sl@0: #ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED
sl@0: #define BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED
sl@0: 
sl@0: // MS compatible compilers support #pragma once
sl@0: 
sl@0: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
sl@0: # pragma once
sl@0: #endif
sl@0: 
sl@0: //
sl@0: //  detail/shared_count.hpp
sl@0: //
sl@0: //  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
sl@0: //  Copyright 2004-2005 Peter Dimov
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: 
sl@0: #ifdef __BORLANDC__
sl@0: # pragma warn -8027     // Functions containing try are not expanded inline
sl@0: #endif
sl@0: 
sl@0: #include <boost/config.hpp>
sl@0: #include <boost/checked_delete.hpp>
sl@0: #include <boost/throw_exception.hpp>
sl@0: #include <boost/detail/bad_weak_ptr.hpp>
sl@0: #include <boost/detail/sp_counted_base.hpp>
sl@0: #include <boost/detail/sp_counted_impl.hpp>
sl@0: 
sl@0: #include <memory>           // std::auto_ptr
sl@0: #include <functional>       // std::less
sl@0: #include <new>              // std::bad_alloc
sl@0: #include <typeinfo>         // std::type_info in get_deleter
sl@0: 
sl@0: namespace boost
sl@0: {
sl@0: 
sl@0: namespace detail
sl@0: {
sl@0: 
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0: 
sl@0: int const shared_count_id = 0x2C35F101;
sl@0: int const   weak_count_id = 0x298C38A4;
sl@0: 
sl@0: #endif
sl@0: 
sl@0: class weak_count;
sl@0: 
sl@0: class shared_count
sl@0: {
sl@0: private:
sl@0: 
sl@0:     sp_counted_base * pi_;
sl@0: 
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:     int id_;
sl@0: #endif
sl@0: 
sl@0:     friend class weak_count;
sl@0: 
sl@0: public:
sl@0: 
sl@0:     shared_count(): pi_(0) // nothrow
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0:     {
sl@0:     }
sl@0: 
sl@0:     template<class Y> explicit shared_count( Y * p ): pi_( 0 )
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0:     {
sl@0: #ifndef BOOST_NO_EXCEPTIONS
sl@0: 
sl@0:         try
sl@0:         {
sl@0:             pi_ = new sp_counted_impl_p<Y>( p );
sl@0:         }
sl@0:         catch(...)
sl@0:         {
sl@0:             boost::checked_delete( p );
sl@0:             throw;
sl@0:         }
sl@0: 
sl@0: #else
sl@0: 
sl@0:         pi_ = new sp_counted_impl_p<Y>( p );
sl@0: 
sl@0:         if( pi_ == 0 )
sl@0:         {
sl@0:             boost::checked_delete( p );
sl@0:             boost::throw_exception( std::bad_alloc() );
sl@0:         }
sl@0: 
sl@0: #endif
sl@0:     }
sl@0: 
sl@0:     template<class P, class D> shared_count(P p, D d): pi_(0)
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0:     {
sl@0: #ifndef BOOST_NO_EXCEPTIONS
sl@0: 
sl@0:         try
sl@0:         {
sl@0:             pi_ = new sp_counted_impl_pd<P, D>(p, d);
sl@0:         }
sl@0:         catch(...)
sl@0:         {
sl@0:             d(p); // delete p
sl@0:             throw;
sl@0:         }
sl@0: 
sl@0: #else
sl@0: 
sl@0:         pi_ = new sp_counted_impl_pd<P, D>(p, d);
sl@0: 
sl@0:         if(pi_ == 0)
sl@0:         {
sl@0:             d(p); // delete p
sl@0:             boost::throw_exception(std::bad_alloc());
sl@0:         }
sl@0: 
sl@0: #endif
sl@0:     }
sl@0: 
sl@0:     template<class P, class D, class A> shared_count( P p, D d, A a ): pi_( 0 )
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0:     {
sl@0:         typedef sp_counted_impl_pda<P, D, A> impl_type;
sl@0:         typedef typename A::template rebind< impl_type >::other A2;
sl@0: 
sl@0:         A2 a2( a );
sl@0: 
sl@0: #ifndef BOOST_NO_EXCEPTIONS
sl@0: 
sl@0:         try
sl@0:         {
sl@0:             pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) );
sl@0:             new( static_cast< void* >( pi_ ) ) impl_type( p, d, a );
sl@0:         }
sl@0:         catch(...)
sl@0:         {
sl@0:             d( p );
sl@0: 
sl@0:             if( pi_ != 0 )
sl@0:             {
sl@0:                 a2.deallocate( static_cast< impl_type* >( pi_ ), 1 );
sl@0:             }
sl@0: 
sl@0:             throw;
sl@0:         }
sl@0: 
sl@0: #else
sl@0: 
sl@0:         pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) );
sl@0: 
sl@0:         if( pi_ != 0 )
sl@0:         {
sl@0:             new( static_cast< void* >( pi_ ) ) impl_type( p, d, a );
sl@0:         }
sl@0:         else
sl@0:         {
sl@0:             d( p );
sl@0:             boost::throw_exception( std::bad_alloc() );
sl@0:         }
sl@0: 
sl@0: #endif
sl@0:     }
sl@0: 
sl@0: #ifndef BOOST_NO_AUTO_PTR
sl@0: 
sl@0:     // auto_ptr<Y> is special cased to provide the strong guarantee
sl@0: 
sl@0:     template<class Y>
sl@0:     explicit shared_count( std::auto_ptr<Y> & r ): pi_( new sp_counted_impl_p<Y>( r.get() ) )
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0:     {
sl@0: #ifdef BOOST_NO_EXCEPTIONS
sl@0: 
sl@0:         if( pi_ == 0 )
sl@0:         {
sl@0:             boost::throw_exception(std::bad_alloc());
sl@0:         }
sl@0: 
sl@0: #endif
sl@0: 
sl@0:         r.release();
sl@0:     }
sl@0: 
sl@0: #endif 
sl@0: 
sl@0:     ~shared_count() // nothrow
sl@0:     {
sl@0:         if( pi_ != 0 ) pi_->release();
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         id_ = 0;
sl@0: #endif
sl@0:     }
sl@0: 
sl@0:     shared_count(shared_count const & r): pi_(r.pi_) // nothrow
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0:     {
sl@0:         if( pi_ != 0 ) pi_->add_ref_copy();
sl@0:     }
sl@0: 
sl@0:     explicit shared_count(weak_count const & r); // throws bad_weak_ptr when r.use_count() == 0
sl@0: 
sl@0:     shared_count & operator= (shared_count const & r) // nothrow
sl@0:     {
sl@0:         sp_counted_base * tmp = r.pi_;
sl@0: 
sl@0:         if( tmp != pi_ )
sl@0:         {
sl@0:             if( tmp != 0 ) tmp->add_ref_copy();
sl@0:             if( pi_ != 0 ) pi_->release();
sl@0:             pi_ = tmp;
sl@0:         }
sl@0: 
sl@0:         return *this;
sl@0:     }
sl@0: 
sl@0:     void swap(shared_count & r) // nothrow
sl@0:     {
sl@0:         sp_counted_base * tmp = r.pi_;
sl@0:         r.pi_ = pi_;
sl@0:         pi_ = tmp;
sl@0:     }
sl@0: 
sl@0:     long use_count() const // nothrow
sl@0:     {
sl@0:         return pi_ != 0? pi_->use_count(): 0;
sl@0:     }
sl@0: 
sl@0:     bool unique() const // nothrow
sl@0:     {
sl@0:         return use_count() == 1;
sl@0:     }
sl@0: 
sl@0:     friend inline bool operator==(shared_count const & a, shared_count const & b)
sl@0:     {
sl@0:         return a.pi_ == b.pi_;
sl@0:     }
sl@0: 
sl@0:     friend inline bool operator<(shared_count const & a, shared_count const & b)
sl@0:     {
sl@0:         return std::less<sp_counted_base *>()( a.pi_, b.pi_ );
sl@0:     }
sl@0: 
sl@0:     void * get_deleter(std::type_info const & ti) const
sl@0:     {
sl@0:         return pi_? pi_->get_deleter( ti ): 0;
sl@0:     }
sl@0: };
sl@0: 
sl@0: 
sl@0: class weak_count
sl@0: {
sl@0: private:
sl@0: 
sl@0:     sp_counted_base * pi_;
sl@0: 
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:     int id_;
sl@0: #endif
sl@0: 
sl@0:     friend class shared_count;
sl@0: 
sl@0: public:
sl@0: 
sl@0:     weak_count(): pi_(0) // nothrow
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(weak_count_id)
sl@0: #endif
sl@0:     {
sl@0:     }
sl@0: 
sl@0:     weak_count(shared_count const & r): pi_(r.pi_) // nothrow
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0:     {
sl@0:         if(pi_ != 0) pi_->weak_add_ref();
sl@0:     }
sl@0: 
sl@0:     weak_count(weak_count const & r): pi_(r.pi_) // nothrow
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0:     {
sl@0:         if(pi_ != 0) pi_->weak_add_ref();
sl@0:     }
sl@0: 
sl@0:     ~weak_count() // nothrow
sl@0:     {
sl@0:         if(pi_ != 0) pi_->weak_release();
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         id_ = 0;
sl@0: #endif
sl@0:     }
sl@0: 
sl@0:     weak_count & operator= (shared_count const & r) // nothrow
sl@0:     {
sl@0:         sp_counted_base * tmp = r.pi_;
sl@0:         if(tmp != 0) tmp->weak_add_ref();
sl@0:         if(pi_ != 0) pi_->weak_release();
sl@0:         pi_ = tmp;
sl@0: 
sl@0:         return *this;
sl@0:     }
sl@0: 
sl@0:     weak_count & operator= (weak_count const & r) // nothrow
sl@0:     {
sl@0:         sp_counted_base * tmp = r.pi_;
sl@0:         if(tmp != 0) tmp->weak_add_ref();
sl@0:         if(pi_ != 0) pi_->weak_release();
sl@0:         pi_ = tmp;
sl@0: 
sl@0:         return *this;
sl@0:     }
sl@0: 
sl@0:     void swap(weak_count & r) // nothrow
sl@0:     {
sl@0:         sp_counted_base * tmp = r.pi_;
sl@0:         r.pi_ = pi_;
sl@0:         pi_ = tmp;
sl@0:     }
sl@0: 
sl@0:     long use_count() const // nothrow
sl@0:     {
sl@0:         return pi_ != 0? pi_->use_count(): 0;
sl@0:     }
sl@0: 
sl@0:     friend inline bool operator==(weak_count const & a, weak_count const & b)
sl@0:     {
sl@0:         return a.pi_ == b.pi_;
sl@0:     }
sl@0: 
sl@0:     friend inline bool operator<(weak_count const & a, weak_count const & b)
sl@0:     {
sl@0:         return std::less<sp_counted_base *>()(a.pi_, b.pi_);
sl@0:     }
sl@0: };
sl@0: 
sl@0: inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ )
sl@0: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
sl@0:         , id_(shared_count_id)
sl@0: #endif
sl@0: {
sl@0:     if( pi_ == 0 || !pi_->add_ref_lock() )
sl@0:     {
sl@0:         boost::throw_exception( boost::bad_weak_ptr() );
sl@0:     }
sl@0: }
sl@0: 
sl@0: } // namespace detail
sl@0: 
sl@0: } // namespace boost
sl@0: 
sl@0: #ifdef __BORLANDC__
sl@0: # pragma warn .8027     // Functions containing try are not expanded inline
sl@0: #endif
sl@0: 
sl@0: #endif  // #ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED