1 //////////////////////////////////////////////////////////////////////////////
3 // This file is the adaptation for Interprocess of boost/enable_shared_from_this.hpp
5 // (C) Copyright Peter Dimov 2002
6 // (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
7 // Software License, Version 1.0. (See accompanying file
8 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
10 // See http://www.boost.org/libs/interprocess for documentation.
12 //////////////////////////////////////////////////////////////////////////////
14 #ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
15 #define BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
17 #ifndef BOOST_CONFIG_HPP
18 # include <boost/config.hpp>
21 #if defined(BOOST_HAS_PRAGMA_ONCE)
25 #include <boost/interprocess/detail/config_begin.hpp>
26 #include <boost/interprocess/detail/workaround.hpp>
28 #include <boost/assert.hpp>
29 #include <boost/interprocess/smart_ptr/weak_ptr.hpp>
30 #include <boost/interprocess/smart_ptr/shared_ptr.hpp>
33 //!Describes an utility to form a shared pointer from this
36 namespace interprocess{
38 //!This class is used as a base class that allows a shared_ptr to the current
39 //!object to be obtained from within a member function.
40 //!enable_shared_from_this defines two member functions called shared_from_this
41 //!that return a shared_ptr<T> and shared_ptr<T const>, depending on constness, to this.
42 template<class T, class A, class D>
43 class enable_shared_from_this
45 #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
47 enable_shared_from_this()
50 enable_shared_from_this(enable_shared_from_this const &)
53 enable_shared_from_this & operator=(enable_shared_from_this const &)
56 ~enable_shared_from_this()
58 #endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
61 shared_ptr<T, A, D> shared_from_this()
63 shared_ptr<T, A, D> p(_internal_weak_this);
64 BOOST_ASSERT(ipcdetail::to_raw_pointer(p.get()) == this);
68 shared_ptr<T const, A, D> shared_from_this() const
70 shared_ptr<T const, A, D> p(_internal_weak_this);
71 BOOST_ASSERT(ipcdetail::to_raw_pointer(p.get()) == this);
75 #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
76 typedef T element_type;
77 mutable weak_ptr<element_type, A, D> _internal_weak_this;
78 #endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
81 } // namespace interprocess
84 #include <boost/interprocess/detail/config_end.hpp>
86 #endif // #ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED