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- #ifndef BOOSTER_SMART_PTR_SHARED_PTR_HPP_INCLUDED
- #define BOOSTER_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 <booster/config.h> // for broken compiler workarounds
-
- #include <booster/auto_ptr_inc.h>
- #include <cassert>
- #include <booster/backtrace.h>
- #include <booster/checked_delete.h>
- #include <booster/smart_ptr/shared_count.h>
- #include <booster/smart_ptr/sp_convertible.h>
-
- #include <algorithm> // for std::swap
- #include <functional> // for std::less
- #include <typeinfo> // for std::bad_cast
-
- #include <iosfwd> // for std::basic_ostream
-
- #ifdef BOOSTER_MSVC // moved here to work around VC++ compiler crash
- # pragma warning(push)
- # pragma warning(disable:4284) // odd return type for operator->
- #endif
-
- namespace booster
- {
-
- 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;
- };
-
- 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;
- };
-
- // enable_shared_from_this support
-
- template< class X, class Y, class T > inline void sp_enable_shared_from_this( booster::shared_ptr<X> const * ppx, Y const * py, booster::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( booster::shared_ptr<X> * ppx, Y const * py, booster::enable_shared_from_this2< T > const * pe )
- {
- if( pe != 0 )
- {
- pe->_internal_accept_owner( ppx, const_cast< Y* >( py ) );
- }
- }
-
- inline void sp_enable_shared_from_this( ... )
- {
- }
-
-
- // 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;
- };
-
- } // 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 booster::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
- {
- booster::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)
- {
- booster::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 )
- {
- booster::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, booster::detail::sp_nothrow_tag ): px( 0 ), pn( r.pn, booster::detail::sp_nothrow_tag() ) // never throws
- {
- if( !pn.empty() )
- {
- px = r.px;
- }
- }
-
- template<class Y>
- shared_ptr( shared_ptr<Y> const & r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() )
- : 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, booster::detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
- {
- }
-
- template<class Y>
- shared_ptr(shared_ptr<Y> const & r, booster::detail::const_cast_tag): px(const_cast<element_type *>(r.px)), pn(r.pn)
- {
- }
-
- template<class Y>
- shared_ptr(shared_ptr<Y> const & r, booster::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 = booster::detail::shared_count();
- }
- }
-
- template<class Y>
- shared_ptr(shared_ptr<Y> const & r, booster::detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
- {
- if(px == 0)
- {
- throw booster::bad_cast();
- }
- }
-
- template<class Y>
- explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn()
- {
- Y * tmp = r.get();
- pn = booster::detail::shared_count(r);
- booster::detail::sp_enable_shared_from_this( this, tmp, tmp );
- }
-
- template<class Ap>
- explicit shared_ptr( Ap r, typename booster::detail::sp_enable_if_auto_ptr<Ap, int>::type = 0 ): px( r.get() ), pn()
- {
- typename Ap::element_type * tmp = r.get();
- pn = booster::detail::shared_count( r );
- booster::detail::sp_enable_shared_from_this( this, tmp, tmp );
- }
-
-
- // assignment
-
- shared_ptr & operator=( shared_ptr const & r ) // never throws
- {
- this_type(r).swap(*this);
- return *this;
- }
-
- template<class Y>
- shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
- {
- this_type(r).swap(*this);
- return *this;
- }
-
-
- template<class Y>
- shared_ptr & operator=( std::auto_ptr<Y> & r )
- {
- this_type(r).swap(*this);
- return *this;
- }
-
- template<class Ap>
- typename booster::detail::sp_enable_if_auto_ptr< Ap, shared_ptr & >::type operator=( Ap r )
- {
- this_type( r ).swap( *this );
- return *this;
- }
-
- // Move support
-
- void reset() // never throws in 1.30+
- {
- this_type().swap(*this);
- }
-
- template<class Y> void reset(Y * p) // Y must be complete
- {
- 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
- {
- assert(px != 0);
- return *px;
- }
-
- T * operator-> () const // never throws
- {
- assert(px != 0);
- return px;
- }
-
- T * get() const // never throws
- {
- return px;
- }
-
- // implicit conversion to "bool"
- #include <booster/smart_ptr/operator_bool.h>
-
- 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)
-
- private:
-
- template<class Y> friend class shared_ptr;
- template<class Y> friend class weak_ptr;
-
- T * px; // contained pointer
- booster::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();
- }
-
- 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, booster::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, booster::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, booster::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, booster::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, booster::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, booster::detail::polymorphic_cast_tag());
- }
-
- template<class T, class U> shared_ptr<T> shared_polymorphic_downcast(shared_ptr<U> const & r)
- {
- 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<<
-
- template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
- {
- os << p.get();
- return os;
- }
-
- // get_deleter
-
- template<class D, class T> D * get_deleter(shared_ptr<T> const & p)
- {
- return static_cast<D *>(p._internal_get_deleter(BOOSTER_SP_TYPEID(D)));
- }
-
- } // namespace boost
-
- #ifdef BOOSTER_MSVC
- # pragma warning(pop)
- #endif
-
- #endif // #ifndef BOOST_SMART_PTR_SHARED_PTR_HPP_INCLUDED
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