1 | #ifndef BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED |
3 | |
4 | // |
5 | // intrusive_ptr.hpp |
6 | // |
7 | // Copyright (c) 2001, 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 | // See http://www.boost.org/libs/smart_ptr/ for documentation. |
14 | // |
15 | |
16 | #include <boost/smart_ptr/detail/requires_cxx11.hpp> |
17 | |
18 | #include <boost/config.hpp> |
19 | |
20 | #include <boost/assert.hpp> |
21 | #include <boost/config/workaround.hpp> |
22 | #include <boost/smart_ptr/detail/sp_convertible.hpp> |
23 | #include <boost/smart_ptr/detail/sp_nullptr_t.hpp> |
24 | #include <boost/smart_ptr/detail/sp_noexcept.hpp> |
25 | |
26 | #include <boost/config/no_tr1/functional.hpp> // for std::less |
27 | |
28 | #if !defined(BOOST_NO_IOSTREAM) |
29 | #if !defined(BOOST_NO_IOSFWD) |
30 | #include <iosfwd> // for std::basic_ostream |
31 | #else |
32 | #include <ostream> |
33 | #endif |
34 | #endif |
35 | |
36 | |
37 | namespace boost |
38 | { |
39 | |
40 | // |
41 | // intrusive_ptr |
42 | // |
43 | // A smart pointer that uses intrusive reference counting. |
44 | // |
45 | // Relies on unqualified calls to |
46 | // |
47 | // void intrusive_ptr_add_ref(T * p); |
48 | // void intrusive_ptr_release(T * p); |
49 | // |
50 | // (p != 0) |
51 | // |
52 | // The object is responsible for destroying itself. |
53 | // |
54 | |
55 | template<class T> class intrusive_ptr |
56 | { |
57 | private: |
58 | |
59 | typedef intrusive_ptr this_type; |
60 | |
61 | public: |
62 | |
63 | typedef T element_type; |
64 | |
65 | BOOST_CONSTEXPR intrusive_ptr() BOOST_SP_NOEXCEPT : px( 0 ) |
66 | { |
67 | } |
68 | |
69 | intrusive_ptr( T * p, bool add_ref = true ): px( p ) |
70 | { |
71 | if( px != 0 && add_ref ) intrusive_ptr_add_ref( px ); |
72 | } |
73 | |
74 | #if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES) |
75 | |
76 | template<class U> |
77 | #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
78 | |
79 | intrusive_ptr( intrusive_ptr<U> const & rhs, typename boost::detail::sp_enable_if_convertible<U,T>::type = boost::detail::sp_empty() ) |
80 | |
81 | #else |
82 | |
83 | intrusive_ptr( intrusive_ptr<U> const & rhs ) |
84 | |
85 | #endif |
86 | : px( rhs.get() ) |
87 | { |
88 | if( px != 0 ) intrusive_ptr_add_ref( px ); |
89 | } |
90 | |
91 | #endif |
92 | |
93 | intrusive_ptr(intrusive_ptr const & rhs): px( rhs.px ) |
94 | { |
95 | if( px != 0 ) intrusive_ptr_add_ref( px ); |
96 | } |
97 | |
98 | ~intrusive_ptr() |
99 | { |
100 | if( px != 0 ) intrusive_ptr_release( px ); |
101 | } |
102 | |
103 | #if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES) |
104 | |
105 | template<class U> intrusive_ptr & operator=(intrusive_ptr<U> const & rhs) |
106 | { |
107 | this_type(rhs).swap(*this); |
108 | return *this; |
109 | } |
110 | |
111 | #endif |
112 | |
113 | // Move support |
114 | |
115 | #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
116 | |
117 | intrusive_ptr(intrusive_ptr && rhs) BOOST_SP_NOEXCEPT : px( rhs.px ) |
118 | { |
119 | rhs.px = 0; |
120 | } |
121 | |
122 | intrusive_ptr & operator=(intrusive_ptr && rhs) BOOST_SP_NOEXCEPT |
123 | { |
124 | this_type( static_cast< intrusive_ptr && >( rhs ) ).swap(*this); |
125 | return *this; |
126 | } |
127 | |
128 | template<class U> friend class intrusive_ptr; |
129 | |
130 | template<class U> |
131 | #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
132 | |
133 | intrusive_ptr(intrusive_ptr<U> && rhs, typename boost::detail::sp_enable_if_convertible<U,T>::type = boost::detail::sp_empty()) |
134 | |
135 | #else |
136 | |
137 | intrusive_ptr(intrusive_ptr<U> && rhs) |
138 | |
139 | #endif |
140 | : px( rhs.px ) |
141 | { |
142 | rhs.px = 0; |
143 | } |
144 | |
145 | template<class U> |
146 | intrusive_ptr & operator=(intrusive_ptr<U> && rhs) BOOST_SP_NOEXCEPT |
147 | { |
148 | this_type( static_cast< intrusive_ptr<U> && >( rhs ) ).swap(*this); |
149 | return *this; |
150 | } |
151 | |
152 | #endif |
153 | |
154 | intrusive_ptr & operator=(intrusive_ptr const & rhs) |
155 | { |
156 | this_type(rhs).swap(*this); |
157 | return *this; |
158 | } |
159 | |
160 | intrusive_ptr & operator=(T * rhs) |
161 | { |
162 | this_type(rhs).swap(*this); |
163 | return *this; |
164 | } |
165 | |
166 | void reset() |
167 | { |
168 | this_type().swap( *this ); |
169 | } |
170 | |
171 | void reset( T * rhs ) |
172 | { |
173 | this_type( rhs ).swap( *this ); |
174 | } |
175 | |
176 | void reset( T * rhs, bool add_ref ) |
177 | { |
178 | this_type( rhs, add_ref ).swap( *this ); |
179 | } |
180 | |
181 | T * get() const BOOST_SP_NOEXCEPT |
182 | { |
183 | return px; |
184 | } |
185 | |
186 | T * detach() BOOST_SP_NOEXCEPT |
187 | { |
188 | T * ret = px; |
189 | px = 0; |
190 | return ret; |
191 | } |
192 | |
193 | T & operator*() const BOOST_SP_NOEXCEPT_WITH_ASSERT |
194 | { |
195 | BOOST_ASSERT( px != 0 ); |
196 | return *px; |
197 | } |
198 | |
199 | T * operator->() const BOOST_SP_NOEXCEPT_WITH_ASSERT |
200 | { |
201 | BOOST_ASSERT( px != 0 ); |
202 | return px; |
203 | } |
204 | |
205 | // implicit conversion to "bool" |
206 | #include <boost/smart_ptr/detail/operator_bool.hpp> |
207 | |
208 | void swap(intrusive_ptr & rhs) BOOST_SP_NOEXCEPT |
209 | { |
210 | T * tmp = px; |
211 | px = rhs.px; |
212 | rhs.px = tmp; |
213 | } |
214 | |
215 | private: |
216 | |
217 | T * px; |
218 | }; |
219 | |
220 | template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) BOOST_SP_NOEXCEPT |
221 | { |
222 | return a.get() == b.get(); |
223 | } |
224 | |
225 | template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) BOOST_SP_NOEXCEPT |
226 | { |
227 | return a.get() != b.get(); |
228 | } |
229 | |
230 | template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, U * b) BOOST_SP_NOEXCEPT |
231 | { |
232 | return a.get() == b; |
233 | } |
234 | |
235 | template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, U * b) BOOST_SP_NOEXCEPT |
236 | { |
237 | return a.get() != b; |
238 | } |
239 | |
240 | template<class T, class U> inline bool operator==(T * a, intrusive_ptr<U> const & b) BOOST_SP_NOEXCEPT |
241 | { |
242 | return a == b.get(); |
243 | } |
244 | |
245 | template<class T, class U> inline bool operator!=(T * a, intrusive_ptr<U> const & b) BOOST_SP_NOEXCEPT |
246 | { |
247 | return a != b.get(); |
248 | } |
249 | |
250 | #if !defined( BOOST_NO_CXX11_NULLPTR ) |
251 | |
252 | template<class T> inline bool operator==( intrusive_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT |
253 | { |
254 | return p.get() == 0; |
255 | } |
256 | |
257 | template<class T> inline bool operator==( boost::detail::sp_nullptr_t, intrusive_ptr<T> const & p ) BOOST_SP_NOEXCEPT |
258 | { |
259 | return p.get() == 0; |
260 | } |
261 | |
262 | template<class T> inline bool operator!=( intrusive_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT |
263 | { |
264 | return p.get() != 0; |
265 | } |
266 | |
267 | template<class T> inline bool operator!=( boost::detail::sp_nullptr_t, intrusive_ptr<T> const & p ) BOOST_SP_NOEXCEPT |
268 | { |
269 | return p.get() != 0; |
270 | } |
271 | |
272 | #endif |
273 | |
274 | template<class T> inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b) BOOST_SP_NOEXCEPT |
275 | { |
276 | return std::less<T *>()(a.get(), b.get()); |
277 | } |
278 | |
279 | template<class T> void swap(intrusive_ptr<T> & lhs, intrusive_ptr<T> & rhs) BOOST_SP_NOEXCEPT |
280 | { |
281 | lhs.swap(rhs); |
282 | } |
283 | |
284 | // mem_fn support |
285 | |
286 | template<class T> T * get_pointer(intrusive_ptr<T> const & p) BOOST_SP_NOEXCEPT |
287 | { |
288 | return p.get(); |
289 | } |
290 | |
291 | // pointer casts |
292 | |
293 | template<class T, class U> intrusive_ptr<T> static_pointer_cast(intrusive_ptr<U> const & p) |
294 | { |
295 | return static_cast<T *>(p.get()); |
296 | } |
297 | |
298 | template<class T, class U> intrusive_ptr<T> const_pointer_cast(intrusive_ptr<U> const & p) |
299 | { |
300 | return const_cast<T *>(p.get()); |
301 | } |
302 | |
303 | template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U> const & p) |
304 | { |
305 | return dynamic_cast<T *>(p.get()); |
306 | } |
307 | |
308 | #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
309 | |
310 | template<class T, class U> intrusive_ptr<T> static_pointer_cast( intrusive_ptr<U> && p ) BOOST_SP_NOEXCEPT |
311 | { |
312 | return intrusive_ptr<T>( static_cast<T*>( p.detach() ), false ); |
313 | } |
314 | |
315 | template<class T, class U> intrusive_ptr<T> const_pointer_cast( intrusive_ptr<U> && p ) BOOST_SP_NOEXCEPT |
316 | { |
317 | return intrusive_ptr<T>( const_cast<T*>( p.detach() ), false ); |
318 | } |
319 | |
320 | template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast( intrusive_ptr<U> && p ) BOOST_SP_NOEXCEPT |
321 | { |
322 | T * p2 = dynamic_cast<T*>( p.get() ); |
323 | |
324 | intrusive_ptr<T> r( p2, false ); |
325 | |
326 | if( p2 ) p.detach(); |
327 | |
328 | return r; |
329 | } |
330 | |
331 | #endif // defined( BOOST_NO_CXX11_RVALUE_REFERENCES ) |
332 | |
333 | // operator<< |
334 | |
335 | #if !defined(BOOST_NO_IOSTREAM) |
336 | |
337 | #if defined(BOOST_NO_TEMPLATED_IOSTREAMS) || ( defined(__GNUC__) && (__GNUC__ < 3) ) |
338 | |
339 | template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p) |
340 | { |
341 | os << p.get(); |
342 | return os; |
343 | } |
344 | |
345 | #else |
346 | |
347 | // in STLport's no-iostreams mode no iostream symbols can be used |
348 | #ifndef _STLP_NO_IOSTREAMS |
349 | |
350 | # if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300 && __SGI_STL_PORT) |
351 | // MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL |
352 | using std::basic_ostream; |
353 | template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, intrusive_ptr<Y> const & p) |
354 | # else |
355 | template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p) |
356 | # endif |
357 | { |
358 | os << p.get(); |
359 | return os; |
360 | } |
361 | |
362 | #endif // _STLP_NO_IOSTREAMS |
363 | |
364 | #endif // __GNUC__ < 3 |
365 | |
366 | #endif // !defined(BOOST_NO_IOSTREAM) |
367 | |
368 | // hash_value |
369 | |
370 | template< class T > struct hash; |
371 | |
372 | template< class T > std::size_t hash_value( boost::intrusive_ptr<T> const & p ) BOOST_SP_NOEXCEPT |
373 | { |
374 | return boost::hash< T* >()( p.get() ); |
375 | } |
376 | |
377 | } // namespace boost |
378 | |
379 | // std::hash |
380 | |
381 | #if !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL) |
382 | |
383 | namespace std |
384 | { |
385 | |
386 | template<class T> struct hash< ::boost::intrusive_ptr<T> > |
387 | { |
388 | std::size_t operator()( ::boost::intrusive_ptr<T> const & p ) const BOOST_SP_NOEXCEPT |
389 | { |
390 | return std::hash< T* >()( p.get() ); |
391 | } |
392 | }; |
393 | |
394 | } // namespace std |
395 | |
396 | #endif // #if !defined(BOOST_NO_CXX11_HDR_FUNCTIONAL) |
397 | |
398 | #endif // #ifndef BOOST_SMART_PTR_INTRUSIVE_PTR_HPP_INCLUDED |
399 | |