summaryrefslogtreecommitdiffstats
blob: 609cce903221ab5687ccbabc9d651348e883dc76 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
#ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
#define BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED

//
//  shared_ptr.hpp
//
//  (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
//  Copyright (c) 2001-2008 Peter Dimov
//
//  Distributed under the Boost Software License, Version 1.0. (See
//  accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)
//
//  See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation.
//

#include <boost/config.hpp>   // for broken compiler workarounds

#if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
#include <boost/smart_ptr/detail/shared_ptr_nmt.hpp>
#else

// In order to avoid circular dependencies with Boost.TR1
// we make sure that our include of <memory> doesn't try to
// pull in the TR1 headers: that's why we use this header 
// rather than including <memory> directly:
#include <boost/config/no_tr1/memory.hpp>  // std::auto_ptr

#include <boost/assert.hpp>
#include <boost/checked_delete.hpp>
#include <boost/throw_exception.hpp>
#include <boost/smart_ptr/detail/shared_count.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/smart_ptr/detail/sp_convertible.hpp>

#if !defined(BOOST_SP_NO_ATOMIC_ACCESS)
#include <boost/smart_ptr/detail/spinlock_pool.hpp>
#include <boost/memory_order.hpp>
#endif

#include <algorithm>            // for std::swap
#include <functional>           // for std::less
#include <typeinfo>             // for std::bad_cast

#if !defined(BOOST_NO_IOSTREAM)
#if !defined(BOOST_NO_IOSFWD)
#include <iosfwd>               // for std::basic_ostream
#else
#include <ostream>
#endif
#endif

#ifdef BOOST_MSVC  // moved here to work around VC++ compiler crash
# pragma warning(push)
# pragma warning(disable:4284) // odd return type for operator->
#endif

namespace boost
{

template<class T> class shared_ptr;
template<class T> class weak_ptr;
template<class T> class enable_shared_from_this;
template<class T> class enable_shared_from_this2;

namespace detail
{

struct static_cast_tag {};
struct const_cast_tag {};
struct dynamic_cast_tag {};
struct polymorphic_cast_tag {};

template<class T> struct shared_ptr_traits
{
    typedef T & reference;
};

template<> struct shared_ptr_traits<void>
{
    typedef void reference;
};

#if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)

template<> struct shared_ptr_traits<void const>
{
    typedef void reference;
};

template<> struct shared_ptr_traits<void volatile>
{
    typedef void reference;
};

template<> struct shared_ptr_traits<void const volatile>
{
    typedef void reference;
};

#endif

// enable_shared_from_this support

template< 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 )
{
    if( pe != 0 )
    {
        pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
    }
}

template< class X, class Y, class T > inline void sp_enable_shared_from_this( boost::shared_ptr<X> * ppx, Y const * py, boost::enable_shared_from_this2< T > const * pe )
{
    if( pe != 0 )
    {
        pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
    }
}

#ifdef _MANAGED

// Avoid C4793, ... causes native code generation

struct sp_any_pointer
{
    template<class T> sp_any_pointer( T* ) {}
};

inline void sp_enable_shared_from_this( sp_any_pointer, sp_any_pointer, sp_any_pointer )
{
}

#else // _MANAGED

inline void sp_enable_shared_from_this( ... )
{
}

#endif // _MANAGED

#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION ) && !defined( BOOST_NO_AUTO_PTR )

// rvalue auto_ptr support based on a technique by Dave Abrahams

template< class T, class R > struct sp_enable_if_auto_ptr
{
};

template< class T, class R > struct sp_enable_if_auto_ptr< std::auto_ptr< T >, R >
{
    typedef R type;
}; 

#endif

} // namespace detail


//
//  shared_ptr
//
//  An enhanced relative of scoped_ptr with reference counted copy semantics.
//  The object pointed to is deleted when the last shared_ptr pointing to it
//  is destroyed or reset.
//

template<class T> class shared_ptr
{
private:

    // Borland 5.5.1 specific workaround
    typedef shared_ptr<T> this_type;

public:

    typedef T element_type;
    typedef T value_type;
    typedef T * pointer;
    typedef typename boost::detail::shared_ptr_traits<T>::reference reference;

    shared_ptr(): px(0), pn() // never throws in 1.30+
    {
    }

    template<class Y>
    explicit shared_ptr( Y * p ): px( p ), pn( p ) // Y must be complete
    {
        boost::detail::sp_enable_shared_from_this( this, p, p );
    }

    //
    // Requirements: D's copy constructor must not throw
    //
    // shared_ptr will release p by calling d(p)
    //

    template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d)
    {
        boost::detail::sp_enable_shared_from_this( this, p, p );
    }

    // As above, but with allocator. A's copy constructor shall not throw.

    template<class Y, class D, class A> shared_ptr( Y * p, D d, A a ): px( p ), pn( p, d, a )
    {
        boost::detail::sp_enable_shared_from_this( this, p, p );
    }

//  generated copy constructor, destructor are fine

    template<class Y>
    explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw
    {
        // it is now safe to copy r.px, as pn(r.pn) did not throw
        px = r.px;
    }

    template<class Y>
    shared_ptr( weak_ptr<Y> const & r, boost::detail::sp_nothrow_tag ): px( 0 ), pn( r.pn, boost::detail::sp_nothrow_tag() ) // never throws
    {
        if( !pn.empty() )
        {
            px = r.px;
        }
    }

    template<class Y>
#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )

    shared_ptr( shared_ptr<Y> const & r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )

#else

    shared_ptr( shared_ptr<Y> const & r )

#endif
    : px( r.px ), pn( r.pn ) // never throws
    {
    }

    // aliasing
    template< class Y >
    shared_ptr( shared_ptr<Y> const & r, T * p ): px( p ), pn( r.pn ) // never throws
    {
    }

    template<class Y>
    shared_ptr(shared_ptr<Y> const & r, boost::detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
    {
    }

    template<class Y>
    shared_ptr(shared_ptr<Y> const & r, boost::detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
    {
    }

    template<class Y>
    shared_ptr(shared_ptr<Y> const & r, boost::detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
    {
        if(px == 0) // need to allocate new counter -- the cast failed
        {
            pn = boost::detail::shared_count();
        }
    }

    template<class Y>
    shared_ptr(shared_ptr<Y> const & r, boost::detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
    {
        if(px == 0)
        {
            boost::throw_exception(std::bad_cast());
        }
    }

#ifndef BOOST_NO_AUTO_PTR

    template<class Y>
    explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
    {
        Y * tmp = r.get();
        pn = boost::detail::shared_count(r);
        boost::detail::sp_enable_shared_from_this( this, tmp, tmp );
    }

#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )

    template<class Ap>
    explicit shared_ptr( Ap r, typename boost::detail::sp_enable_if_auto_ptr<Ap, int>::type = 0 ): px( r.get() ), pn()
    {
        typename Ap::element_type * tmp = r.get();
        pn = boost::detail::shared_count( r );
        boost::detail::sp_enable_shared_from_this( this, tmp, tmp );
    }


#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

#endif // BOOST_NO_AUTO_PTR

    // assignment

    shared_ptr & operator=( shared_ptr const & r ) // never throws
    {
        this_type(r).swap(*this);
        return *this;
    }

#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1400)

    template<class Y>
    shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
    {
        this_type(r).swap(*this);
        return *this;
    }

#endif

#ifndef BOOST_NO_AUTO_PTR

    template<class Y>
    shared_ptr & operator=( std::auto_ptr<Y> & r )
    {
        this_type(r).swap(*this);
        return *this;
    }

#if !defined( BOOST_NO_SFINAE ) && !defined( BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION )

    template<class Ap>
    typename boost::detail::sp_enable_if_auto_ptr< Ap, shared_ptr & >::type operator=( Ap r )
    {
        this_type( r ).swap( *this );
        return *this;
    }


#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

#endif // BOOST_NO_AUTO_PTR

// Move support

#if defined( BOOST_HAS_RVALUE_REFS )

    shared_ptr( shared_ptr && r ): px( r.px ), pn() // never throws
    {
        pn.swap( r.pn );
        r.px = 0;
    }

    template<class Y>
#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )

    shared_ptr( shared_ptr<Y> && r, typename boost::detail::sp_enable_if_convertible<Y,T>::type = boost::detail::sp_empty() )

#else

    shared_ptr( shared_ptr<Y> && r )

#endif
    : px( r.px ), pn() // never throws
    {
        pn.swap( r.pn );
        r.px = 0;
    }

    shared_ptr & operator=( shared_ptr && r ) // never throws
    {
        this_type( static_cast< shared_ptr && >( r ) ).swap( *this );
        return *this;
    }

    template<class Y>
    shared_ptr & operator=( shared_ptr<Y> && r ) // never throws
    {
        this_type( static_cast< shared_ptr<Y> && >( r ) ).swap( *this );
        return *this;
    }

#endif

    void reset() // never throws in 1.30+
    {
        this_type().swap(*this);
    }

    template<class Y> void reset(Y * p) // Y must be complete
    {
        BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors
        this_type(p).swap(*this);
    }

    template<class Y, class D> void reset( Y * p, D d )
    {
        this_type( p, d ).swap( *this );
    }

    template<class Y, class D, class A> void reset( Y * p, D d, A a )
    {
        this_type( p, d, a ).swap( *this );
    }

    template<class Y> void reset( shared_ptr<Y> const & r, T * p )
    {
        this_type( r, p ).swap( *this );
    }

    reference operator* () const // never throws
    {
        BOOST_ASSERT(px != 0);
        return *px;
    }

    T * operator-> () const // never throws
    {
        BOOST_ASSERT(px != 0);
        return px;
    }

    T * get() const // never throws
    {
        return px;
    }

// implicit conversion to "bool"
#include <boost/smart_ptr/detail/operator_bool.hpp>

    bool unique() const // never throws
    {
        return pn.unique();
    }

    long use_count() const // never throws
    {
        return pn.use_count();
    }

    void swap(shared_ptr<T> & other) // never throws
    {
        std::swap(px, other.px);
        pn.swap(other.pn);
    }

    template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const
    {
        return pn < rhs.pn;
    }

    void * _internal_get_deleter( boost::detail::sp_typeinfo const & ti ) const
    {
        return pn.get_deleter( ti );
    }

    bool _internal_equiv( shared_ptr const & r ) const
    {
        return px == r.px && pn == r.pn;
    }

// Tasteless as this may seem, making all members public allows member templates
// to work in the absence of member template friends. (Matthew Langston)

#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS

private:

    template<class Y> friend class shared_ptr;
    template<class Y> friend class weak_ptr;


#endif

    T * px;                     // contained pointer
    boost::detail::shared_count pn;    // reference counter

};  // shared_ptr

template<class T, class U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b)
{
    return a.get() == b.get();
}

template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b)
{
    return a.get() != b.get();
}

#if __GNUC__ == 2 && __GNUC_MINOR__ <= 96

// Resolve the ambiguity between our op!= and the one in rel_ops

template<class T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T> const & b)
{
    return a.get() != b.get();
}

#endif

template<class T, class U> inline bool operator<(shared_ptr<T> const & a, shared_ptr<U> const & b)
{
    return a._internal_less(b);
}

template<class T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b)
{
    a.swap(b);
}

template<class T, class U> shared_ptr<T> static_pointer_cast(shared_ptr<U> const & r)
{
    return shared_ptr<T>(r, boost::detail::static_cast_tag());
}

template<class T, class U> shared_ptr<T> const_pointer_cast(shared_ptr<U> const & r)
{
    return shared_ptr<T>(r, boost::detail::const_cast_tag());
}

template<class T, class U> shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const & r)
{
    return shared_ptr<T>(r, boost::detail::dynamic_cast_tag());
}

// shared_*_cast names are deprecated. Use *_pointer_cast instead.

template<class T, class U> shared_ptr<T> shared_static_cast(shared_ptr<U> const & r)
{
    return shared_ptr<T>(r, boost::detail::static_cast_tag());
}

template<class T, class U> shared_ptr<T> shared_dynamic_cast(shared_ptr<U> const & r)
{
    return shared_ptr<T>(r, boost::detail::dynamic_cast_tag());
}

template<class T, class U> shared_ptr<T> shared_polymorphic_cast(shared_ptr<U> const & r)
{
    return shared_ptr<T>(r, boost::detail::polymorphic_cast_tag());
}

template<class T, class U> shared_ptr<T> shared_polymorphic_downcast(shared_ptr<U> const & r)
{
    BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get());
    return shared_static_cast<T>(r);
}

// get_pointer() enables boost::mem_fn to recognize shared_ptr

template<class T> inline T * get_pointer(shared_ptr<T> const & p)
{
    return p.get();
}

// operator<<

#if !defined(BOOST_NO_IOSTREAM)

#if defined(BOOST_NO_TEMPLATED_IOSTREAMS) || ( defined(__GNUC__) &&  (__GNUC__ < 3) )

template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
{
    os << p.get();
    return os;
}

#else

// in STLport's no-iostreams mode no iostream symbols can be used
#ifndef _STLP_NO_IOSTREAMS

# if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300 && __SGI_STL_PORT)
// MSVC6 has problems finding std::basic_ostream through the using declaration in namespace _STL
using std::basic_ostream;
template<class E, class T, class Y> basic_ostream<E, T> & operator<< (basic_ostream<E, T> & os, shared_ptr<Y> const & p)
# else
template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p)
# endif
{
    os << p.get();
    return os;
}

#endif // _STLP_NO_IOSTREAMS

#endif // __GNUC__ < 3

#endif // !defined(BOOST_NO_IOSTREAM)

// get_deleter

#if ( defined(__GNUC__) && BOOST_WORKAROUND(__GNUC__, < 3) ) || \
    ( defined(__EDG_VERSION__) && BOOST_WORKAROUND(__EDG_VERSION__, <= 238) ) || \
    ( defined(__HP_aCC) && BOOST_WORKAROUND(__HP_aCC, <= 33500) )

// g++ 2.9x doesn't allow static_cast<X const *>(void *)
// apparently EDG 2.38 and HP aCC A.03.35 also don't accept it

template<class D, class T> D * get_deleter(shared_ptr<T> const & p)
{
    void const * q = p._internal_get_deleter(BOOST_SP_TYPEID(D));
    return const_cast<D *>(static_cast<D const *>(q));
}

#else

template<class D, class T> D * get_deleter(shared_ptr<T> const & p)
{
    return static_cast<D *>(p._internal_get_deleter(BOOST_SP_TYPEID(D)));
}

#endif

// atomic access

#if !defined(BOOST_SP_NO_ATOMIC_ACCESS)

template<class T> inline bool atomic_is_lock_free( shared_ptr<T> const * /*p*/ )
{
    return false;
}

template<class T> shared_ptr<T> atomic_load( shared_ptr<T> const * p )
{
    boost::detail::spinlock_pool<2>::scoped_lock lock( p );
    return *p;
}

template<class T> inline shared_ptr<T> atomic_load_explicit( shared_ptr<T> const * p, memory_order /*mo*/ )
{
    return atomic_load( p );
}

template<class T> void atomic_store( shared_ptr<T> * p, shared_ptr<T> r )
{
    boost::detail::spinlock_pool<2>::scoped_lock lock( p );
    p->swap( r );
}

template<class T> inline void atomic_store_explicit( shared_ptr<T> * p, shared_ptr<T> r, memory_order /*mo*/ )
{
    atomic_store( p, r ); // std::move( r )
}

template<class T> shared_ptr<T> atomic_exchange( shared_ptr<T> * p, shared_ptr<T> r )
{
    boost::detail::spinlock & sp = boost::detail::spinlock_pool<2>::spinlock_for( p );

    sp.lock();
    p->swap( r );
    sp.unlock();

    return r; // return std::move( r )
}

template<class T> shared_ptr<T> atomic_exchange_explicit( shared_ptr<T> * p, shared_ptr<T> r, memory_order /*mo*/ )
{
    return atomic_exchange( p, r ); // std::move( r )
}

template<class T> bool atomic_compare_exchange( shared_ptr<T> * p, shared_ptr<T> * v, shared_ptr<T> w )
{
    boost::detail::spinlock & sp = boost::detail::spinlock_pool<2>::spinlock_for( p );

    sp.lock();

    if( p->_internal_equiv( *v ) )
    {
        p->swap( w );

        sp.unlock();

        return true;
    }
    else
    {
        shared_ptr<T> tmp( *p );

        sp.unlock();

        tmp.swap( *v );
        return false;
    }
}

template<class T> inline bool atomic_compare_exchange_explicit( shared_ptr<T> * p, shared_ptr<T> * v, shared_ptr<T> w, memory_order /*success*/, memory_order /*failure*/ )
{
    return atomic_compare_exchange( p, v, w ); // std::move( w )
}

#endif

} // namespace boost

#ifdef BOOST_MSVC
# pragma warning(pop)
#endif

#endif  // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)

#endif  // #ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED