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