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source: downloads/boost_1_34_1/boost/enable_shared_from_this.hpp @ 35

Last change on this file since 35 was 29, checked in by landauf, 16 years ago

updated boost from 1_33_1 to 1_34_1

File size: 1.6 KB
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1#ifndef BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
2#define BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
3
4//
5//  enable_shared_from_this.hpp
6//
7//  Copyright (c) 2002 Peter Dimov
8//
9// Distributed under the Boost Software License, Version 1.0. (See
10// accompanying file LICENSE_1_0.txt or copy at
11// http://www.boost.org/LICENSE_1_0.txt)
12//
13//  http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html
14//
15
16#include <boost/weak_ptr.hpp>
17#include <boost/shared_ptr.hpp>
18#include <boost/assert.hpp>
19#include <boost/config.hpp>
20
21namespace boost
22{
23
24template<class T> class enable_shared_from_this
25{
26protected:
27
28    enable_shared_from_this()
29    {
30    }
31
32    enable_shared_from_this(enable_shared_from_this const &)
33    {
34    }
35
36    enable_shared_from_this & operator=(enable_shared_from_this const &)
37    {
38        return *this;
39    }
40
41    ~enable_shared_from_this()
42    {
43    }
44
45public:
46
47    shared_ptr<T> shared_from_this()
48    {
49        shared_ptr<T> p(_internal_weak_this);
50        BOOST_ASSERT(p.get() == this);
51        return p;
52    }
53
54    shared_ptr<T const> shared_from_this() const
55    {
56        shared_ptr<T const> p(_internal_weak_this);
57        BOOST_ASSERT(p.get() == this);
58        return p;
59    }
60
61//  Note: No, you don't need to initialize _internal_weak_this
62//
63//  Please read the documentation, not the code
64//
65//  http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html
66
67    typedef T _internal_element_type; // for bcc 5.5.1
68    mutable weak_ptr<_internal_element_type> _internal_weak_this;
69};
70
71} // namespace boost
72
73#endif  // #ifndef BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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