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171 lines
4.8 KiB
C++
171 lines
4.8 KiB
C++
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// (C) Copyright 2012 Vicente J. Botet Escriba
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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#ifndef BOOST_THREAD_EXTERNALLY_LOCKED_STREAM_HPP
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#define BOOST_THREAD_EXTERNALLY_LOCKED_STREAM_HPP
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#include <boost/thread/detail/config.hpp>
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#include <boost/thread/detail/move.hpp>
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#include <boost/thread/detail/delete.hpp>
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#include <boost/thread/externally_locked.hpp>
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#include <boost/thread/lock_traits.hpp>
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#include <boost/thread/recursive_mutex.hpp>
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#include <boost/thread/strict_lock.hpp>
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#include <boost/config/abi_prefix.hpp>
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namespace boost
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{
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template <typename Stream, typename RecursiveMutex=recursive_mutex>
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class externally_locked_stream;
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template <class Stream, typename RecursiveMutex=recursive_mutex>
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class stream_guard
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{
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friend class externally_locked_stream<Stream, RecursiveMutex> ;
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public:
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typedef typename externally_locked_stream<Stream, RecursiveMutex>::mutex_type mutex_type;
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BOOST_THREAD_MOVABLE_ONLY( stream_guard)
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stream_guard(externally_locked_stream<Stream, RecursiveMutex>& mtx) :
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mtx_(&mtx)
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{
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mtx.lock();
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}
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stream_guard(externally_locked_stream<Stream, RecursiveMutex>& mtx, adopt_lock_t) :
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mtx_(&mtx)
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{
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}
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stream_guard(BOOST_THREAD_RV_REF(stream_guard) rhs) BOOST_NOEXCEPT
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: mtx_(rhs.mtx_)
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{
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rhs.mtx_= 0;
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}
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~stream_guard()
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{
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if (mtx_ != 0) mtx_->unlock();
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}
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bool owns_lock(const mutex_type * l) const BOOST_NOEXCEPT
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{
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return l == mtx_->mutex();
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}
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/**
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* @Requires mtx_
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*/
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Stream& get() const
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{
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BOOST_THREAD_ASSERT_PRECONDITION( mtx_, lock_error() );
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return mtx_->get(*this);
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}
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Stream& bypass() const
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{
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return get();
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}
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private:
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externally_locked_stream<Stream, RecursiveMutex>* mtx_;
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};
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template <typename Stream, typename RecursiveMutex>
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struct is_strict_lock_sur_parole<stream_guard<Stream, RecursiveMutex> > : true_type
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{
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};
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/**
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* externally_locked_stream cloaks a reference to an stream of type Stream, and actually
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* provides full access to that object through the get and set member functions, provided you
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* pass a reference to a strict lock object.
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*/
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//[externally_locked_stream
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template <typename Stream, typename RecursiveMutex>
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class externally_locked_stream: public externally_locked<Stream&, RecursiveMutex>
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{
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typedef externally_locked<Stream&, RecursiveMutex> base_type;
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public:
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BOOST_THREAD_NO_COPYABLE( externally_locked_stream)
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/**
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* Effects: Constructs an externally locked object storing the cloaked reference object.
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*/
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externally_locked_stream(Stream& stream, RecursiveMutex& mtx) BOOST_NOEXCEPT :
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base_type(stream, mtx)
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{
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}
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stream_guard<Stream, RecursiveMutex> hold() BOOST_NOEXCEPT
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{
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return stream_guard<Stream, RecursiveMutex> (*this);
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}
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Stream& bypass() const
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{
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stream_guard<Stream, RecursiveMutex> lk(*this);
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return get(lk);
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}
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};
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//]
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template <typename Stream, typename RecursiveMutex, typename T>
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inline const stream_guard<Stream, RecursiveMutex>& operator<<(const stream_guard<Stream, RecursiveMutex>& lck, T arg)
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{
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lck.get() << arg;
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return lck;
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}
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template <typename Stream, typename RecursiveMutex>
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inline const stream_guard<Stream, RecursiveMutex>& operator<<(const stream_guard<Stream, RecursiveMutex>& lck, Stream& (*arg)(Stream&))
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{
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lck.get() << arg;
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return lck;
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}
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template <typename Stream, typename RecursiveMutex, typename T>
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inline const stream_guard<Stream, RecursiveMutex>& operator>>(const stream_guard<Stream, RecursiveMutex>& lck, T& arg)
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{
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lck.get() >> arg;
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return lck;
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}
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template <typename Stream, typename RecursiveMutex, typename T>
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inline stream_guard<Stream, RecursiveMutex> operator<<(externally_locked_stream<Stream, RecursiveMutex>& mtx, T arg)
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{
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stream_guard<Stream, RecursiveMutex> lk(mtx);
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mtx.get(lk) << arg;
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return boost::move(lk);
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}
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template <typename Stream, typename RecursiveMutex>
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inline stream_guard<Stream, RecursiveMutex> operator<<(externally_locked_stream<Stream, RecursiveMutex>& mtx, Stream& (*arg)(Stream&))
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{
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stream_guard<Stream, RecursiveMutex> lk(mtx);
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mtx.get(lk) << arg;
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return boost::move(lk);
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}
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template <typename Stream, typename RecursiveMutex, typename T>
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inline stream_guard<Stream, RecursiveMutex> operator>>(externally_locked_stream<Stream, RecursiveMutex>& mtx, T& arg)
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{
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stream_guard<Stream, RecursiveMutex> lk(mtx);
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mtx.get(lk) >> arg;
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return boost::move(lk);
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}
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}
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#include <boost/config/abi_suffix.hpp>
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#endif // header
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