projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | ////////////////////////////////////////////////////////////////////////////// |
| 2 | // | |
| 3 | // This file is the adaptation for Interprocess of boost/enable_shared_from_this.hpp | |
| 4 | // | |
| 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) | |
| 9 | // | |
| 10 | // See http://www.boost.org/libs/interprocess for documentation. | |
| 11 | // | |
| 12 | ////////////////////////////////////////////////////////////////////////////// | |
| 13 | ||
| 14 | #ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED | |
| 15 | #define BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED | |
| 16 | ||
| 17 | #ifndef BOOST_CONFIG_HPP | |
| 18 | # include <boost/config.hpp> | |
| 19 | #endif | |
| 20 | # | |
| 21 | #if defined(BOOST_HAS_PRAGMA_ONCE) | |
| 22 | # pragma once | |
| 23 | #endif | |
| 24 | ||
| 25 | #include <boost/interprocess/detail/config_begin.hpp> | |
| 26 | #include <boost/interprocess/detail/workaround.hpp> | |
| 27 | ||
| 28 | #include <boost/assert.hpp> | |
| 29 | #include <boost/interprocess/smart_ptr/weak_ptr.hpp> | |
| 30 | #include <boost/interprocess/smart_ptr/shared_ptr.hpp> | |
| 31 | ||
| 32 | //!\file | |
| 33 | //!Describes an utility to form a shared pointer from this | |
| 34 | ||
| 35 | namespace boost{ | |
| 36 | namespace interprocess{ | |
| 37 | ||
| 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 | |
| 44 | { | |
| 45 | #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED) | |
| 46 | protected: | |
| 47 | enable_shared_from_this() | |
| 48 | {} | |
| 49 | ||
| 50 | enable_shared_from_this(enable_shared_from_this const &) | |
| 51 | {} | |
| 52 | ||
| 53 | enable_shared_from_this & operator=(enable_shared_from_this const &) | |
| 54 | { return *this; } | |
| 55 | ||
| 56 | ~enable_shared_from_this() | |
| 57 | {} | |
| 58 | #endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED | |
| 59 | ||
| 60 | public: | |
| 61 | shared_ptr<T, A, D> shared_from_this() | |
| 62 | { | |
| 63 | shared_ptr<T, A, D> p(_internal_weak_this); | |
| 64 | BOOST_ASSERT(ipcdetail::to_raw_pointer(p.get()) == this); | |
| 65 | return p; | |
| 66 | } | |
| 67 | ||
| 68 | shared_ptr<T const, A, D> shared_from_this() const | |
| 69 | { | |
| 70 | shared_ptr<T const, A, D> p(_internal_weak_this); | |
| 71 | BOOST_ASSERT(ipcdetail::to_raw_pointer(p.get()) == this); | |
| 72 | return p; | |
| 73 | } | |
| 74 | ||
| 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 | |
| 79 | }; | |
| 80 | ||
| 81 | } // namespace interprocess | |
| 82 | } // namespace boost | |
| 83 | ||
| 84 | #include <boost/interprocess/detail/config_end.hpp> | |
| 85 | ||
| 86 | #endif // #ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED | |
| 87 |