williamr@2: #ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED
williamr@2: #define BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED
williamr@2: 
williamr@2: // MS compatible compilers support #pragma once
williamr@2: 
williamr@2: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
williamr@2: # pragma once
williamr@2: #endif
williamr@2: 
williamr@2: //
williamr@2: //  detail/shared_count.hpp
williamr@2: //
williamr@2: //  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
williamr@2: //  Copyright 2004-2005 Peter Dimov
williamr@2: //
williamr@2: // Distributed under the Boost Software License, Version 1.0. (See
williamr@2: // accompanying file LICENSE_1_0.txt or copy at
williamr@2: // http://www.boost.org/LICENSE_1_0.txt)
williamr@2: //
williamr@2: 
williamr@2: #ifdef __BORLANDC__
williamr@2: # pragma warn -8027     // Functions containing try are not expanded inline
williamr@2: #endif
williamr@2: 
williamr@2: #include <boost/config.hpp>
williamr@2: #include <boost/checked_delete.hpp>
williamr@2: #include <boost/throw_exception.hpp>
williamr@2: #include <boost/detail/bad_weak_ptr.hpp>
williamr@2: #include <boost/detail/sp_counted_base.hpp>
williamr@2: #include <boost/detail/sp_counted_impl.hpp>
williamr@2: 
williamr@2: #include <memory>           // std::auto_ptr
williamr@2: #include <functional>       // std::less
williamr@2: #include <new>              // std::bad_alloc
williamr@2: #include <typeinfo>         // std::type_info in get_deleter
williamr@2: 
williamr@2: namespace boost
williamr@2: {
williamr@2: 
williamr@2: namespace detail
williamr@2: {
williamr@2: 
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2: 
williamr@2: int const shared_count_id = 0x2C35F101;
williamr@2: int const   weak_count_id = 0x298C38A4;
williamr@2: 
williamr@2: #endif
williamr@2: 
williamr@2: class weak_count;
williamr@2: 
williamr@2: class shared_count
williamr@2: {
williamr@2: private:
williamr@2: 
williamr@2:     sp_counted_base * pi_;
williamr@2: 
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:     int id_;
williamr@2: #endif
williamr@2: 
williamr@2:     friend class weak_count;
williamr@2: 
williamr@2: public:
williamr@2: 
williamr@2:     shared_count(): pi_(0) // nothrow
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2:     }
williamr@2: 
williamr@2:     template<class Y> explicit shared_count( Y * p ): pi_( 0 )
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2: #ifndef BOOST_NO_EXCEPTIONS
williamr@2: 
williamr@2:         try
williamr@2:         {
williamr@2:             pi_ = new sp_counted_impl_p<Y>( p );
williamr@2:         }
williamr@2:         catch(...)
williamr@2:         {
williamr@2:             boost::checked_delete( p );
williamr@2:             throw;
williamr@2:         }
williamr@2: 
williamr@2: #else
williamr@2: 
williamr@2:         pi_ = new sp_counted_impl_p<Y>( p );
williamr@2: 
williamr@2:         if( pi_ == 0 )
williamr@2:         {
williamr@2:             boost::checked_delete( p );
williamr@2:             boost::throw_exception( std::bad_alloc() );
williamr@2:         }
williamr@2: 
williamr@2: #endif
williamr@2:     }
williamr@2: 
williamr@2:     template<class P, class D> shared_count(P p, D d): pi_(0)
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2: #ifndef BOOST_NO_EXCEPTIONS
williamr@2: 
williamr@2:         try
williamr@2:         {
williamr@2:             pi_ = new sp_counted_impl_pd<P, D>(p, d);
williamr@2:         }
williamr@2:         catch(...)
williamr@2:         {
williamr@2:             d(p); // delete p
williamr@2:             throw;
williamr@2:         }
williamr@2: 
williamr@2: #else
williamr@2: 
williamr@2:         pi_ = new sp_counted_impl_pd<P, D>(p, d);
williamr@2: 
williamr@2:         if(pi_ == 0)
williamr@2:         {
williamr@2:             d(p); // delete p
williamr@2:             boost::throw_exception(std::bad_alloc());
williamr@2:         }
williamr@2: 
williamr@2: #endif
williamr@2:     }
williamr@2: 
williamr@2:     template<class P, class D, class A> shared_count( P p, D d, A a ): pi_( 0 )
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2:         typedef sp_counted_impl_pda<P, D, A> impl_type;
williamr@2:         typedef typename A::template rebind< impl_type >::other A2;
williamr@2: 
williamr@2:         A2 a2( a );
williamr@2: 
williamr@2: #ifndef BOOST_NO_EXCEPTIONS
williamr@2: 
williamr@2:         try
williamr@2:         {
williamr@2:             pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) );
williamr@2:             new( static_cast< void* >( pi_ ) ) impl_type( p, d, a );
williamr@2:         }
williamr@2:         catch(...)
williamr@2:         {
williamr@2:             d( p );
williamr@2: 
williamr@2:             if( pi_ != 0 )
williamr@2:             {
williamr@2:                 a2.deallocate( static_cast< impl_type* >( pi_ ), 1 );
williamr@2:             }
williamr@2: 
williamr@2:             throw;
williamr@2:         }
williamr@2: 
williamr@2: #else
williamr@2: 
williamr@2:         pi_ = a2.allocate( 1, static_cast< impl_type* >( 0 ) );
williamr@2: 
williamr@2:         if( pi_ != 0 )
williamr@2:         {
williamr@2:             new( static_cast< void* >( pi_ ) ) impl_type( p, d, a );
williamr@2:         }
williamr@2:         else
williamr@2:         {
williamr@2:             d( p );
williamr@2:             boost::throw_exception( std::bad_alloc() );
williamr@2:         }
williamr@2: 
williamr@2: #endif
williamr@2:     }
williamr@2: 
williamr@2: #ifndef BOOST_NO_AUTO_PTR
williamr@2: 
williamr@2:     // auto_ptr<Y> is special cased to provide the strong guarantee
williamr@2: 
williamr@2:     template<class Y>
williamr@2:     explicit shared_count( std::auto_ptr<Y> & r ): pi_( new sp_counted_impl_p<Y>( r.get() ) )
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2: #ifdef BOOST_NO_EXCEPTIONS
williamr@2: 
williamr@2:         if( pi_ == 0 )
williamr@2:         {
williamr@2:             boost::throw_exception(std::bad_alloc());
williamr@2:         }
williamr@2: 
williamr@2: #endif
williamr@2: 
williamr@2:         r.release();
williamr@2:     }
williamr@2: 
williamr@2: #endif 
williamr@2: 
williamr@2:     ~shared_count() // nothrow
williamr@2:     {
williamr@2:         if( pi_ != 0 ) pi_->release();
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         id_ = 0;
williamr@2: #endif
williamr@2:     }
williamr@2: 
williamr@2:     shared_count(shared_count const & r): pi_(r.pi_) // nothrow
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2:         if( pi_ != 0 ) pi_->add_ref_copy();
williamr@2:     }
williamr@2: 
williamr@2:     explicit shared_count(weak_count const & r); // throws bad_weak_ptr when r.use_count() == 0
williamr@2: 
williamr@2:     shared_count & operator= (shared_count const & r) // nothrow
williamr@2:     {
williamr@2:         sp_counted_base * tmp = r.pi_;
williamr@2: 
williamr@2:         if( tmp != pi_ )
williamr@2:         {
williamr@2:             if( tmp != 0 ) tmp->add_ref_copy();
williamr@2:             if( pi_ != 0 ) pi_->release();
williamr@2:             pi_ = tmp;
williamr@2:         }
williamr@2: 
williamr@2:         return *this;
williamr@2:     }
williamr@2: 
williamr@2:     void swap(shared_count & r) // nothrow
williamr@2:     {
williamr@2:         sp_counted_base * tmp = r.pi_;
williamr@2:         r.pi_ = pi_;
williamr@2:         pi_ = tmp;
williamr@2:     }
williamr@2: 
williamr@2:     long use_count() const // nothrow
williamr@2:     {
williamr@2:         return pi_ != 0? pi_->use_count(): 0;
williamr@2:     }
williamr@2: 
williamr@2:     bool unique() const // nothrow
williamr@2:     {
williamr@2:         return use_count() == 1;
williamr@2:     }
williamr@2: 
williamr@2:     friend inline bool operator==(shared_count const & a, shared_count const & b)
williamr@2:     {
williamr@2:         return a.pi_ == b.pi_;
williamr@2:     }
williamr@2: 
williamr@2:     friend inline bool operator<(shared_count const & a, shared_count const & b)
williamr@2:     {
williamr@2:         return std::less<sp_counted_base *>()( a.pi_, b.pi_ );
williamr@2:     }
williamr@2: 
williamr@2:     void * get_deleter(std::type_info const & ti) const
williamr@2:     {
williamr@2:         return pi_? pi_->get_deleter( ti ): 0;
williamr@2:     }
williamr@2: };
williamr@2: 
williamr@2: 
williamr@2: class weak_count
williamr@2: {
williamr@2: private:
williamr@2: 
williamr@2:     sp_counted_base * pi_;
williamr@2: 
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:     int id_;
williamr@2: #endif
williamr@2: 
williamr@2:     friend class shared_count;
williamr@2: 
williamr@2: public:
williamr@2: 
williamr@2:     weak_count(): pi_(0) // nothrow
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(weak_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2:     }
williamr@2: 
williamr@2:     weak_count(shared_count const & r): pi_(r.pi_) // nothrow
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2:         if(pi_ != 0) pi_->weak_add_ref();
williamr@2:     }
williamr@2: 
williamr@2:     weak_count(weak_count const & r): pi_(r.pi_) // nothrow
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2:     {
williamr@2:         if(pi_ != 0) pi_->weak_add_ref();
williamr@2:     }
williamr@2: 
williamr@2:     ~weak_count() // nothrow
williamr@2:     {
williamr@2:         if(pi_ != 0) pi_->weak_release();
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         id_ = 0;
williamr@2: #endif
williamr@2:     }
williamr@2: 
williamr@2:     weak_count & operator= (shared_count const & r) // nothrow
williamr@2:     {
williamr@2:         sp_counted_base * tmp = r.pi_;
williamr@2:         if(tmp != 0) tmp->weak_add_ref();
williamr@2:         if(pi_ != 0) pi_->weak_release();
williamr@2:         pi_ = tmp;
williamr@2: 
williamr@2:         return *this;
williamr@2:     }
williamr@2: 
williamr@2:     weak_count & operator= (weak_count const & r) // nothrow
williamr@2:     {
williamr@2:         sp_counted_base * tmp = r.pi_;
williamr@2:         if(tmp != 0) tmp->weak_add_ref();
williamr@2:         if(pi_ != 0) pi_->weak_release();
williamr@2:         pi_ = tmp;
williamr@2: 
williamr@2:         return *this;
williamr@2:     }
williamr@2: 
williamr@2:     void swap(weak_count & r) // nothrow
williamr@2:     {
williamr@2:         sp_counted_base * tmp = r.pi_;
williamr@2:         r.pi_ = pi_;
williamr@2:         pi_ = tmp;
williamr@2:     }
williamr@2: 
williamr@2:     long use_count() const // nothrow
williamr@2:     {
williamr@2:         return pi_ != 0? pi_->use_count(): 0;
williamr@2:     }
williamr@2: 
williamr@2:     friend inline bool operator==(weak_count const & a, weak_count const & b)
williamr@2:     {
williamr@2:         return a.pi_ == b.pi_;
williamr@2:     }
williamr@2: 
williamr@2:     friend inline bool operator<(weak_count const & a, weak_count const & b)
williamr@2:     {
williamr@2:         return std::less<sp_counted_base *>()(a.pi_, b.pi_);
williamr@2:     }
williamr@2: };
williamr@2: 
williamr@2: inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ )
williamr@2: #if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
williamr@2:         , id_(shared_count_id)
williamr@2: #endif
williamr@2: {
williamr@2:     if( pi_ == 0 || !pi_->add_ref_lock() )
williamr@2:     {
williamr@2:         boost::throw_exception( boost::bad_weak_ptr() );
williamr@2:     }
williamr@2: }
williamr@2: 
williamr@2: } // namespace detail
williamr@2: 
williamr@2: } // namespace boost
williamr@2: 
williamr@2: #ifdef __BORLANDC__
williamr@2: # pragma warn .8027     // Functions containing try are not expanded inline
williamr@2: #endif
williamr@2: 
williamr@2: #endif  // #ifndef BOOST_DETAIL_SHARED_COUNT_HPP_INCLUDED