Chris@16: #ifndef BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED
Chris@16: #define BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED
Chris@16: 
Chris@16: // MS compatible compilers support #pragma once
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: //
Chris@16: //  detail/shared_count.hpp
Chris@16: //
Chris@16: //  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
Chris@16: //  Copyright 2004-2005 Peter Dimov
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: 
Chris@16: #ifdef __BORLANDC__
Chris@16: # pragma warn -8027     // Functions containing try are not expanded inline
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/checked_delete.hpp>
Chris@16: #include <boost/throw_exception.hpp>
Chris@16: #include <boost/smart_ptr/bad_weak_ptr.hpp>
Chris@16: #include <boost/smart_ptr/detail/sp_counted_base.hpp>
Chris@16: #include <boost/smart_ptr/detail/sp_counted_impl.hpp>
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: // In order to avoid circular dependencies with Boost.TR1
Chris@16: // we make sure that our include of <memory> doesn't try to
Chris@16: // pull in the TR1 headers: that's why we use this header 
Chris@16: // rather than including <memory> directly:
Chris@16: #include <boost/config/no_tr1/memory.hpp>  // std::auto_ptr
Chris@16: #include <functional>       // std::less
Chris@16: 
Chris@16: #ifdef BOOST_NO_EXCEPTIONS
Chris@16: # include <new>              // std::bad_alloc
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined( BOOST_NO_CXX11_SMART_PTR )
Chris@16: # include <boost/utility/addressof.hpp>
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16: 
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16: 
Chris@16: int const shared_count_id = 0x2C35F101;
Chris@16: int const   weak_count_id = 0x298C38A4;
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: struct sp_nothrow_tag {};
Chris@16: 
Chris@16: template< class D > struct sp_inplace_tag
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: #if !defined( BOOST_NO_CXX11_SMART_PTR )
Chris@16: 
Chris@16: template< class T > class sp_reference_wrapper
Chris@16: { 
Chris@16: public:
Chris@16: 
Chris@16:     explicit sp_reference_wrapper( T & t): t_( boost::addressof( t ) )
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     template< class Y > void operator()( Y * p ) const
Chris@16:     {
Chris@16:         (*t_)( p );
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16: 
Chris@16:     T * t_;
Chris@16: };
Chris@16: 
Chris@16: template< class D > struct sp_convert_reference
Chris@16: {
Chris@16:     typedef D type;
Chris@16: };
Chris@16: 
Chris@16: template< class D > struct sp_convert_reference< D& >
Chris@16: {
Chris@16:     typedef sp_reference_wrapper< D > type;
Chris@16: };
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: class weak_count;
Chris@16: 
Chris@16: class shared_count
Chris@16: {
Chris@16: private:
Chris@16: 
Chris@16:     sp_counted_base * pi_;
Chris@16: 
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:     int id_;
Chris@16: #endif
Chris@16: 
Chris@16:     friend class weak_count;
Chris@16: 
Chris@16: public:
Chris@16: 
Chris@16:     shared_count(): pi_(0) // nothrow
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     template<class Y> explicit shared_count( Y * p ): pi_( 0 )
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16: #ifndef BOOST_NO_EXCEPTIONS
Chris@16: 
Chris@16:         try
Chris@16:         {
Chris@16:             pi_ = new sp_counted_impl_p<Y>( p );
Chris@16:         }
Chris@16:         catch(...)
Chris@16:         {
Chris@16:             boost::checked_delete( p );
Chris@16:             throw;
Chris@16:         }
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16:         pi_ = new sp_counted_impl_p<Y>( p );
Chris@16: 
Chris@16:         if( pi_ == 0 )
Chris@16:         {
Chris@16:             boost::checked_delete( p );
Chris@16:             boost::throw_exception( std::bad_alloc() );
Chris@16:         }
Chris@16: 
Chris@16: #endif
Chris@16:     }
Chris@16: 
Chris@16: #if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, <= 1200 )
Chris@16:     template<class Y, class D> shared_count( Y * p, D d ): pi_(0)
Chris@16: #else
Chris@16:     template<class P, class D> shared_count( P p, D d ): pi_(0)
Chris@16: #endif
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16: #if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, <= 1200 )
Chris@16:         typedef Y* P;
Chris@16: #endif
Chris@16: #ifndef BOOST_NO_EXCEPTIONS
Chris@16: 
Chris@16:         try
Chris@16:         {
Chris@16:             pi_ = new sp_counted_impl_pd<P, D>(p, d);
Chris@16:         }
Chris@16:         catch(...)
Chris@16:         {
Chris@16:             d(p); // delete p
Chris@16:             throw;
Chris@16:         }
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16:         pi_ = new sp_counted_impl_pd<P, D>(p, d);
Chris@16: 
Chris@16:         if(pi_ == 0)
Chris@16:         {
Chris@16:             d(p); // delete p
Chris@16:             boost::throw_exception(std::bad_alloc());
Chris@16:         }
Chris@16: 
Chris@16: #endif
Chris@16:     }
Chris@16: 
Chris@16: #if !defined( BOOST_NO_FUNCTION_TEMPLATE_ORDERING )
Chris@16: 
Chris@16:     template< class P, class D > shared_count( P p, sp_inplace_tag<D> ): pi_( 0 )
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16: #ifndef BOOST_NO_EXCEPTIONS
Chris@16: 
Chris@16:         try
Chris@16:         {
Chris@16:             pi_ = new sp_counted_impl_pd< P, D >( p );
Chris@16:         }
Chris@16:         catch( ... )
Chris@16:         {
Chris@16:             D::operator_fn( p ); // delete p
Chris@16:             throw;
Chris@16:         }
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16:         pi_ = new sp_counted_impl_pd< P, D >( p );
Chris@16: 
Chris@16:         if( pi_ == 0 )
Chris@16:         {
Chris@16:             D::operator_fn( p ); // delete p
Chris@16:             boost::throw_exception( std::bad_alloc() );
Chris@16:         }
Chris@16: 
Chris@16: #endif // #ifndef BOOST_NO_EXCEPTIONS
Chris@16:     }
Chris@16: 
Chris@16: #endif // !defined( BOOST_NO_FUNCTION_TEMPLATE_ORDERING )
Chris@16: 
Chris@16:     template<class P, class D, class A> shared_count( P p, D d, A a ): pi_( 0 )
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:         typedef sp_counted_impl_pda<P, D, A> impl_type;
Chris@101: 
Chris@101: #if !defined( BOOST_NO_CXX11_ALLOCATOR )
Chris@101: 
Chris@101:         typedef typename std::allocator_traits<A>::template rebind_alloc< impl_type > A2;
Chris@101: 
Chris@101: #else
Chris@101: 
Chris@16:         typedef typename A::template rebind< impl_type >::other A2;
Chris@16: 
Chris@101: #endif
Chris@101: 
Chris@16:         A2 a2( a );
Chris@16: 
Chris@16: #ifndef BOOST_NO_EXCEPTIONS
Chris@16: 
Chris@16:         try
Chris@16:         {
Chris@101: #if !defined( BOOST_NO_CXX11_ALLOCATOR )
Chris@101: 
Chris@101:             impl_type * pi = std::allocator_traits<A2>::allocate( a2, 1 );
Chris@101:             pi_ = pi;
Chris@101:             std::allocator_traits<A2>::construct( a2, pi, p, d, a );
Chris@101: 
Chris@101: #else
Chris@101: 
Chris@16:             pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) );
Chris@101:             ::new( static_cast< void* >( pi_ ) ) impl_type( p, d, a );
Chris@101: 
Chris@101: #endif
Chris@16:         }
Chris@16:         catch(...)
Chris@16:         {
Chris@16:             d( p );
Chris@16: 
Chris@16:             if( pi_ != 0 )
Chris@16:             {
Chris@16:                 a2.deallocate( static_cast< impl_type* >( pi_ ), 1 );
Chris@16:             }
Chris@16: 
Chris@16:             throw;
Chris@16:         }
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@101: #if !defined( BOOST_NO_CXX11_ALLOCATOR )
Chris@101: 
Chris@101:         impl_type * pi = std::allocator_traits<A2>::allocate( a2, 1 );
Chris@101:         pi_ = pi;
Chris@101: 
Chris@101: #else
Chris@101: 
Chris@16:         pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) );
Chris@16: 
Chris@101: #endif
Chris@101: 
Chris@16:         if( pi_ != 0 )
Chris@16:         {
Chris@101: #if !defined( BOOST_NO_CXX11_ALLOCATOR )
Chris@101: 
Chris@101:             std::allocator_traits<A2>::construct( a2, pi, p, d, a );
Chris@101: 
Chris@101: #else
Chris@101: 
Chris@101:             ::new( static_cast< void* >( pi_ ) ) impl_type( p, d, a );
Chris@101: 
Chris@101: #endif
Chris@16:         }
Chris@16:         else
Chris@16:         {
Chris@16:             d( p );
Chris@16:             boost::throw_exception( std::bad_alloc() );
Chris@16:         }
Chris@16: 
Chris@16: #endif
Chris@16:     }
Chris@16: 
Chris@16: #if !defined( BOOST_NO_FUNCTION_TEMPLATE_ORDERING )
Chris@16: 
Chris@16:     template< class P, class D, class A > shared_count( P p, sp_inplace_tag< D >, A a ): pi_( 0 )
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:         typedef sp_counted_impl_pda< P, D, A > impl_type;
Chris@101: 
Chris@101: #if !defined( BOOST_NO_CXX11_ALLOCATOR )
Chris@101: 
Chris@101:         typedef typename std::allocator_traits<A>::template rebind_alloc< impl_type > A2;
Chris@101: 
Chris@101: #else
Chris@101: 
Chris@16:         typedef typename A::template rebind< impl_type >::other A2;
Chris@16: 
Chris@101: #endif
Chris@101: 
Chris@16:         A2 a2( a );
Chris@16: 
Chris@16: #ifndef BOOST_NO_EXCEPTIONS
Chris@16: 
Chris@16:         try
Chris@16:         {
Chris@101: #if !defined( BOOST_NO_CXX11_ALLOCATOR )
Chris@101: 
Chris@101:             impl_type * pi = std::allocator_traits<A2>::allocate( a2, 1 );
Chris@101:             pi_ = pi;
Chris@101:             std::allocator_traits<A2>::construct( a2, pi, p, a );
Chris@101: 
Chris@101: #else
Chris@101: 
Chris@16:             pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) );
Chris@101:             ::new( static_cast< void* >( pi_ ) ) impl_type( p, a );
Chris@101: 
Chris@101: #endif
Chris@16:         }
Chris@16:         catch(...)
Chris@16:         {
Chris@16:             D::operator_fn( p );
Chris@16: 
Chris@16:             if( pi_ != 0 )
Chris@16:             {
Chris@16:                 a2.deallocate( static_cast< impl_type* >( pi_ ), 1 );
Chris@16:             }
Chris@16: 
Chris@16:             throw;
Chris@16:         }
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@101: #if !defined( BOOST_NO_CXX11_ALLOCATOR )
Chris@101: 
Chris@101:         impl_type * pi = std::allocator_traits<A2>::allocate( a2, 1 );
Chris@101:         pi_ = pi;
Chris@101: 
Chris@101: #else
Chris@101: 
Chris@16:         pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) );
Chris@16: 
Chris@101: #endif
Chris@101: 
Chris@16:         if( pi_ != 0 )
Chris@16:         {
Chris@101: #if !defined( BOOST_NO_CXX11_ALLOCATOR )
Chris@101: 
Chris@101:             std::allocator_traits<A2>::construct( a2, pi, p, a );
Chris@101: 
Chris@101: #else
Chris@101: 
Chris@101:             ::new( static_cast< void* >( pi_ ) ) impl_type( p, a );
Chris@101: 
Chris@101: #endif
Chris@16:         }
Chris@16:         else
Chris@16:         {
Chris@16:             D::operator_fn( p );
Chris@16:             boost::throw_exception( std::bad_alloc() );
Chris@16:         }
Chris@16: 
Chris@16: #endif // #ifndef BOOST_NO_EXCEPTIONS
Chris@16:     }
Chris@16: 
Chris@16: #endif // !defined( BOOST_NO_FUNCTION_TEMPLATE_ORDERING )
Chris@16: 
Chris@16: #ifndef BOOST_NO_AUTO_PTR
Chris@16: 
Chris@16:     // auto_ptr<Y> is special cased to provide the strong guarantee
Chris@16: 
Chris@16:     template<class Y>
Chris@16:     explicit shared_count( std::auto_ptr<Y> & r ): pi_( new sp_counted_impl_p<Y>( r.get() ) )
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16: #ifdef BOOST_NO_EXCEPTIONS
Chris@16: 
Chris@16:         if( pi_ == 0 )
Chris@16:         {
Chris@16:             boost::throw_exception(std::bad_alloc());
Chris@16:         }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:         r.release();
Chris@16:     }
Chris@16: 
Chris@16: #endif 
Chris@16: 
Chris@16: #if !defined( BOOST_NO_CXX11_SMART_PTR )
Chris@16: 
Chris@16:     template<class Y, class D>
Chris@16:     explicit shared_count( std::unique_ptr<Y, D> & r ): pi_( 0 )
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:         typedef typename sp_convert_reference<D>::type D2;
Chris@16: 
Chris@16:         D2 d2( r.get_deleter() );
Chris@16:         pi_ = new sp_counted_impl_pd< typename std::unique_ptr<Y, D>::pointer, D2 >( r.get(), d2 );
Chris@16: 
Chris@16: #ifdef BOOST_NO_EXCEPTIONS
Chris@16: 
Chris@16:         if( pi_ == 0 )
Chris@16:         {
Chris@16:             boost::throw_exception( std::bad_alloc() );
Chris@16:         }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:         r.release();
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:     ~shared_count() // nothrow
Chris@16:     {
Chris@16:         if( pi_ != 0 ) pi_->release();
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         id_ = 0;
Chris@16: #endif
Chris@16:     }
Chris@16: 
Chris@16:     shared_count(shared_count const & r): pi_(r.pi_) // nothrow
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:         if( pi_ != 0 ) pi_->add_ref_copy();
Chris@16:     }
Chris@16: 
Chris@16: #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
Chris@16: 
Chris@16:     shared_count(shared_count && r): pi_(r.pi_) // nothrow
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:         r.pi_ = 0;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:     explicit shared_count(weak_count const & r); // throws bad_weak_ptr when r.use_count() == 0
Chris@16:     shared_count( weak_count const & r, sp_nothrow_tag ); // constructs an empty *this when r.use_count() == 0
Chris@16: 
Chris@16:     shared_count & operator= (shared_count const & r) // nothrow
Chris@16:     {
Chris@16:         sp_counted_base * tmp = r.pi_;
Chris@16: 
Chris@16:         if( tmp != pi_ )
Chris@16:         {
Chris@16:             if( tmp != 0 ) tmp->add_ref_copy();
Chris@16:             if( pi_ != 0 ) pi_->release();
Chris@16:             pi_ = tmp;
Chris@16:         }
Chris@16: 
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     void swap(shared_count & r) // nothrow
Chris@16:     {
Chris@16:         sp_counted_base * tmp = r.pi_;
Chris@16:         r.pi_ = pi_;
Chris@16:         pi_ = tmp;
Chris@16:     }
Chris@16: 
Chris@16:     long use_count() const // nothrow
Chris@16:     {
Chris@16:         return pi_ != 0? pi_->use_count(): 0;
Chris@16:     }
Chris@16: 
Chris@16:     bool unique() const // nothrow
Chris@16:     {
Chris@16:         return use_count() == 1;
Chris@16:     }
Chris@16: 
Chris@16:     bool empty() const // nothrow
Chris@16:     {
Chris@16:         return pi_ == 0;
Chris@16:     }
Chris@16: 
Chris@16:     friend inline bool operator==(shared_count const & a, shared_count const & b)
Chris@16:     {
Chris@16:         return a.pi_ == b.pi_;
Chris@16:     }
Chris@16: 
Chris@16:     friend inline bool operator<(shared_count const & a, shared_count const & b)
Chris@16:     {
Chris@16:         return std::less<sp_counted_base *>()( a.pi_, b.pi_ );
Chris@16:     }
Chris@16: 
Chris@16:     void * get_deleter( sp_typeinfo const & ti ) const
Chris@16:     {
Chris@16:         return pi_? pi_->get_deleter( ti ): 0;
Chris@16:     }
Chris@16: 
Chris@16:     void * get_untyped_deleter() const
Chris@16:     {
Chris@16:         return pi_? pi_->get_untyped_deleter(): 0;
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: class weak_count
Chris@16: {
Chris@16: private:
Chris@16: 
Chris@16:     sp_counted_base * pi_;
Chris@16: 
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:     int id_;
Chris@16: #endif
Chris@16: 
Chris@16:     friend class shared_count;
Chris@16: 
Chris@16: public:
Chris@16: 
Chris@16:     weak_count(): pi_(0) // nothrow
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(weak_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16:     weak_count(shared_count const & r): pi_(r.pi_) // nothrow
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(weak_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:         if(pi_ != 0) pi_->weak_add_ref();
Chris@16:     }
Chris@16: 
Chris@16:     weak_count(weak_count const & r): pi_(r.pi_) // nothrow
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(weak_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:         if(pi_ != 0) pi_->weak_add_ref();
Chris@16:     }
Chris@16: 
Chris@16: // Move support
Chris@16: 
Chris@16: #if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
Chris@16: 
Chris@16:     weak_count(weak_count && r): pi_(r.pi_) // nothrow
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(weak_count_id)
Chris@16: #endif
Chris@16:     {
Chris@16:         r.pi_ = 0;
Chris@16:     }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16:     ~weak_count() // nothrow
Chris@16:     {
Chris@16:         if(pi_ != 0) pi_->weak_release();
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         id_ = 0;
Chris@16: #endif
Chris@16:     }
Chris@16: 
Chris@16:     weak_count & operator= (shared_count const & r) // nothrow
Chris@16:     {
Chris@16:         sp_counted_base * tmp = r.pi_;
Chris@16: 
Chris@16:         if( tmp != pi_ )
Chris@16:         {
Chris@16:             if(tmp != 0) tmp->weak_add_ref();
Chris@16:             if(pi_ != 0) pi_->weak_release();
Chris@16:             pi_ = tmp;
Chris@16:         }
Chris@16: 
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     weak_count & operator= (weak_count const & r) // nothrow
Chris@16:     {
Chris@16:         sp_counted_base * tmp = r.pi_;
Chris@16: 
Chris@16:         if( tmp != pi_ )
Chris@16:         {
Chris@16:             if(tmp != 0) tmp->weak_add_ref();
Chris@16:             if(pi_ != 0) pi_->weak_release();
Chris@16:             pi_ = tmp;
Chris@16:         }
Chris@16: 
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     void swap(weak_count & r) // nothrow
Chris@16:     {
Chris@16:         sp_counted_base * tmp = r.pi_;
Chris@16:         r.pi_ = pi_;
Chris@16:         pi_ = tmp;
Chris@16:     }
Chris@16: 
Chris@16:     long use_count() const // nothrow
Chris@16:     {
Chris@16:         return pi_ != 0? pi_->use_count(): 0;
Chris@16:     }
Chris@16: 
Chris@16:     bool empty() const // nothrow
Chris@16:     {
Chris@16:         return pi_ == 0;
Chris@16:     }
Chris@16: 
Chris@16:     friend inline bool operator==(weak_count const & a, weak_count const & b)
Chris@16:     {
Chris@16:         return a.pi_ == b.pi_;
Chris@16:     }
Chris@16: 
Chris@16:     friend inline bool operator<(weak_count const & a, weak_count const & b)
Chris@16:     {
Chris@16:         return std::less<sp_counted_base *>()(a.pi_, b.pi_);
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ )
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16: {
Chris@16:     if( pi_ == 0 || !pi_->add_ref_lock() )
Chris@16:     {
Chris@16:         boost::throw_exception( boost::bad_weak_ptr() );
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: inline shared_count::shared_count( weak_count const & r, sp_nothrow_tag ): pi_( r.pi_ )
Chris@16: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
Chris@16:         , id_(shared_count_id)
Chris@16: #endif
Chris@16: {
Chris@16:     if( pi_ != 0 && !pi_->add_ref_lock() )
Chris@16:     {
Chris@16:         pi_ = 0;
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: } // namespace detail
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #ifdef __BORLANDC__
Chris@16: # pragma warn .8027     // Functions containing try are not expanded inline
Chris@16: #endif
Chris@16: 
Chris@16: #endif  // #ifndef BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED