1 | #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED |
2 | #define BOOST_SHARED_PTR_132_HPP_INCLUDED |
3 | |
4 | // |
5 | // shared_ptr.hpp |
6 | // |
7 | // (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. |
8 | // Copyright (c) 2001, 2002, 2003 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/config.hpp> // for broken compiler workarounds |
18 | |
19 | #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES) |
20 | #include <boost/serialization/detail/shared_ptr_nmt_132.hpp> |
21 | #else |
22 | |
23 | #include <boost/assert.hpp> |
24 | #include <boost/checked_delete.hpp> |
25 | #include <boost/serialization/throw_exception.hpp> |
26 | #include <boost/detail/workaround.hpp> |
27 | |
28 | #include <boost/serialization/access.hpp> |
29 | #include <boost/serialization/detail/shared_count_132.hpp> |
30 | |
31 | #include <memory> // for std::auto_ptr |
32 | #include <algorithm> // for std::swap |
33 | #include <functional> // for std::less |
34 | #include <typeinfo> // for std::bad_cast |
35 | #include <iosfwd> // for std::basic_ostream |
36 | |
37 | #ifdef BOOST_MSVC // moved here to work around VC++ compiler crash |
38 | # pragma warning(push) |
39 | # pragma warning(disable:4284) // odd return type for operator-> |
40 | #endif |
41 | |
42 | namespace boost_132 { |
43 | |
44 | template<class T> class weak_ptr; |
45 | template<class T> class enable_shared_from_this; |
46 | |
47 | namespace detail |
48 | { |
49 | |
50 | struct static_cast_tag {}; |
51 | struct const_cast_tag {}; |
52 | struct dynamic_cast_tag {}; |
53 | struct polymorphic_cast_tag {}; |
54 | |
55 | template<class T> struct shared_ptr_traits |
56 | { |
57 | typedef T & reference; |
58 | }; |
59 | |
60 | template<> struct shared_ptr_traits<void> |
61 | { |
62 | typedef void reference; |
63 | }; |
64 | |
65 | #if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS) |
66 | |
67 | template<> struct shared_ptr_traits<void const> |
68 | { |
69 | typedef void reference; |
70 | }; |
71 | |
72 | template<> struct shared_ptr_traits<void volatile> |
73 | { |
74 | typedef void reference; |
75 | }; |
76 | |
77 | template<> struct shared_ptr_traits<void const volatile> |
78 | { |
79 | typedef void reference; |
80 | }; |
81 | |
82 | #endif |
83 | |
84 | // enable_shared_from_this support |
85 | |
86 | template<class T, class Y> void sp_enable_shared_from_this( shared_count const & pn, enable_shared_from_this< T > const * pe, Y const * px ) |
87 | { |
88 | if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn); |
89 | } |
90 | |
91 | inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... ) |
92 | { |
93 | } |
94 | |
95 | } // namespace detail |
96 | |
97 | |
98 | // |
99 | // shared_ptr |
100 | // |
101 | // An enhanced relative of scoped_ptr with reference counted copy semantics. |
102 | // The object pointed to is deleted when the last shared_ptr pointing to it |
103 | // is destroyed or reset. |
104 | // |
105 | |
106 | template<class T> class shared_ptr |
107 | { |
108 | private: |
109 | // Borland 5.5.1 specific workaround |
110 | typedef shared_ptr< T > this_type; |
111 | |
112 | public: |
113 | |
114 | typedef T element_type; |
115 | typedef T value_type; |
116 | typedef T * pointer; |
117 | typedef typename detail::shared_ptr_traits< T >::reference reference; |
118 | |
119 | shared_ptr(): px(0), pn() // never throws in 1.30+ |
120 | { |
121 | } |
122 | |
123 | template<class Y> |
124 | explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete |
125 | { |
126 | detail::sp_enable_shared_from_this( pn, p, p ); |
127 | } |
128 | |
129 | // |
130 | // Requirements: D's copy constructor must not throw |
131 | // |
132 | // shared_ptr will release p by calling d(p) |
133 | // |
134 | |
135 | template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d) |
136 | { |
137 | detail::sp_enable_shared_from_this( pn, p, p ); |
138 | } |
139 | |
140 | // generated copy constructor, assignment, destructor are fine... |
141 | |
142 | // except that Borland C++ has a bug, and g++ with -Wsynth warns |
143 | #if defined(__GNUC__) |
144 | shared_ptr & operator=(shared_ptr const & r) // never throws |
145 | { |
146 | px = r.px; |
147 | pn = r.pn; // shared_count::op= doesn't throw |
148 | return *this; |
149 | } |
150 | #endif |
151 | |
152 | template<class Y> |
153 | explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw |
154 | { |
155 | // it is now safe to copy r.px, as pn(r.pn) did not throw |
156 | px = r.px; |
157 | } |
158 | |
159 | template<class Y> |
160 | shared_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws |
161 | { |
162 | } |
163 | |
164 | template<class Y> |
165 | shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn) |
166 | { |
167 | } |
168 | |
169 | template<class Y> |
170 | shared_ptr(shared_ptr<Y> const & r, detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn) |
171 | { |
172 | } |
173 | |
174 | template<class Y> |
175 | shared_ptr(shared_ptr<Y> const & r, detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn) |
176 | { |
177 | if(px == 0) // need to allocate new counter -- the cast failed |
178 | { |
179 | pn = detail::shared_count(); |
180 | } |
181 | } |
182 | |
183 | template<class Y> |
184 | shared_ptr(shared_ptr<Y> const & r, detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn) |
185 | { |
186 | if(px == 0) |
187 | { |
188 | boost::serialization::throw_exception(e: std::bad_cast()); |
189 | } |
190 | } |
191 | |
192 | #ifndef BOOST_NO_AUTO_PTR |
193 | |
194 | template<class Y> |
195 | explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn() |
196 | { |
197 | Y * tmp = r.get(); |
198 | pn = detail::shared_count(r); |
199 | detail::sp_enable_shared_from_this( pn, tmp, tmp ); |
200 | } |
201 | |
202 | #endif |
203 | |
204 | #if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200) |
205 | |
206 | template<class Y> |
207 | shared_ptr & operator=(shared_ptr<Y> const & r) // never throws |
208 | { |
209 | px = r.px; |
210 | pn = r.pn; // shared_count::op= doesn't throw |
211 | return *this; |
212 | } |
213 | |
214 | #endif |
215 | |
216 | #ifndef BOOST_NO_AUTO_PTR |
217 | |
218 | template<class Y> |
219 | shared_ptr & operator=(std::auto_ptr<Y> & r) |
220 | { |
221 | this_type(r).swap(*this); |
222 | return *this; |
223 | } |
224 | |
225 | #endif |
226 | |
227 | void reset() // never throws in 1.30+ |
228 | { |
229 | this_type().swap(*this); |
230 | } |
231 | |
232 | template<class Y> void reset(Y * p) // Y must be complete |
233 | { |
234 | BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors |
235 | this_type(p).swap(*this); |
236 | } |
237 | |
238 | template<class Y, class D> void reset(Y * p, D d) |
239 | { |
240 | this_type(p, d).swap(*this); |
241 | } |
242 | |
243 | reference operator* () const // never throws |
244 | { |
245 | BOOST_ASSERT(px != 0); |
246 | return *px; |
247 | } |
248 | |
249 | T * operator-> () const // never throws |
250 | { |
251 | BOOST_ASSERT(px != 0); |
252 | return px; |
253 | } |
254 | |
255 | T * get() const // never throws |
256 | { |
257 | return px; |
258 | } |
259 | |
260 | // implicit conversion to "bool" |
261 | |
262 | #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530) |
263 | |
264 | operator bool () const |
265 | { |
266 | return px != 0; |
267 | } |
268 | |
269 | #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) |
270 | typedef T * (this_type::*unspecified_bool_type)() const; |
271 | |
272 | operator unspecified_bool_type() const // never throws |
273 | { |
274 | return px == 0? 0: &this_type::get; |
275 | } |
276 | |
277 | #else |
278 | |
279 | typedef T * this_type::*unspecified_bool_type; |
280 | |
281 | operator unspecified_bool_type() const // never throws |
282 | { |
283 | return px == 0? 0: &this_type::px; |
284 | } |
285 | |
286 | #endif |
287 | |
288 | // operator! is redundant, but some compilers need it |
289 | |
290 | bool operator! () const // never throws |
291 | { |
292 | return px == 0; |
293 | } |
294 | |
295 | bool unique() const // never throws |
296 | { |
297 | return pn.unique(); |
298 | } |
299 | |
300 | long use_count() const // never throws |
301 | { |
302 | return pn.use_count(); |
303 | } |
304 | |
305 | void swap(shared_ptr< T > & other) // never throws |
306 | { |
307 | std::swap(px, other.px); |
308 | pn.swap(r&: other.pn); |
309 | } |
310 | |
311 | template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const |
312 | { |
313 | return pn < rhs.pn; |
314 | } |
315 | |
316 | void * _internal_get_deleter(std::type_info const & ti) const |
317 | { |
318 | return pn.get_deleter(ti); |
319 | } |
320 | |
321 | // Tasteless as this may seem, making all members public allows member templates |
322 | // to work in the absence of member template friends. (Matthew Langston) |
323 | |
324 | #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS |
325 | |
326 | private: |
327 | |
328 | template<class Y> friend class shared_ptr; |
329 | template<class Y> friend class weak_ptr; |
330 | |
331 | |
332 | #endif |
333 | public: // for serialization |
334 | T * px; // contained pointer |
335 | detail::shared_count pn; // reference counter |
336 | |
337 | }; // shared_ptr |
338 | |
339 | template<class T, class U> inline bool operator==(shared_ptr< T > const & a, shared_ptr<U> const & b) |
340 | { |
341 | return a.get() == b.get(); |
342 | } |
343 | |
344 | template<class T, class U> inline bool operator!=(shared_ptr< T > const & a, shared_ptr<U> const & b) |
345 | { |
346 | return a.get() != b.get(); |
347 | } |
348 | |
349 | template<class T, class U> inline bool operator<(shared_ptr< T > const & a, shared_ptr<U> const & b) |
350 | { |
351 | return a._internal_less(b); |
352 | } |
353 | |
354 | template<class T> inline void swap(shared_ptr< T > & a, shared_ptr< T > & b) |
355 | { |
356 | a.swap(b); |
357 | } |
358 | |
359 | template<class T, class U> shared_ptr< T > static_pointer_cast(shared_ptr<U> const & r) |
360 | { |
361 | return shared_ptr< T >(r, detail::static_cast_tag()); |
362 | } |
363 | |
364 | template<class T, class U> shared_ptr< T > const_pointer_cast(shared_ptr<U> const & r) |
365 | { |
366 | return shared_ptr< T >(r, detail::const_cast_tag()); |
367 | } |
368 | |
369 | template<class T, class U> shared_ptr< T > dynamic_pointer_cast(shared_ptr<U> const & r) |
370 | { |
371 | return shared_ptr< T >(r, detail::dynamic_cast_tag()); |
372 | } |
373 | |
374 | // shared_*_cast names are deprecated. Use *_pointer_cast instead. |
375 | |
376 | template<class T, class U> shared_ptr< T > shared_static_cast(shared_ptr<U> const & r) |
377 | { |
378 | return shared_ptr< T >(r, detail::static_cast_tag()); |
379 | } |
380 | |
381 | template<class T, class U> shared_ptr< T > shared_dynamic_cast(shared_ptr<U> const & r) |
382 | { |
383 | return shared_ptr< T >(r, detail::dynamic_cast_tag()); |
384 | } |
385 | |
386 | template<class T, class U> shared_ptr< T > shared_polymorphic_cast(shared_ptr<U> const & r) |
387 | { |
388 | return shared_ptr< T >(r, detail::polymorphic_cast_tag()); |
389 | } |
390 | |
391 | template<class T, class U> shared_ptr< T > shared_polymorphic_downcast(shared_ptr<U> const & r) |
392 | { |
393 | BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get()); |
394 | return shared_static_cast< T >(r); |
395 | } |
396 | |
397 | // get_pointer() enables boost::mem_fn to recognize shared_ptr |
398 | |
399 | template<class T> inline T * get_pointer(shared_ptr< T > const & p) |
400 | { |
401 | return p.get(); |
402 | } |
403 | |
404 | // operator<< |
405 | |
406 | |
407 | template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p) |
408 | { |
409 | os << p.get(); |
410 | return os; |
411 | } |
412 | |
413 | // get_deleter (experimental) |
414 | |
415 | #if defined(__EDG_VERSION__) && (__EDG_VERSION__ <= 238) |
416 | |
417 | // g++ 2.9x doesn't allow static_cast<X const *>(void *) |
418 | // apparently EDG 2.38 also doesn't accept it |
419 | |
420 | template<class D, class T> D * get_deleter(shared_ptr< T > const & p) |
421 | { |
422 | void const * q = p._internal_get_deleter(typeid(D)); |
423 | return const_cast<D *>(static_cast<D const *>(q)); |
424 | } |
425 | |
426 | #else |
427 | |
428 | template<class D, class T> D * get_deleter(shared_ptr< T > const & p) |
429 | { |
430 | return static_cast<D *>(p._internal_get_deleter(typeid(D))); |
431 | } |
432 | |
433 | #endif |
434 | |
435 | } // namespace boost |
436 | |
437 | #ifdef BOOST_MSVC |
438 | # pragma warning(pop) |
439 | #endif |
440 | |
441 | #endif // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES) |
442 | |
443 | #endif // #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED |
444 | |