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1 | #ifndef BOOST_DETAIL_SHARED_PTR_NMT_132_HPP_INCLUDED | |
2 | #define BOOST_DETAIL_SHARED_PTR_NMT_132_HPP_INCLUDED | |
3 | ||
4 | // | |
5 | // detail/shared_ptr_nmt.hpp - shared_ptr.hpp without member templates | |
6 | // | |
7 | // (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. | |
8 | // Copyright (c) 2001, 2002 Peter Dimov | |
9 | // | |
10 | // Distributed under the Boost Software License, Version 1.0. (See | |
11 | // accompanying file LICENSE_1_0.txt or copy at | |
12 | // http://www.boost.org/LICENSE_1_0.txt) | |
13 | // | |
14 | // See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation. | |
15 | // | |
16 | ||
17 | #include <boost/assert.hpp> | |
18 | #include <boost/checked_delete.hpp> | |
19 | #include <boost/serialization/throw_exception.hpp> | |
20 | #include <boost/detail/atomic_count.hpp> | |
21 | ||
22 | #ifndef BOOST_NO_AUTO_PTR | |
23 | # include <memory> // for std::auto_ptr | |
24 | #endif | |
25 | ||
26 | #include <algorithm> // for std::swap | |
27 | #include <functional> // for std::less | |
28 | #include <new> // for std::bad_alloc | |
29 | ||
30 | namespace boost | |
31 | { | |
32 | ||
33 | template<class T> class shared_ptr | |
34 | { | |
35 | private: | |
36 | ||
37 | typedef detail::atomic_count count_type; | |
38 | ||
39 | public: | |
40 | ||
41 | typedef T element_type; | |
42 | typedef T value_type; | |
43 | ||
44 | explicit shared_ptr(T * p = 0): px(p) | |
45 | { | |
46 | #ifndef BOOST_NO_EXCEPTIONS | |
47 | ||
48 | try // prevent leak if new throws | |
49 | { | |
50 | pn = new count_type(1); | |
51 | } | |
52 | catch(...) | |
53 | { | |
54 | boost::checked_delete(p); | |
55 | throw; | |
56 | } | |
57 | ||
58 | #else | |
59 | ||
60 | pn = new count_type(1); | |
61 | ||
62 | if(pn == 0) | |
63 | { | |
64 | boost::checked_delete(p); | |
65 | boost::serialization::throw_exception(std::bad_alloc()); | |
66 | } | |
67 | ||
68 | #endif | |
69 | } | |
70 | ||
71 | ~shared_ptr() | |
72 | { | |
73 | if(--*pn == 0) | |
74 | { | |
75 | boost::checked_delete(px); | |
76 | delete pn; | |
77 | } | |
78 | } | |
79 | ||
80 | shared_ptr(shared_ptr const & r): px(r.px) // never throws | |
81 | { | |
82 | pn = r.pn; | |
83 | ++*pn; | |
84 | } | |
85 | ||
86 | shared_ptr & operator=(shared_ptr const & r) | |
87 | { | |
88 | shared_ptr(r).swap(*this); | |
89 | return *this; | |
90 | } | |
91 | ||
92 | #ifndef BOOST_NO_AUTO_PTR | |
93 | ||
94 | explicit shared_ptr(std::auto_ptr< T > & r) | |
95 | { | |
96 | pn = new count_type(1); // may throw | |
97 | px = r.release(); // fix: moved here to stop leak if new throws | |
98 | } | |
99 | ||
100 | shared_ptr & operator=(std::auto_ptr< T > & r) | |
101 | { | |
102 | shared_ptr(r).swap(*this); | |
103 | return *this; | |
104 | } | |
105 | ||
106 | #endif | |
107 | ||
108 | void reset(T * p = 0) | |
109 | { | |
110 | BOOST_ASSERT(p == 0 || p != px); | |
111 | shared_ptr(p).swap(*this); | |
112 | } | |
113 | ||
114 | T & operator*() const // never throws | |
115 | { | |
116 | BOOST_ASSERT(px != 0); | |
117 | return *px; | |
118 | } | |
119 | ||
120 | T * operator->() const // never throws | |
121 | { | |
122 | BOOST_ASSERT(px != 0); | |
123 | return px; | |
124 | } | |
125 | ||
126 | T * get() const // never throws | |
127 | { | |
128 | return px; | |
129 | } | |
130 | ||
131 | long use_count() const // never throws | |
132 | { | |
133 | return *pn; | |
134 | } | |
135 | ||
136 | bool unique() const // never throws | |
137 | { | |
138 | return *pn == 1; | |
139 | } | |
140 | ||
141 | void swap(shared_ptr< T > & other) // never throws | |
142 | { | |
143 | std::swap(px, other.px); | |
144 | std::swap(pn, other.pn); | |
145 | } | |
146 | ||
147 | private: | |
148 | ||
149 | T * px; // contained pointer | |
150 | count_type * pn; // ptr to reference counter | |
151 | }; | |
152 | ||
153 | template<class T, class U> inline bool operator==(shared_ptr< T > const & a, shared_ptr<U> const & b) | |
154 | { | |
155 | return a.get() == b.get(); | |
156 | } | |
157 | ||
158 | template<class T, class U> inline bool operator!=(shared_ptr< T > const & a, shared_ptr<U> const & b) | |
159 | { | |
160 | return a.get() != b.get(); | |
161 | } | |
162 | ||
163 | template<class T> inline bool operator<(shared_ptr< T > const & a, shared_ptr< T > const & b) | |
164 | { | |
165 | return std::less<T*>()(a.get(), b.get()); | |
166 | } | |
167 | ||
168 | template<class T> void swap(shared_ptr< T > & a, shared_ptr< T > & b) | |
169 | { | |
170 | a.swap(b); | |
171 | } | |
172 | ||
173 | // get_pointer() enables boost::mem_fn to recognize shared_ptr | |
174 | ||
175 | template<class T> inline T * get_pointer(shared_ptr< T > const & p) | |
176 | { | |
177 | return p.get(); | |
178 | } | |
179 | ||
180 | } // namespace boost | |
181 | ||
182 | #endif // #ifndef BOOST_DETAIL_SHARED_PTR_NMT_132_HPP_INCLUDED |