88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// This file is the adaptation for Interprocess of boost/enable_shared_from_this.hpp
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//
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// (C) Copyright Peter Dimov 2002
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// (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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#define BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/assert.hpp>
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#include <boost/interprocess/smart_ptr/weak_ptr.hpp>
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#include <boost/interprocess/smart_ptr/shared_ptr.hpp>
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//!\file
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//!Describes an utility to form a shared pointer from this
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namespace boost{
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namespace interprocess{
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//!This class is used as a base class that allows a shared_ptr to the current
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//!object to be obtained from within a member function.
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//!enable_shared_from_this defines two member functions called shared_from_this
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//!that return a shared_ptr<T> and shared_ptr<T const>, depending on constness, to this.
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template<class T, class A, class D>
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class enable_shared_from_this
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{
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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protected:
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enable_shared_from_this()
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{}
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enable_shared_from_this(enable_shared_from_this const &)
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{}
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enable_shared_from_this & operator=(enable_shared_from_this const &)
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{ return *this; }
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~enable_shared_from_this()
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{}
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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public:
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shared_ptr<T, A, D> shared_from_this()
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{
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shared_ptr<T, A, D> p(_internal_weak_this);
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BOOST_ASSERT(ipcdetail::to_raw_pointer(p.get()) == this);
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return p;
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}
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shared_ptr<T const, A, D> shared_from_this() const
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{
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shared_ptr<T const, A, D> p(_internal_weak_this);
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BOOST_ASSERT(ipcdetail::to_raw_pointer(p.get()) == this);
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return p;
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}
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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typedef T element_type;
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mutable weak_ptr<element_type, A, D> _internal_weak_this;
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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};
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} // namespace interprocess
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} // namespace boost
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#include <boost/interprocess/detail/config_end.hpp>
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#endif // #ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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