get_threading_model());
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base_type::swap_unlocked(tmp);
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}
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return static_cast< FinalT& >(*this);
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}
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};
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|
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//! An optimized composite logger version with no multithreading support
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template< typename CharT, typename FinalT, typename FeaturesT >
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class basic_composite_logger< CharT, FinalT, single_thread_model, FeaturesT > :
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public boost::log::sources::aux::inherit_features<
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basic_logger< CharT, FinalT, single_thread_model >,
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FeaturesT
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>::type
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{
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private:
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typedef typename boost::log::sources::aux::inherit_features<
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basic_logger< CharT, FinalT, single_thread_model >,
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FeaturesT
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>::type base_type;
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protected:
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typedef basic_composite_logger logger_base;
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BOOST_COPYABLE_AND_MOVABLE_ALT(logger_base)
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public:
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typedef typename base_type::threading_model threading_model;
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#endif // !defined(BOOST_LOG_NO_THREADS)
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public:
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basic_composite_logger() {}
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basic_composite_logger(basic_composite_logger const& that) :
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base_type(static_cast< base_type const& >(that))
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{
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}
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basic_composite_logger(BOOST_RV_REF(logger_base) that) :
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base_type(boost::move(static_cast< base_type& >(that)))
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{
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}
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template< typename ArgsT >
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explicit basic_composite_logger(ArgsT const& args) : base_type(args)
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{
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}
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std::pair< attribute_set::iterator, bool > add_attribute(attribute_name const& name, attribute const& attr)
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{
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return base_type::add_attribute_unlocked(name, attr);
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}
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void remove_attribute(attribute_set::iterator it)
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{
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base_type::remove_attribute_unlocked(it);
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}
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void remove_all_attributes()
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{
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base_type::remove_all_attributes_unlocked();
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}
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attribute_set get_attributes() const
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{
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return base_type::get_attributes_unlocked();
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}
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void set_attributes(attribute_set const& attrs)
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{
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base_type::set_attributes_unlocked(attrs);
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}
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record open_record()
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{
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// Perform a quick check first
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if (this->core()->get_logging_enabled())
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return base_type::open_record_unlocked(boost::log::aux::empty_arg_list());
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else
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return record();
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}
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template< typename ArgsT >
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record open_record(ArgsT const& args)
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{
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// Perform a quick check first
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if (this->core()->get_logging_enabled())
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return base_type::open_record_unlocked(args);
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else
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return record();
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}
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void push_record(BOOST_RV_REF(record) rec)
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{
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base_type::push_record_unlocked(boost::move(rec));
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}
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void swap(basic_composite_logger& that)
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{
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base_type::swap_unlocked(that);
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}
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protected:
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FinalT& assign(FinalT that)
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{
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base_type::swap_unlocked(that);
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return static_cast< FinalT& >(*this);
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}
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};
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#ifndef BOOST_LOG_DOXYGEN_PASS
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#define BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_IMPL(class_type, typename_keyword)\
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public:\
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BOOST_DEFAULTED_FUNCTION(class_type(), {})\
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class_type(class_type const& that) : class_type::logger_base(\
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static_cast< typename_keyword() class_type::logger_base const& >(that)) {}\
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class_type(BOOST_RV_REF(class_type) that) : class_type::logger_base(\
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::boost::move(static_cast< typename_keyword() class_type::logger_base& >(that))) {}\
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BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_FORWARD(class_type, class_type::logger_base)\
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#endif // BOOST_LOG_DOXYGEN_PASS
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#define BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS(class_type)\
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BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_IMPL(class_type, BOOST_PP_EMPTY)
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#define BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_TEMPLATE(class_type)\
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BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_IMPL(class_type, BOOST_PP_IDENTITY(typename))
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#define BOOST_LOG_FORWARD_LOGGER_ASSIGNMENT(class_type)\
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public:\
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class_type& operator= (BOOST_COPY_ASSIGN_REF(class_type) that)\
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{\
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return class_type::logger_base::assign(static_cast< class_type const& >(that));\
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}\
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class_type& operator= (BOOST_RV_REF(class_type) that)\
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{\
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BOOST_LOG_EXPR_IF_MT(::boost::log::aux::exclusive_lock_guard< class_type::threading_model > lock(this->get_threading_model());)\
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this->swap_unlocked(that);\
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return *this;\
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}
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#define BOOST_LOG_FORWARD_LOGGER_ASSIGNMENT_TEMPLATE(class_type)\
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public:\
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class_type& operator= (BOOST_COPY_ASSIGN_REF(class_type) that)\
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{\
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return class_type::logger_base::assign(static_cast< class_type const& >(that));\
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}\
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class_type& operator= (BOOST_RV_REF(class_type) that)\
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{\
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BOOST_LOG_EXPR_IF_MT(::boost::log::aux::exclusive_lock_guard< typename class_type::threading_model > lock(this->get_threading_model());)\
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this->swap_unlocked(that);\
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return *this;\
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}
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#define BOOST_LOG_FORWARD_LOGGER_MEMBERS(class_type)\
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BOOST_COPYABLE_AND_MOVABLE(class_type)\
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BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS(class_type)\
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BOOST_LOG_FORWARD_LOGGER_ASSIGNMENT(class_type)
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#define BOOST_LOG_FORWARD_LOGGER_MEMBERS_TEMPLATE(class_type)\
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BOOST_COPYABLE_AND_MOVABLE(class_type)\
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BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS_TEMPLATE(class_type)\
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BOOST_LOG_FORWARD_LOGGER_ASSIGNMENT_TEMPLATE(class_type)
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} // namespace sources
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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/*!
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* \brief The macro declares a logger class that inherits a number of base classes
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*
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* \param type_name The name of the logger class to declare
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* \param char_type The character type of the logger. Either char or wchar_t expected.
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* \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
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* \param threading A threading model class
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*/
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#define BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char_type, base_seq, threading)\
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class type_name :\
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public ::boost::log::sources::basic_composite_logger<\
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char_type,\
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type_name,\
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threading,\
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::boost::log::sources::features< BOOST_PP_SEQ_ENUM(base_seq) >\
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|
>\
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{\
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BOOST_LOG_FORWARD_LOGGER_MEMBERS(type_name)\
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|
}
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|
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#ifdef BOOST_LOG_USE_CHAR
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/*!
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* \brief The macro declares a narrow-char logger class that inherits a number of base classes
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|
*
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* Equivalent to BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char, base_seq, single_thread_model)
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|
*
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|
* \param type_name The name of the logger class to declare
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* \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
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|
*/
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#define BOOST_LOG_DECLARE_LOGGER(type_name, base_seq)\
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BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char, base_seq, ::boost::log::sources::single_thread_model)
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|
#if !defined(BOOST_LOG_NO_THREADS)
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|
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|
/*!
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|
* \brief The macro declares a narrow-char thread-safe logger class that inherits a number of base classes
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|
*
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|
* Equivalent to <tt>BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char, base_seq, multi_thread_model< shared_mutex >)</tt>
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|
*
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|
* \param type_name The name of the logger class to declare
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|
* \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
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|
*/
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|
#define BOOST_LOG_DECLARE_LOGGER_MT(type_name, base_seq)\
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|
BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char, base_seq,\
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::boost::log::sources::multi_thread_model< ::boost::shared_mutex >)
|
|
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|
#endif // !defined(BOOST_LOG_NO_THREADS)
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|
#endif // BOOST_LOG_USE_CHAR
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|
#ifdef BOOST_LOG_USE_WCHAR_T
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|
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|
/*!
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|
* \brief The macro declares a wide-char logger class that inherits a number of base classes
|
|
*
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|
* Equivalent to BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, wchar_t, base_seq, single_thread_model)
|
|
*
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|
* \param type_name The name of the logger class to declare
|
|
* \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
|
|
*/
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|
#define BOOST_LOG_DECLARE_WLOGGER(type_name, base_seq)\
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|
BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, wchar_t, base_seq, ::boost::log::sources::single_thread_model)
|
|
|
|
#if !defined(BOOST_LOG_NO_THREADS)
|
|
|
|
/*!
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|
* \brief The macro declares a wide-char thread-safe logger class that inherits a number of base classes
|
|
*
|
|
* Equivalent to <tt>BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, wchar_t, base_seq, multi_thread_model< shared_mutex >)</tt>
|
|
*
|
|
* \param type_name The name of the logger class to declare
|
|
* \param base_seq A Boost.Preprocessor sequence of type identifiers of the base classes templates
|
|
*/
|
|
#define BOOST_LOG_DECLARE_WLOGGER_MT(type_name, base_seq)\
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|
BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, wchar_t, base_seq,\
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|
::boost::log::sources::multi_thread_model< ::boost::shared_mutex >)
|
|
|
|
#endif // !defined(BOOST_LOG_NO_THREADS)
|
|
#endif // BOOST_LOG_USE_WCHAR_T
|
|
|
|
#include <boost/log/detail/footer.hpp>
|
|
|
|
#endif // BOOST_LOG_SOURCES_BASIC_LOGGER_HPP_INCLUDED_
|