// shared_ptr.hpp
//
// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
-// Copyright (c) 2001-2006 Peter Dimov
+// 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
// 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/detail/shared_ptr_nmt.hpp>
-#else
-
-#include <memory> // for std::auto_ptr
-
-#include <boost/assert.hpp>
-#include <boost/checked_delete.hpp>
-#include <boost/throw_exception.hpp>
-#include <boost/detail/shared_count.hpp>
-#include <boost/detail/workaround.hpp>
-
-#include <algorithm> // for std::swap
-#include <functional> // for std::less
-#include <typeinfo> // for std::bad_cast
-#include <iosfwd> // for std::basic_ostream
-
-#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 weak_ptr;
-template<class T> class enable_shared_from_this;
-
-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 T, class Y> void sp_enable_shared_from_this( shared_count const & pn, boost::enable_shared_from_this<T> const * pe, Y const * px )
-{
- if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn);
-}
-
-#ifdef sgi
-// Turn off: the last argument of the varargs function "sp_enable_shared_from_this" is unnamed
-# pragma set woff 3506
-#endif
-
-inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... )
-{
-}
-
-#ifdef sgi
-# pragma reset woff 3506
-#endif
-
-#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( pn, 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( pn, 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( pn, p, p );
- }
-
-// generated copy constructor, assignment, destructor are fine...
-
-// except that Borland C++ has a bug, and g++ with -Wsynth warns
-#if defined(__BORLANDC__) || defined(__GNUC__)
-
- shared_ptr & operator=(shared_ptr const & r) // never throws
- {
- px = r.px;
- pn = r.pn; // shared_count::op= doesn't throw
- return *this;
- }
-
-#endif
-
- 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(shared_ptr<Y> const & r): px(r.px), 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( pn, 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( pn, tmp, tmp );
- }
-
-
-#endif // BOOST_NO_SFINAE, BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-
-#endif // BOOST_NO_AUTO_PTR
-
-#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300)
-
- template<class Y>
- shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
- {
- px = r.px;
- pn = r.pn; // shared_count::op= doesn't throw
- 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
-
- 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 );
- }
-
- 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"
-
-#if defined(__SUNPRO_CC) && BOOST_WORKAROUND(__SUNPRO_CC, <= 0x580)
-
- operator bool () const
- {
- return px != 0;
- }
-
-#elif defined( _MANAGED )
-
- static void unspecified_bool( this_type*** )
- {
- }
-
- typedef void (*unspecified_bool_type)( this_type*** );
-
- operator unspecified_bool_type() const // never throws
- {
- return px == 0? 0: unspecified_bool;
- }
-
-#elif \
- ( defined(__MWERKS__) && BOOST_WORKAROUND(__MWERKS__, < 0x3200) ) || \
- ( defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 304) )
-
- typedef T * (this_type::*unspecified_bool_type)() const;
-
- operator unspecified_bool_type() const // never throws
- {
- return px == 0? 0: &this_type::get;
- }
-
-#else
-
- typedef T * this_type::*unspecified_bool_type;
-
- operator unspecified_bool_type() const // never throws
- {
- return px == 0? 0: &this_type::px;
- }
-
-#endif
-
- // operator! is redundant, but some compilers need it
-
- bool operator! () const // never throws
- {
- return px == 0;
- }
-
- 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(std::type_info const & ti) const
- {
- return pn.get_deleter(ti);
- }
-
-// 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(__GNUC__) && (__GNUC__ < 3)
-
-template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
-{
- os << p.get();
- return os;
-}
-
-#else
-
-# 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
-
-// get_deleter (experimental)
-
-#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(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(typeid(D)));
-}
-
-#endif
-
-} // namespace boost
-
-#ifdef BOOST_MSVC
-# pragma warning(pop)
-#endif
-
-#endif // #if defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(BOOST_MSVC6_MEMBER_TEMPLATES)
+#include <boost/smart_ptr/shared_ptr.hpp>
#endif // #ifndef BOOST_SHARED_PTR_HPP_INCLUDED
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