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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/boost/smart_ptr/shared_ptr.hpp
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+#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