1#ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
2#define BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
3
4//
5// shared_ptr.hpp
6//
7// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
8// Copyright (c) 2001-2008 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/ for documentation.
15//
16
17#include <boost/config.hpp> // for broken compiler workarounds
18
19// In order to avoid circular dependencies with Boost.TR1
20// we make sure that our include of <memory> doesn't try to
21// pull in the TR1 headers: that's why we use this header
22// rather than including <memory> directly:
23#include <boost/config/no_tr1/memory.hpp> // std::auto_ptr
24
25#include <boost/assert.hpp>
26#include <boost/checked_delete.hpp>
27#include <boost/throw_exception.hpp>
28#include <boost/smart_ptr/detail/shared_count.hpp>
29#include <boost/detail/workaround.hpp>
30#include <boost/smart_ptr/detail/sp_convertible.hpp>
31#include <boost/smart_ptr/detail/sp_nullptr_t.hpp>
32#include <boost/smart_ptr/detail/sp_disable_deprecated.hpp>
33#include <boost/smart_ptr/detail/sp_noexcept.hpp>
34
35#if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
36#include <boost/smart_ptr/detail/spinlock_pool.hpp>
37#endif
38
39#include <algorithm> // for std::swap
40#include <functional> // for std::less
41#include <typeinfo> // for std::bad_cast
42#include <cstddef> // for std::size_t
43
44#if !defined(BOOST_NO_IOSTREAM)
45#if !defined(BOOST_NO_IOSFWD)
46#include <iosfwd> // for std::basic_ostream
47#else
48#include <ostream>
49#endif
50#endif
51
52#if defined( BOOST_SP_DISABLE_DEPRECATED )
53#pragma GCC diagnostic push
54#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
55#endif
56
57namespace boost
58{
59
60template<class T> class shared_ptr;
61template<class T> class weak_ptr;
62template<class T> class enable_shared_from_this;
63class enable_shared_from_raw;
64
65namespace movelib
66{
67
68 template< class T, class D > class unique_ptr;
69
70} // namespace movelib
71
72namespace detail
73{
74
75// sp_element, element_type
76
77template< class T > struct sp_element
78{
79 typedef T type;
80};
81
82#if !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
83
84template< class T > struct sp_element< T[] >
85{
86 typedef T type;
87};
88
89#if !defined( __BORLANDC__ ) || !BOOST_WORKAROUND( __BORLANDC__, < 0x600 )
90
91template< class T, std::size_t N > struct sp_element< T[N] >
92{
93 typedef T type;
94};
95
96#endif
97
98#endif // !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
99
100// sp_dereference, return type of operator*
101
102template< class T > struct sp_dereference
103{
104 typedef T & type;
105};
106
107template<> struct sp_dereference< void >
108{
109 typedef void type;
110};
111
112#if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)
113
114template<> struct sp_dereference< void const >
115{
116 typedef void type;
117};
118
119template<> struct sp_dereference< void volatile >
120{
121 typedef void type;
122};
123
124template<> struct sp_dereference< void const volatile >
125{
126 typedef void type;
127};
128
129#endif // !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)
130
131#if !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
132
133template< class T > struct sp_dereference< T[] >
134{
135 typedef void type;
136};
137
138#if !defined( __BORLANDC__ ) || !BOOST_WORKAROUND( __BORLANDC__, < 0x600 )
139
140template< class T, std::size_t N > struct sp_dereference< T[N] >
141{
142 typedef void type;
143};
144
145#endif
146
147#endif // !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
148
149// sp_member_access, return type of operator->
150
151template< class T > struct sp_member_access
152{
153 typedef T * type;
154};
155
156#if !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
157
158template< class T > struct sp_member_access< T[] >
159{
160 typedef void type;
161};
162
163#if !defined( __BORLANDC__ ) || !BOOST_WORKAROUND( __BORLANDC__, < 0x600 )
164
165template< class T, std::size_t N > struct sp_member_access< T[N] >
166{
167 typedef void type;
168};
169
170#endif
171
172#endif // !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
173
174// sp_array_access, return type of operator[]
175
176template< class T > struct sp_array_access
177{
178 typedef void type;
179};
180
181#if !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
182
183template< class T > struct sp_array_access< T[] >
184{
185 typedef T & type;
186};
187
188#if !defined( __BORLANDC__ ) || !BOOST_WORKAROUND( __BORLANDC__, < 0x600 )
189
190template< class T, std::size_t N > struct sp_array_access< T[N] >
191{
192 typedef T & type;
193};
194
195#endif
196
197#endif // !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
198
199// sp_extent, for operator[] index check
200
201template< class T > struct sp_extent
202{
203 enum _vt { value = 0 };
204};
205
206#if !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
207
208template< class T, std::size_t N > struct sp_extent< T[N] >
209{
210 enum _vt { value = N };
211};
212
213#endif // !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
214
215// enable_shared_from_this support
216
217template< class X, class Y, class T > inline void sp_enable_shared_from_this( boost::shared_ptr<X> const * ppx, Y const * py, boost::enable_shared_from_this< T > const * pe )
218{
219 if( pe != 0 )
220 {
221 pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
222 }
223}
224
225template< class X, class Y > inline void sp_enable_shared_from_this( boost::shared_ptr<X> * ppx, Y const * py, boost::enable_shared_from_raw const * pe );
226
227#ifdef _MANAGED
228
229// Avoid C4793, ... causes native code generation
230
231struct sp_any_pointer
232{
233 template<class T> sp_any_pointer( T* ) {}
234};
235
236inline void sp_enable_shared_from_this( sp_any_pointer, sp_any_pointer, sp_any_pointer )
237{
238}
239
240#else // _MANAGED
241
242inline void sp_enable_shared_from_this( ... )
243{
244}
245
246#endif // _MANAGED
247
248#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined( BOOST_NO_AUTO_PTR )
249
250// rvalue auto_ptr support based on a technique by Dave Abrahams
251
252template< class T, class R > struct sp_enable_if_auto_ptr
253{
254};
255
256template< class T, class R > struct sp_enable_if_auto_ptr< std::auto_ptr< T >, R >
257{
258 typedef R type;
259};
260
261#endif
262
263// sp_assert_convertible
264
265template< class Y, class T > inline void sp_assert_convertible() BOOST_SP_NOEXCEPT
266{
267#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
268
269 // static_assert( sp_convertible< Y, T >::value );
270 typedef char tmp[ sp_convertible< Y, T >::value? 1: -1 ];
271 (void)sizeof( tmp );
272
273#else
274
275 T* p = static_cast< Y* >( 0 );
276 (void)p;
277
278#endif
279}
280
281// pointer constructor helper
282
283template< class T, class Y > inline void sp_pointer_construct( boost::shared_ptr< T > * ppx, Y * p, boost::detail::shared_count & pn )
284{
285 boost::detail::shared_count( p ).swap( pn );
286 boost::detail::sp_enable_shared_from_this( ppx, p, p );
287}
288
289#if !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
290
291template< class T, class Y > inline void sp_pointer_construct( boost::shared_ptr< T[] > * /*ppx*/, Y * p, boost::detail::shared_count & pn )
292{
293 sp_assert_convertible< Y[], T[] >();
294 boost::detail::shared_count( p, boost::checked_array_deleter< T >() ).swap( pn );
295}
296
297template< class T, std::size_t N, class Y > inline void sp_pointer_construct( boost::shared_ptr< T[N] > * /*ppx*/, Y * p, boost::detail::shared_count & pn )
298{
299 sp_assert_convertible< Y[N], T[N] >();
300 boost::detail::shared_count( p, boost::checked_array_deleter< T >() ).swap( pn );
301}
302
303#endif // !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
304
305// deleter constructor helper
306
307template< class T, class Y > inline void sp_deleter_construct( boost::shared_ptr< T > * ppx, Y * p )
308{
309 boost::detail::sp_enable_shared_from_this( ppx, p, p );
310}
311
312#if !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
313
314template< class T, class Y > inline void sp_deleter_construct( boost::shared_ptr< T[] > * /*ppx*/, Y * /*p*/ )
315{
316 sp_assert_convertible< Y[], T[] >();
317}
318
319template< class T, std::size_t N, class Y > inline void sp_deleter_construct( boost::shared_ptr< T[N] > * /*ppx*/, Y * /*p*/ )
320{
321 sp_assert_convertible< Y[N], T[N] >();
322}
323
324#endif // !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
325
326struct sp_internal_constructor_tag
327{
328};
329
330} // namespace detail
331
332
333//
334// shared_ptr
335//
336// An enhanced relative of scoped_ptr with reference counted copy semantics.
337// The object pointed to is deleted when the last shared_ptr pointing to it
338// is destroyed or reset.
339//
340
341template<class T> class shared_ptr
342{
343private:
344
345 // Borland 5.5.1 specific workaround
346 typedef shared_ptr<T> this_type;
347
348public:
349
350 typedef typename boost::detail::sp_element< T >::type element_type;
351
352 BOOST_CONSTEXPR shared_ptr() BOOST_SP_NOEXCEPT : px( 0 ), pn()
353 {
354 }
355
356#if !defined( BOOST_NO_CXX11_NULLPTR )
357
358 BOOST_CONSTEXPR shared_ptr( boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT : px( 0 ), pn()
359 {
360 }
361
362#endif
363
364 BOOST_CONSTEXPR shared_ptr( boost::detail::sp_internal_constructor_tag, element_type * px_, boost::detail::shared_count const & pn_ ) BOOST_SP_NOEXCEPT : px( px_ ), pn( pn_ )
365 {
366 }
367
368#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
369
370 BOOST_CONSTEXPR shared_ptr( boost::detail::sp_internal_constructor_tag, element_type * px_, boost::detail::shared_count && pn_ ) BOOST_SP_NOEXCEPT : px( px_ ), pn( std::move( pn_ ) )
371 {
372 }
373
374#endif
375
376 template<class Y>
377 explicit shared_ptr( Y * p ): px( p ), pn() // Y must be complete
378 {
379 boost::detail::sp_pointer_construct( this, p, pn );
380 }
381
382 //
383 // Requirements: D's copy constructor must not throw
384 //
385 // shared_ptr will release p by calling d(p)
386 //
387
388 template<class Y, class D> shared_ptr( Y * p, D d ): px( p ), pn( p, d )
389 {
390 boost::detail::sp_deleter_construct( this, p );
391 }
392
393#if !defined( BOOST_NO_CXX11_NULLPTR )
394
395 template<class D> shared_ptr( boost::detail::sp_nullptr_t p, D d ): px( p ), pn( p, d )
396 {
397 }
398
399#endif
400
401 // As above, but with allocator. A's copy constructor shall not throw.
402
403 template<class Y, class D, class A> shared_ptr( Y * p, D d, A a ): px( p ), pn( p, d, a )
404 {
405 boost::detail::sp_deleter_construct( this, p );
406 }
407
408#if !defined( BOOST_NO_CXX11_NULLPTR )
409
410 template<class D, class A> shared_ptr( boost::detail::sp_nullptr_t p, D d, A a ): px( p ), pn( p, d, a )
411 {
412 }
413
414#endif
415
416// generated copy constructor, destructor are fine...
417
418#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
419
420// ... except in C++0x, move disables the implicit copy
421
422 shared_ptr( shared_ptr const & r ) BOOST_SP_NOEXCEPT : px( r.px ), pn( r.pn )
423 {
424 }
425
426#endif
427
428 template<class Y>
429 explicit shared_ptr( weak_ptr<Y> const & r ): pn( r.pn ) // may throw
430 {
431 boost::detail::sp_assert_convertible< Y, T >();
432
433 // it is now safe to copy r.px, as pn(r.pn) did not throw
434 px = r.px;
435 }
436
437 template<class Y>
438 shared_ptr( weak_ptr<Y> const & r, boost::detail::sp_nothrow_tag )
439 BOOST_SP_NOEXCEPT : px( 0 ), pn( r.pn, boost::detail::sp_nothrow_tag() )
440 {
441 if( !pn.empty() )
442 {
443 px = r.px;
444 }
445 }
446
447 template<class Y>
448#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
449
450 shared_ptr( shared_ptr<Y> const & r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )
451
452#else
453
454 shared_ptr( shared_ptr<Y> const & r )
455
456#endif
457 BOOST_SP_NOEXCEPT : px( r.px ), pn( r.pn )
458 {
459 boost::detail::sp_assert_convertible< Y, T >();
460 }
461
462 // aliasing
463 template< class Y >
464 shared_ptr( shared_ptr<Y> const & r, element_type * p ) BOOST_SP_NOEXCEPT : px( p ), pn( r.pn )
465 {
466 }
467
468#ifndef BOOST_NO_AUTO_PTR
469
470 template<class Y>
471 explicit shared_ptr( std::auto_ptr<Y> & r ): px(r.get()), pn()
472 {
473 boost::detail::sp_assert_convertible< Y, T >();
474
475 Y * tmp = r.get();
476 pn = boost::detail::shared_count( r );
477
478 boost::detail::sp_deleter_construct( this, tmp );
479 }
480
481#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
482
483 template<class Y>
484 shared_ptr( std::auto_ptr<Y> && r ): px(r.get()), pn()
485 {
486 boost::detail::sp_assert_convertible< Y, T >();
487
488 Y * tmp = r.get();
489 pn = boost::detail::shared_count( r );
490
491 boost::detail::sp_deleter_construct( this, tmp );
492 }
493
494#elif !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
495
496 template<class Ap>
497 explicit shared_ptr( Ap r, typename boost::detail::sp_enable_if_auto_ptr<Ap, int>::type = 0 ): px( r.get() ), pn()
498 {
499 typedef typename Ap::element_type Y;
500
501 boost::detail::sp_assert_convertible< Y, T >();
502
503 Y * tmp = r.get();
504 pn = boost::detail::shared_count( r );
505
506 boost::detail::sp_deleter_construct( this, tmp );
507 }
508
509#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
510
511#endif // BOOST_NO_AUTO_PTR
512
513#if !defined( BOOST_NO_CXX11_SMART_PTR ) && !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
514
515 template< class Y, class D >
516 shared_ptr( std::unique_ptr< Y, D > && r ): px( r.get() ), pn()
517 {
518 boost::detail::sp_assert_convertible< Y, T >();
519
520 typename std::unique_ptr< Y, D >::pointer tmp = r.get();
521
522 if( tmp != 0 )
523 {
524 pn = boost::detail::shared_count( r );
525 boost::detail::sp_deleter_construct( this, tmp );
526 }
527 }
528
529#endif
530
531 template< class Y, class D >
532 shared_ptr( boost::movelib::unique_ptr< Y, D > r ): px( r.get() ), pn()
533 {
534 boost::detail::sp_assert_convertible< Y, T >();
535
536 typename boost::movelib::unique_ptr< Y, D >::pointer tmp = r.get();
537
538 if( tmp != 0 )
539 {
540 pn = boost::detail::shared_count( r );
541 boost::detail::sp_deleter_construct( this, tmp );
542 }
543 }
544
545 // assignment
546
547 shared_ptr & operator=( shared_ptr const & r ) BOOST_SP_NOEXCEPT
548 {
549 this_type(r).swap(*this);
550 return *this;
551 }
552
553#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1400)
554
555 template<class Y>
556 shared_ptr & operator=(shared_ptr<Y> const & r) BOOST_SP_NOEXCEPT
557 {
558 this_type(r).swap(*this);
559 return *this;
560 }
561
562#endif
563
564#ifndef BOOST_NO_AUTO_PTR
565
566 template<class Y>
567 shared_ptr & operator=( std::auto_ptr<Y> & r )
568 {
569 this_type( r ).swap( *this );
570 return *this;
571 }
572
573#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
574
575 template<class Y>
576 shared_ptr & operator=( std::auto_ptr<Y> && r )
577 {
578 this_type( static_cast< std::auto_ptr<Y> && >( r ) ).swap( *this );
579 return *this;
580 }
581
582#elif !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )
583
584 template<class Ap>
585 typename boost::detail::sp_enable_if_auto_ptr< Ap, shared_ptr & >::type operator=( Ap r )
586 {
587 this_type( r ).swap( *this );
588 return *this;
589 }
590
591#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
592
593#endif // BOOST_NO_AUTO_PTR
594
595#if !defined( BOOST_NO_CXX11_SMART_PTR ) && !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
596
597 template<class Y, class D>
598 shared_ptr & operator=( std::unique_ptr<Y, D> && r )
599 {
600 this_type( static_cast< std::unique_ptr<Y, D> && >( r ) ).swap(*this);
601 return *this;
602 }
603
604#endif
605
606 template<class Y, class D>
607 shared_ptr & operator=( boost::movelib::unique_ptr<Y, D> r )
608 {
609 // this_type( static_cast< unique_ptr<Y, D> && >( r ) ).swap( *this );
610
611 boost::detail::sp_assert_convertible< Y, T >();
612
613 typename boost::movelib::unique_ptr< Y, D >::pointer p = r.get();
614
615 shared_ptr tmp;
616
617 if( p != 0 )
618 {
619 tmp.px = p;
620 tmp.pn = boost::detail::shared_count( r );
621
622 boost::detail::sp_deleter_construct( &tmp, p );
623 }
624
625 tmp.swap( *this );
626
627 return *this;
628 }
629
630// Move support
631
632#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
633
634 shared_ptr( shared_ptr && r ) BOOST_SP_NOEXCEPT : px( r.px ), pn()
635 {
636 pn.swap( r.pn );
637 r.px = 0;
638 }
639
640 template<class Y>
641#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
642
643 shared_ptr( shared_ptr<Y> && r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )
644
645#else
646
647 shared_ptr( shared_ptr<Y> && r )
648
649#endif
650 BOOST_SP_NOEXCEPT : px( r.px ), pn()
651 {
652 boost::detail::sp_assert_convertible< Y, T >();
653
654 pn.swap( r.pn );
655 r.px = 0;
656 }
657
658 shared_ptr & operator=( shared_ptr && r ) BOOST_SP_NOEXCEPT
659 {
660 this_type( static_cast< shared_ptr && >( r ) ).swap( *this );
661 return *this;
662 }
663
664 template<class Y>
665 shared_ptr & operator=( shared_ptr<Y> && r ) BOOST_SP_NOEXCEPT
666 {
667 this_type( static_cast< shared_ptr<Y> && >( r ) ).swap( *this );
668 return *this;
669 }
670
671 // aliasing move
672 template<class Y>
673 shared_ptr( shared_ptr<Y> && r, element_type * p ) BOOST_SP_NOEXCEPT : px( p ), pn()
674 {
675 pn.swap( r.pn );
676 r.px = 0;
677 }
678
679#endif
680
681#if !defined( BOOST_NO_CXX11_NULLPTR )
682
683 shared_ptr & operator=( boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT
684 {
685 this_type().swap(*this);
686 return *this;
687 }
688
689#endif
690
691 void reset() BOOST_SP_NOEXCEPT
692 {
693 this_type().swap(*this);
694 }
695
696 template<class Y> void reset( Y * p ) // Y must be complete
697 {
698 BOOST_ASSERT( p == 0 || p != px ); // catch self-reset errors
699 this_type( p ).swap( *this );
700 }
701
702 template<class Y, class D> void reset( Y * p, D d )
703 {
704 this_type( p, d ).swap( *this );
705 }
706
707 template<class Y, class D, class A> void reset( Y * p, D d, A a )
708 {
709 this_type( p, d, a ).swap( *this );
710 }
711
712 template<class Y> void reset( shared_ptr<Y> const & r, element_type * p ) BOOST_SP_NOEXCEPT
713 {
714 this_type( r, p ).swap( *this );
715 }
716
717#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
718
719 template<class Y> void reset( shared_ptr<Y> && r, element_type * p ) BOOST_SP_NOEXCEPT
720 {
721 this_type( static_cast< shared_ptr<Y> && >( r ), p ).swap( *this );
722 }
723
724#endif
725
726 typename boost::detail::sp_dereference< T >::type operator* () const BOOST_SP_NOEXCEPT_WITH_ASSERT
727 {
728 BOOST_ASSERT( px != 0 );
729 return *px;
730 }
731
732 typename boost::detail::sp_member_access< T >::type operator-> () const BOOST_SP_NOEXCEPT_WITH_ASSERT
733 {
734 BOOST_ASSERT( px != 0 );
735 return px;
736 }
737
738 typename boost::detail::sp_array_access< T >::type operator[] ( std::ptrdiff_t i ) const BOOST_SP_NOEXCEPT_WITH_ASSERT
739 {
740 BOOST_ASSERT( px != 0 );
741 BOOST_ASSERT( i >= 0 && ( i < boost::detail::sp_extent< T >::value || boost::detail::sp_extent< T >::value == 0 ) );
742
743 return static_cast< typename boost::detail::sp_array_access< T >::type >( px[ i ] );
744 }
745
746 element_type * get() const BOOST_SP_NOEXCEPT
747 {
748 return px;
749 }
750
751// implicit conversion to "bool"
752#include <boost/smart_ptr/detail/operator_bool.hpp>
753
754 bool unique() const BOOST_SP_NOEXCEPT
755 {
756 return pn.unique();
757 }
758
759 long use_count() const BOOST_SP_NOEXCEPT
760 {
761 return pn.use_count();
762 }
763
764 void swap( shared_ptr & other ) BOOST_SP_NOEXCEPT
765 {
766 std::swap(px, other.px);
767 pn.swap(other.pn);
768 }
769
770 template<class Y> bool owner_before( shared_ptr<Y> const & rhs ) const BOOST_SP_NOEXCEPT
771 {
772 return pn < rhs.pn;
773 }
774
775 template<class Y> bool owner_before( weak_ptr<Y> const & rhs ) const BOOST_SP_NOEXCEPT
776 {
777 return pn < rhs.pn;
778 }
779
780 void * _internal_get_deleter( boost::detail::sp_typeinfo const & ti ) const BOOST_SP_NOEXCEPT
781 {
782 return pn.get_deleter( ti );
783 }
784
785 void * _internal_get_local_deleter( boost::detail::sp_typeinfo const & ti ) const BOOST_SP_NOEXCEPT
786 {
787 return pn.get_local_deleter( ti );
788 }
789
790 void * _internal_get_untyped_deleter() const BOOST_SP_NOEXCEPT
791 {
792 return pn.get_untyped_deleter();
793 }
794
795 bool _internal_equiv( shared_ptr const & r ) const BOOST_SP_NOEXCEPT
796 {
797 return px == r.px && pn == r.pn;
798 }
799
800 boost::detail::shared_count _internal_count() const BOOST_NOEXCEPT
801 {
802 return pn;
803 }
804
805// Tasteless as this may seem, making all members public allows member templates
806// to work in the absence of member template friends. (Matthew Langston)
807
808#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
809
810private:
811
812 template<class Y> friend class shared_ptr;
813 template<class Y> friend class weak_ptr;
814
815
816#endif
817
818 element_type * px; // contained pointer
819 boost::detail::shared_count pn; // reference counter
820
821}; // shared_ptr
822
823template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b) BOOST_SP_NOEXCEPT
824{
825 return a.get() == b.get();
826}
827
828template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b) BOOST_SP_NOEXCEPT
829{
830 return a.get() != b.get();
831}
832
833#if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
834
835// Resolve the ambiguity between our op!= and the one in rel_ops
836
837template<class T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T> const & b) BOOST_SP_NOEXCEPT
838{
839 return a.get() != b.get();
840}
841
842#endif
843
844#if !defined( BOOST_NO_CXX11_NULLPTR )
845
846template<class T> inline bool operator==( shared_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT
847{
848 return p.get() == 0;
849}
850
851template<class T> inline bool operator==( boost::detail::sp_nullptr_t, shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
852{
853 return p.get() == 0;
854}
855
856template<class T> inline bool operator!=( shared_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_SP_NOEXCEPT
857{
858 return p.get() != 0;
859}
860
861template<class T> inline bool operator!=( boost::detail::sp_nullptr_t, shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
862{
863 return p.get() != 0;
864}
865
866#endif
867
868template<class T, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b) BOOST_SP_NOEXCEPT
869{
870 return a.owner_before( b );
871}
872
873template<class T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b) BOOST_SP_NOEXCEPT
874{
875 a.swap(b);
876}
877
878template<class T, class U> shared_ptr<T> static_pointer_cast( shared_ptr<U> const & r ) BOOST_SP_NOEXCEPT
879{
880 (void) static_cast< T* >( static_cast< U* >( 0 ) );
881
882 typedef typename shared_ptr<T>::element_type E;
883
884 E * p = static_cast< E* >( r.get() );
885 return shared_ptr<T>( r, p );
886}
887
888template<class T, class U> shared_ptr<T> const_pointer_cast( shared_ptr<U> const & r ) BOOST_SP_NOEXCEPT
889{
890 (void) const_cast< T* >( static_cast< U* >( 0 ) );
891
892 typedef typename shared_ptr<T>::element_type E;
893
894 E * p = const_cast< E* >( r.get() );
895 return shared_ptr<T>( r, p );
896}
897
898template<class T, class U> shared_ptr<T> dynamic_pointer_cast( shared_ptr<U> const & r ) BOOST_SP_NOEXCEPT
899{
900 (void) dynamic_cast< T* >( static_cast< U* >( 0 ) );
901
902 typedef typename shared_ptr<T>::element_type E;
903
904 E * p = dynamic_cast< E* >( r.get() );
905 return p? shared_ptr<T>( r, p ): shared_ptr<T>();
906}
907
908template<class T, class U> shared_ptr<T> reinterpret_pointer_cast( shared_ptr<U> const & r ) BOOST_SP_NOEXCEPT
909{
910 (void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
911
912 typedef typename shared_ptr<T>::element_type E;
913
914 E * p = reinterpret_cast< E* >( r.get() );
915 return shared_ptr<T>( r, p );
916}
917
918#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
919
920template<class T, class U> shared_ptr<T> static_pointer_cast( shared_ptr<U> && r ) BOOST_SP_NOEXCEPT
921{
922 (void) static_cast< T* >( static_cast< U* >( 0 ) );
923
924 typedef typename shared_ptr<T>::element_type E;
925
926 E * p = static_cast< E* >( r.get() );
927 return shared_ptr<T>( std::move(r), p );
928}
929
930template<class T, class U> shared_ptr<T> const_pointer_cast( shared_ptr<U> && r ) BOOST_SP_NOEXCEPT
931{
932 (void) const_cast< T* >( static_cast< U* >( 0 ) );
933
934 typedef typename shared_ptr<T>::element_type E;
935
936 E * p = const_cast< E* >( r.get() );
937 return shared_ptr<T>( std::move(r), p );
938}
939
940template<class T, class U> shared_ptr<T> dynamic_pointer_cast( shared_ptr<U> && r ) BOOST_SP_NOEXCEPT
941{
942 (void) dynamic_cast< T* >( static_cast< U* >( 0 ) );
943
944 typedef typename shared_ptr<T>::element_type E;
945
946 E * p = dynamic_cast< E* >( r.get() );
947 return p? shared_ptr<T>( std::move(r), p ): shared_ptr<T>();
948}
949
950template<class T, class U> shared_ptr<T> reinterpret_pointer_cast( shared_ptr<U> && r ) BOOST_SP_NOEXCEPT
951{
952 (void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
953
954 typedef typename shared_ptr<T>::element_type E;
955
956 E * p = reinterpret_cast< E* >( r.get() );
957 return shared_ptr<T>( std::move(r), p );
958}
959
960#endif // !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
961
962// get_pointer() enables boost::mem_fn to recognize shared_ptr
963
964template<class T> inline typename shared_ptr<T>::element_type * get_pointer(shared_ptr<T> const & p) BOOST_SP_NOEXCEPT
965{
966 return p.get();
967}
968
969// operator<<
970
971#if !defined(BOOST_NO_IOSTREAM)
972
973#if defined(BOOST_NO_TEMPLATED_IOSTREAMS) || ( defined(__GNUC__) && (__GNUC__ < 3) )
974
975template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
976{
977 os << p.get();
978 return os;
979}
980
981#else
982
983// in STLport's no-iostreams mode no iostream symbols can be used
984#ifndef _STLP_NO_IOSTREAMS
985
986# if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300 && __SGI_STL_PORT)
987// MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL
988using std::basic_ostream;
989template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, shared_ptr<Y> const & p)
990# else
991template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p)
992# endif
993{
994 os << p.get();
995 return os;
996}
997
998#endif // _STLP_NO_IOSTREAMS
999
1000#endif // __GNUC__ < 3
1001
1002#endif // !defined(BOOST_NO_IOSTREAM)
1003
1004// get_deleter
1005
1006namespace detail
1007{
1008
1009template<class D, class T> D * basic_get_deleter( shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
1010{
1011 return static_cast<D *>( p._internal_get_deleter(BOOST_SP_TYPEID(D)) );
1012}
1013
1014template<class D, class T> D * basic_get_local_deleter( D *, shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT;
1015template<class D, class T> D const * basic_get_local_deleter( D const *, shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT;
1016
1017class esft2_deleter_wrapper
1018{
1019private:
1020
1021 shared_ptr<void const volatile> deleter_;
1022
1023public:
1024
1025 esft2_deleter_wrapper()
1026 {
1027 }
1028
1029 template< class T > void set_deleter( shared_ptr<T> const & deleter ) BOOST_SP_NOEXCEPT
1030 {
1031 deleter_ = deleter;
1032 }
1033
1034 template<typename D> D* get_deleter() const BOOST_SP_NOEXCEPT
1035 {
1036 return boost::detail::basic_get_deleter<D>( deleter_ );
1037 }
1038
1039 template< class T> void operator()( T* ) BOOST_SP_NOEXCEPT_WITH_ASSERT
1040 {
1041 BOOST_ASSERT( deleter_.use_count() <= 1 );
1042 deleter_.reset();
1043 }
1044};
1045
1046} // namespace detail
1047
1048template<class D, class T> D * get_deleter( shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
1049{
1050 D * d = boost::detail::basic_get_deleter<D>( p );
1051
1052 if( d == 0 )
1053 {
1054 d = boost::detail::basic_get_local_deleter( d, p );
1055 }
1056
1057 if( d == 0 )
1058 {
1059 boost::detail::esft2_deleter_wrapper *del_wrapper = boost::detail::basic_get_deleter<boost::detail::esft2_deleter_wrapper>(p);
1060// The following get_deleter method call is fully qualified because
1061// older versions of gcc (2.95, 3.2.3) fail to compile it when written del_wrapper->get_deleter<D>()
1062 if(del_wrapper) d = del_wrapper->::boost::detail::esft2_deleter_wrapper::get_deleter<D>();
1063 }
1064
1065 return d;
1066}
1067
1068// atomic access
1069
1070#if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
1071
1072template<class T> inline bool atomic_is_lock_free( shared_ptr<T> const * /*p*/ ) BOOST_SP_NOEXCEPT
1073{
1074 return false;
1075}
1076
1077template<class T> shared_ptr<T> atomic_load( shared_ptr<T> const * p ) BOOST_SP_NOEXCEPT
1078{
1079 boost::detail::spinlock_pool<2>::scoped_lock lock( p );
1080 return *p;
1081}
1082
1083template<class T> inline shared_ptr<T> atomic_load_explicit( shared_ptr<T> const * p, /*memory_order mo*/ int ) BOOST_SP_NOEXCEPT
1084{
1085 return atomic_load( p );
1086}
1087
1088template<class T> void atomic_store( shared_ptr<T> * p, shared_ptr<T> r ) BOOST_SP_NOEXCEPT
1089{
1090 boost::detail::spinlock_pool<2>::scoped_lock lock( p );
1091 p->swap( r );
1092}
1093
1094template<class T> inline void atomic_store_explicit( shared_ptr<T> * p, shared_ptr<T> r, /*memory_order mo*/ int ) BOOST_SP_NOEXCEPT
1095{
1096 atomic_store( p, r ); // std::move( r )
1097}
1098
1099template<class T> shared_ptr<T> atomic_exchange( shared_ptr<T> * p, shared_ptr<T> r ) BOOST_SP_NOEXCEPT
1100{
1101 boost::detail::spinlock & sp = boost::detail::spinlock_pool<2>::spinlock_for( p );
1102
1103 sp.lock();
1104 p->swap( r );
1105 sp.unlock();
1106
1107 return r; // return std::move( r )
1108}
1109
1110template<class T> shared_ptr<T> inline atomic_exchange_explicit( shared_ptr<T> * p, shared_ptr<T> r, /*memory_order mo*/ int ) BOOST_SP_NOEXCEPT
1111{
1112 return atomic_exchange( p, r ); // std::move( r )
1113}
1114
1115template<class T> bool atomic_compare_exchange( shared_ptr<T> * p, shared_ptr<T> * v, shared_ptr<T> w ) BOOST_SP_NOEXCEPT
1116{
1117 boost::detail::spinlock & sp = boost::detail::spinlock_pool<2>::spinlock_for( p );
1118
1119 sp.lock();
1120
1121 if( p->_internal_equiv( *v ) )
1122 {
1123 p->swap( w );
1124
1125 sp.unlock();
1126
1127 return true;
1128 }
1129 else
1130 {
1131 shared_ptr<T> tmp( *p );
1132
1133 sp.unlock();
1134
1135 tmp.swap( *v );
1136 return false;
1137 }
1138}
1139
1140template<class T> inline bool atomic_compare_exchange_explicit( shared_ptr<T> * p, shared_ptr<T> * v, shared_ptr<T> w, /*memory_order success*/ int, /*memory_order failure*/ int ) BOOST_SP_NOEXCEPT
1141{
1142 return atomic_compare_exchange( p, v, w ); // std::move( w )
1143}
1144
1145#endif // !defined(BOOST_SP_NO_ATOMIC_ACCESS)
1146
1147// hash_value
1148
1149template< class T > struct hash;
1150
1151template< class T > std::size_t hash_value( boost::shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
1152{
1153 return boost::hash< typename boost::shared_ptr<T>::element_type* >()( p.get() );
1154}
1155
1156} // namespace boost
1157
1158#include <boost/smart_ptr/detail/local_sp_deleter.hpp>
1159
1160namespace boost
1161{
1162
1163namespace detail
1164{
1165
1166template<class D, class T> D * basic_get_local_deleter( D *, shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
1167{
1168 return static_cast<D *>( p._internal_get_local_deleter( BOOST_SP_TYPEID(local_sp_deleter<D>) ) );
1169}
1170
1171template<class D, class T> D const * basic_get_local_deleter( D const *, shared_ptr<T> const & p ) BOOST_SP_NOEXCEPT
1172{
1173 return static_cast<D *>( p._internal_get_local_deleter( BOOST_SP_TYPEID(local_sp_deleter<D>) ) );
1174}
1175
1176} // namespace detail
1177
1178} // namespace boost
1179
1180#if defined( BOOST_SP_DISABLE_DEPRECATED )
1181#pragma GCC diagnostic pop
1182#endif
1183
1184#endif // #ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
1185