-#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;

-

-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 ) );

- }

-}

-

-#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 detail::sp_enable_if_convertible<Y,T>::type = 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 detail::sp_enable_if_convertible<Y,T>::type = 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( 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