1 #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED
2 #define BOOST_SHARED_PTR_132_HPP_INCLUDED
7 // (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
8 // Copyright (c) 2001, 2002, 2003 Peter Dimov
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)
14 // See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation.
17 #include <boost/config.hpp> // for broken compiler workarounds
19 #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
20 #include <boost/serialization/detail/shared_ptr_nmt_132.hpp>
23 #include <boost/assert.hpp>
24 #include <boost/checked_delete.hpp>
25 #include <boost/serialization/throw_exception.hpp>
26 #include <boost/detail/workaround.hpp>
28 #include <boost/serialization/access.hpp>
29 #include <boost/serialization/detail/shared_count_132.hpp>
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
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->
44 template<class T> class weak_ptr;
45 template<class T> class enable_shared_from_this;
50 struct static_cast_tag {};
51 struct const_cast_tag {};
52 struct dynamic_cast_tag {};
53 struct polymorphic_cast_tag {};
55 template<class T> struct shared_ptr_traits
57 typedef T & reference;
60 template<> struct shared_ptr_traits<void>
62 typedef void reference;
65 #if !defined(BOOST_NO_CV_VOID_SPECIALIZATIONS)
67 template<> struct shared_ptr_traits<void const>
69 typedef void reference;
72 template<> struct shared_ptr_traits<void volatile>
74 typedef void reference;
77 template<> struct shared_ptr_traits<void const volatile>
79 typedef void reference;
84 // enable_shared_from_this support
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 )
88 if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn);
91 inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... )
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.
106 template<class T> class shared_ptr
109 // Borland 5.5.1 specific workaround
110 typedef shared_ptr< T > this_type;
114 typedef T element_type;
115 typedef T value_type;
117 typedef typename detail::shared_ptr_traits< T >::reference reference;
119 shared_ptr(): px(0), pn() // never throws in 1.30+
124 explicit shared_ptr(Y * p): px(p), pn(p, boost::checked_deleter<Y>()) // Y must be complete
126 detail::sp_enable_shared_from_this( pn, p, p );
130 // Requirements: D's copy constructor must not throw
132 // shared_ptr will release p by calling d(p)
135 template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d)
137 detail::sp_enable_shared_from_this( pn, p, p );
140 // generated copy constructor, assignment, destructor are fine...
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
147 pn = r.pn; // shared_count::op= doesn't throw
153 explicit shared_ptr(weak_ptr<Y> const & r): pn(r.pn) // may throw
155 // it is now safe to copy r.px, as pn(r.pn) did not throw
160 shared_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws
165 shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
170 shared_ptr(shared_ptr<Y> const & r, detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
175 shared_ptr(shared_ptr<Y> const & r, detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
177 if(px == 0) // need to allocate new counter -- the cast failed
179 pn = detail::shared_count();
184 shared_ptr(shared_ptr<Y> const & r, detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
188 boost::serialization::throw_exception(std::bad_cast());
192 #ifndef BOOST_NO_AUTO_PTR
195 explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
198 pn = detail::shared_count(r);
199 detail::sp_enable_shared_from_this( pn, tmp, tmp );
204 #if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
207 shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
210 pn = r.pn; // shared_count::op= doesn't throw
216 #ifndef BOOST_NO_AUTO_PTR
219 shared_ptr & operator=(std::auto_ptr<Y> & r)
221 this_type(r).swap(*this);
227 void reset() // never throws in 1.30+
229 this_type().swap(*this);
232 template<class Y> void reset(Y * p) // Y must be complete
234 BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors
235 this_type(p).swap(*this);
238 template<class Y, class D> void reset(Y * p, D d)
240 this_type(p, d).swap(*this);
243 reference operator* () const // never throws
245 BOOST_ASSERT(px != 0);
249 T * operator-> () const // never throws
251 BOOST_ASSERT(px != 0);
255 T * get() const // never throws
260 // implicit conversion to "bool"
262 #if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x530)
264 operator bool () const
269 #elif defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003))
270 typedef T * (this_type::*unspecified_bool_type)() const;
272 operator unspecified_bool_type() const // never throws
274 return px == 0? 0: &this_type::get;
279 typedef T * this_type::*unspecified_bool_type;
281 operator unspecified_bool_type() const // never throws
283 return px == 0? 0: &this_type::px;
288 // operator! is redundant, but some compilers need it
290 bool operator! () const // never throws
295 bool unique() const // never throws
300 long use_count() const // never throws
302 return pn.use_count();
305 void swap(shared_ptr< T > & other) // never throws
307 std::swap(px, other.px);
311 template<class Y> bool _internal_less(shared_ptr<Y> const & rhs) const
316 void * _internal_get_deleter(std::type_info const & ti) const
318 return pn.get_deleter(ti);
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)
324 #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
328 template<class Y> friend class shared_ptr;
329 template<class Y> friend class weak_ptr;
333 public: // for serialization
334 T * px; // contained pointer
335 detail::shared_count pn; // reference counter
339 template<class T, class U> inline bool operator==(shared_ptr< T > const & a, shared_ptr<U> const & b)
341 return a.get() == b.get();
344 template<class T, class U> inline bool operator!=(shared_ptr< T > const & a, shared_ptr<U> const & b)
346 return a.get() != b.get();
349 template<class T, class U> inline bool operator<(shared_ptr< T > const & a, shared_ptr<U> const & b)
351 return a._internal_less(b);
354 template<class T> inline void swap(shared_ptr< T > & a, shared_ptr< T > & b)
359 template<class T, class U> shared_ptr< T > static_pointer_cast(shared_ptr<U> const & r)
361 return shared_ptr< T >(r, detail::static_cast_tag());
364 template<class T, class U> shared_ptr< T > const_pointer_cast(shared_ptr<U> const & r)
366 return shared_ptr< T >(r, detail::const_cast_tag());
369 template<class T, class U> shared_ptr< T > dynamic_pointer_cast(shared_ptr<U> const & r)
371 return shared_ptr< T >(r, detail::dynamic_cast_tag());
374 // shared_*_cast names are deprecated. Use *_pointer_cast instead.
376 template<class T, class U> shared_ptr< T > shared_static_cast(shared_ptr<U> const & r)
378 return shared_ptr< T >(r, detail::static_cast_tag());
381 template<class T, class U> shared_ptr< T > shared_dynamic_cast(shared_ptr<U> const & r)
383 return shared_ptr< T >(r, detail::dynamic_cast_tag());
386 template<class T, class U> shared_ptr< T > shared_polymorphic_cast(shared_ptr<U> const & r)
388 return shared_ptr< T >(r, detail::polymorphic_cast_tag());
391 template<class T, class U> shared_ptr< T > shared_polymorphic_downcast(shared_ptr<U> const & r)
393 BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get());
394 return shared_static_cast< T >(r);
397 // get_pointer() enables boost::mem_fn to recognize shared_ptr
399 template<class T> inline T * get_pointer(shared_ptr< T > const & p)
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)
413 // get_deleter (experimental)
415 #if defined(__EDG_VERSION__) && (__EDG_VERSION__ <= 238)
417 // g++ 2.9x doesn't allow static_cast<X const *>(void *)
418 // apparently EDG 2.38 also doesn't accept it
420 template<class D, class T> D * get_deleter(shared_ptr< T > const & p)
422 void const * q = p._internal_get_deleter(typeid(D));
423 return const_cast<D *>(static_cast<D const *>(q));
428 template<class D, class T> D * get_deleter(shared_ptr< T > const & p)
430 return static_cast<D *>(p._internal_get_deleter(typeid(D)));
438 # pragma warning(pop)
441 #endif // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
443 #endif // #ifndef BOOST_SHARED_PTR_132_HPP_INCLUDED