| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // This file is the adaptation for Interprocess of boost/enable_shared_from_this.hpp |
| // |
| // (C) Copyright Peter Dimov 2002 |
| // (C) Copyright Ion Gaztanaga 2006. 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 |
| |
| #include <boost/interprocess/detail/workaround.hpp> |
| #include <boost/interprocess/detail/config_begin.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 |
| { |
| /// @cond |
| 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() |
| {} |
| /// @endcond |
| |
| public: |
| shared_ptr<T, A, D> shared_from_this() |
| { |
| shared_ptr<T, A, D> p(_internal_weak_this); |
| BOOST_ASSERT(detail::get_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(detail::get_pointer(p.get()) == this); |
| return p; |
| } |
| |
| /// @cond |
| typedef T element_type; |
| mutable weak_ptr<element_type, A, D> _internal_weak_this; |
| /// @endcond |
| }; |
| |
| } // namespace interprocess |
| } // namespace boost |
| |
| #include <boost/interprocess/detail/config_end.hpp> |
| |
| #endif // #ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED |
| |