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//////////////////////////////////////////////////////////////////////////////
//
// This file is the adaptation for Interprocess of boost/enable_shared_from_this.hpp
//
// (C) Copyright Peter Dimov 2002
// (C) Copyright Ion Gaztanaga 2006-2012. 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)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
#define BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
#ifndef BOOST_CONFIG_HPP
# include <boost/config.hpp>
#endif
#
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <boost/assert.hpp>
#include <boost/interprocess/smart_ptr/weak_ptr.hpp>
#include <boost/interprocess/smart_ptr/shared_ptr.hpp>
//!\file
//!Describes an utility to form a shared pointer from this
namespace boost{
namespace interprocess{
//!This class is used as a base class that allows a shared_ptr to the current
//!object to be obtained from within a member function.
//!enable_shared_from_this defines two member functions called shared_from_this
//!that return a shared_ptr<T> and shared_ptr<T const>, depending on constness, to this.
template<class T, class A, class D>
class enable_shared_from_this
{
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
protected:
enable_shared_from_this()
{}
enable_shared_from_this(enable_shared_from_this const &)
{}
enable_shared_from_this & operator=(enable_shared_from_this const &)
{ return *this; }
~enable_shared_from_this()
{}
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
public:
shared_ptr<T, A, D> shared_from_this()
{
shared_ptr<T, A, D> p(_internal_weak_this);
BOOST_ASSERT(ipcdetail::to_raw_pointer(p.get()) == this);
return p;
}
shared_ptr<T const, A, D> shared_from_this() const
{
shared_ptr<T const, A, D> p(_internal_weak_this);
BOOST_ASSERT(ipcdetail::to_raw_pointer(p.get()) == this);
return p;
}
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
typedef T element_type;
mutable weak_ptr<element_type, A, D> _internal_weak_this;
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
};
} // namespace interprocess
} // namespace boost
#include <boost/interprocess/detail/config_end.hpp>
#endif // #ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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