]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED | |
3 | ||
4 | // MS compatible compilers support #pragma once | |
5 | ||
6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) | |
7 | # pragma once | |
8 | #endif | |
9 | ||
10 | // | |
11 | // detail/sp_counted_base_nt.hpp | |
12 | // | |
13 | // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. | |
14 | // Copyright 2004-2005 Peter Dimov | |
15 | // | |
16 | // Distributed under the Boost Software License, Version 1.0. (See | |
17 | // accompanying file LICENSE_1_0.txt or copy at | |
18 | // http://www.boost.org/LICENSE_1_0.txt) | |
19 | // | |
20 | ||
21 | #include <boost/detail/sp_typeinfo.hpp> | |
22 | ||
23 | namespace boost | |
24 | { | |
25 | ||
26 | namespace detail | |
27 | { | |
28 | ||
29 | class sp_counted_base | |
30 | { | |
31 | private: | |
32 | ||
33 | sp_counted_base( sp_counted_base const & ); | |
34 | sp_counted_base & operator= ( sp_counted_base const & ); | |
35 | ||
36 | long use_count_; // #shared | |
37 | long weak_count_; // #weak + (#shared != 0) | |
38 | ||
39 | public: | |
40 | ||
41 | sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) | |
42 | { | |
43 | } | |
44 | ||
45 | virtual ~sp_counted_base() // nothrow | |
46 | { | |
47 | } | |
48 | ||
49 | // dispose() is called when use_count_ drops to zero, to release | |
50 | // the resources managed by *this. | |
51 | ||
52 | virtual void dispose() = 0; // nothrow | |
53 | ||
54 | // destroy() is called when weak_count_ drops to zero. | |
55 | ||
56 | virtual void destroy() // nothrow | |
57 | { | |
58 | delete this; | |
59 | } | |
60 | ||
61 | virtual void * get_deleter( sp_typeinfo const & ti ) = 0; | |
62 | virtual void * get_untyped_deleter() = 0; | |
63 | ||
64 | void add_ref_copy() | |
65 | { | |
66 | ++use_count_; | |
67 | } | |
68 | ||
69 | bool add_ref_lock() // true on success | |
70 | { | |
71 | if( use_count_ == 0 ) return false; | |
72 | ++use_count_; | |
73 | return true; | |
74 | } | |
75 | ||
76 | void release() // nothrow | |
77 | { | |
78 | if( --use_count_ == 0 ) | |
79 | { | |
80 | dispose(); | |
81 | weak_release(); | |
82 | } | |
83 | } | |
84 | ||
85 | void weak_add_ref() // nothrow | |
86 | { | |
87 | ++weak_count_; | |
88 | } | |
89 | ||
90 | void weak_release() // nothrow | |
91 | { | |
92 | if( --weak_count_ == 0 ) | |
93 | { | |
94 | destroy(); | |
95 | } | |
96 | } | |
97 | ||
98 | long use_count() const // nothrow | |
99 | { | |
100 | return use_count_; | |
101 | } | |
102 | }; | |
103 | ||
104 | } // namespace detail | |
105 | ||
106 | } // namespace boost | |
107 | ||
108 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED |