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// (C) Copyright 2012 Vicente J. Botet Escriba
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_THREAD_EXTERNALLY_LOCKED_STREAM_HPP
#define BOOST_THREAD_EXTERNALLY_LOCKED_STREAM_HPP
#include <boost/thread/detail/config.hpp>
#include <boost/thread/detail/move.hpp>
#include <boost/thread/detail/delete.hpp>
#include <boost/thread/externally_locked.hpp>
#include <boost/thread/lock_traits.hpp>
#include <boost/thread/recursive_mutex.hpp>
#include <boost/thread/strict_lock.hpp>
#include <boost/config/abi_prefix.hpp>
namespace boost
{
template <typename Stream, typename RecursiveMutex=recursive_mutex>
class externally_locked_stream;
template <class Stream, typename RecursiveMutex=recursive_mutex>
class stream_guard
{
friend class externally_locked_stream<Stream, RecursiveMutex> ;
public:
typedef typename externally_locked_stream<Stream, RecursiveMutex>::mutex_type mutex_type;
BOOST_THREAD_MOVABLE_ONLY( stream_guard)
stream_guard(externally_locked_stream<Stream, RecursiveMutex>& mtx) :
mtx_(&mtx)
{
mtx.lock();
}
stream_guard(externally_locked_stream<Stream, RecursiveMutex>& mtx, adopt_lock_t) :
mtx_(&mtx)
{
}
stream_guard(BOOST_THREAD_RV_REF(stream_guard) rhs) BOOST_NOEXCEPT
: mtx_(rhs.mtx_)
{
rhs.mtx_= 0;
}
~stream_guard()
{
if (mtx_ != 0) mtx_->unlock();
}
bool owns_lock(const mutex_type * l) const BOOST_NOEXCEPT
{
return l == mtx_->mutex();
}
/**
* @Requires mtx_
*/
Stream& get() const
{
BOOST_THREAD_ASSERT_PRECONDITION( mtx_, lock_error() );
return mtx_->get(*this);
}
Stream& bypass() const
{
return get();
}
private:
externally_locked_stream<Stream, RecursiveMutex>* mtx_;
};
template <typename Stream, typename RecursiveMutex>
struct is_strict_lock_sur_parole<stream_guard<Stream, RecursiveMutex> > : true_type
{
};
/**
* externally_locked_stream cloaks a reference to an stream of type Stream, and actually
* provides full access to that object through the get and set member functions, provided you
* pass a reference to a strict lock object.
*/
//[externally_locked_stream
template <typename Stream, typename RecursiveMutex>
class externally_locked_stream: public externally_locked<Stream&, RecursiveMutex>
{
typedef externally_locked<Stream&, RecursiveMutex> base_type;
public:
BOOST_THREAD_NO_COPYABLE( externally_locked_stream)
/**
* Effects: Constructs an externally locked object storing the cloaked reference object.
*/
externally_locked_stream(Stream& stream, RecursiveMutex& mtx) BOOST_NOEXCEPT :
base_type(stream, mtx)
{
}
stream_guard<Stream, RecursiveMutex> hold() BOOST_NOEXCEPT
{
return stream_guard<Stream, RecursiveMutex> (*this);
}
Stream& bypass() const
{
stream_guard<Stream, RecursiveMutex> lk(*this);
return get(lk);
}
};
//]
template <typename Stream, typename RecursiveMutex, typename T>
inline const stream_guard<Stream, RecursiveMutex>& operator<<(const stream_guard<Stream, RecursiveMutex>& lck, T arg)
{
lck.get() << arg;
return lck;
}
template <typename Stream, typename RecursiveMutex>
inline const stream_guard<Stream, RecursiveMutex>& operator<<(const stream_guard<Stream, RecursiveMutex>& lck, Stream& (*arg)(Stream&))
{
lck.get() << arg;
return lck;
}
template <typename Stream, typename RecursiveMutex, typename T>
inline const stream_guard<Stream, RecursiveMutex>& operator>>(const stream_guard<Stream, RecursiveMutex>& lck, T& arg)
{
lck.get() >> arg;
return lck;
}
template <typename Stream, typename RecursiveMutex, typename T>
inline stream_guard<Stream, RecursiveMutex> operator<<(externally_locked_stream<Stream, RecursiveMutex>& mtx, T arg)
{
stream_guard<Stream, RecursiveMutex> lk(mtx);
mtx.get(lk) << arg;
return boost::move(lk);
}
template <typename Stream, typename RecursiveMutex>
inline stream_guard<Stream, RecursiveMutex> operator<<(externally_locked_stream<Stream, RecursiveMutex>& mtx, Stream& (*arg)(Stream&))
{
stream_guard<Stream, RecursiveMutex> lk(mtx);
mtx.get(lk) << arg;
return boost::move(lk);
}
template <typename Stream, typename RecursiveMutex, typename T>
inline stream_guard<Stream, RecursiveMutex> operator>>(externally_locked_stream<Stream, RecursiveMutex>& mtx, T& arg)
{
stream_guard<Stream, RecursiveMutex> lk(mtx);
mtx.get(lk) >> arg;
return boost::move(lk);
}
}
#include <boost/config/abi_suffix.hpp>
#endif // header
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