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708 lines
15 KiB
708 lines
15 KiB
#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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#if defined(__BORLANDC__) && !defined(__clang__)
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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/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/smart_ptr/detail/sp_disable_deprecated.hpp>
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#include <boost/smart_ptr/detail/sp_noexcept.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/core/addressof.hpp>
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#include <boost/config.hpp>
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#include <boost/config/workaround.hpp>
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#include <boost/cstdint.hpp>
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#include <memory> // std::auto_ptr
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#include <functional> // std::less
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#include <cstddef> // std::size_t
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#ifdef BOOST_NO_EXCEPTIONS
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# include <new> // std::bad_alloc
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#endif
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#if defined( BOOST_SP_DISABLE_DEPRECATED )
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#endif
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namespace boost
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{
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namespace movelib
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{
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template< class T, class D > class unique_ptr;
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} // namespace movelib
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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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template< class T > class sp_reference_wrapper
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{
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public:
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explicit sp_reference_wrapper( T & t): t_( boost::addressof( t ) )
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{
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}
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template< class Y > void operator()( Y * p ) const
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{
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(*t_)( p );
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}
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private:
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T * t_;
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};
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template< class D > struct sp_convert_reference
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{
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typedef D type;
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};
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template< class D > struct sp_convert_reference< D& >
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{
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typedef sp_reference_wrapper< D > type;
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};
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template<class T> std::size_t sp_hash_pointer( T* p ) BOOST_NOEXCEPT
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{
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boost::uintptr_t v = reinterpret_cast<boost::uintptr_t>( p );
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// match boost::hash<T*>
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return static_cast<std::size_t>( v + ( v >> 3 ) );
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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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BOOST_CONSTEXPR shared_count() BOOST_SP_NOEXCEPT: 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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}
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BOOST_CONSTEXPR explicit shared_count( sp_counted_base * pi ) BOOST_SP_NOEXCEPT: pi_( 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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}
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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::operator_fn( 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::operator_fn( 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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#if !defined( BOOST_NO_CXX11_ALLOCATOR )
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typedef typename std::allocator_traits<A>::template rebind_alloc< impl_type > A2;
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#else
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typedef typename A::template rebind< impl_type >::other A2;
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#endif
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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 );
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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 );
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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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#if !defined( BOOST_NO_CXX11_ALLOCATOR )
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typedef typename std::allocator_traits<A>::template rebind_alloc< impl_type > A2;
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#else
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typedef typename A::template rebind< impl_type >::other A2;
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#endif
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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 );
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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::operator_fn( 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 );
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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::operator_fn( 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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#if !defined( BOOST_NO_CXX11_SMART_PTR )
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template<class Y, class D>
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explicit shared_count( std::unique_ptr<Y, D> & r ): 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 typename sp_convert_reference<D>::type D2;
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D2 d2( r.get_deleter() );
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pi_ = new sp_counted_impl_pd< typename std::unique_ptr<Y, D>::pointer, D2 >( r.get(), d2 );
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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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template<class Y, class D>
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explicit shared_count( boost::movelib::unique_ptr<Y, D> & r ): 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 typename sp_convert_reference<D>::type D2;
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D2 d2( r.get_deleter() );
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pi_ = new sp_counted_impl_pd< typename boost::movelib::unique_ptr<Y, D>::pointer, D2 >( r.get(), d2 );
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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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~shared_count() /*BOOST_SP_NOEXCEPT*/
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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) BOOST_SP_NOEXCEPT: 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_copy();
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}
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#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
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shared_count(shared_count && r) BOOST_SP_NOEXCEPT: 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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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 ) BOOST_SP_NOEXCEPT; // constructs an empty *this when r.use_count() == 0
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shared_count & operator= (shared_count const & r) BOOST_SP_NOEXCEPT
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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) BOOST_SP_NOEXCEPT
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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 BOOST_SP_NOEXCEPT
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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 BOOST_SP_NOEXCEPT
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{
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return use_count() == 1;
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}
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bool empty() const BOOST_SP_NOEXCEPT
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{
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return pi_ == 0;
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}
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bool operator==( shared_count const & r ) const BOOST_SP_NOEXCEPT
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{
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return pi_ == r.pi_;
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}
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bool operator==( weak_count const & r ) const BOOST_SP_NOEXCEPT;
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bool operator<( shared_count const & r ) const BOOST_SP_NOEXCEPT
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{
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return std::less<sp_counted_base *>()( pi_, r.pi_ );
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}
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bool operator<( weak_count const & r ) const BOOST_SP_NOEXCEPT;
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void * get_deleter( sp_typeinfo_ const & ti ) const BOOST_SP_NOEXCEPT
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{
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return pi_? pi_->get_deleter( ti ): 0;
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}
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void * get_local_deleter( sp_typeinfo_ const & ti ) const BOOST_SP_NOEXCEPT
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{
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return pi_? pi_->get_local_deleter( ti ): 0;
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}
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void * get_untyped_deleter() const BOOST_SP_NOEXCEPT
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{
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return pi_? pi_->get_untyped_deleter(): 0;
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}
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std::size_t hash_value() const BOOST_SP_NOEXCEPT
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{
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return sp_hash_pointer( pi_ );
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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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BOOST_CONSTEXPR weak_count() BOOST_SP_NOEXCEPT: pi_(0)
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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) BOOST_SP_NOEXCEPT: pi_(r.pi_)
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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) BOOST_SP_NOEXCEPT: pi_(r.pi_)
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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_NO_CXX11_RVALUE_REFERENCES )
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weak_count(weak_count && r) BOOST_SP_NOEXCEPT: pi_(r.pi_)
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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() /*BOOST_SP_NOEXCEPT*/
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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) BOOST_SP_NOEXCEPT
|
|
{
|
|
sp_counted_base * tmp = r.pi_;
|
|
|
|
if( tmp != pi_ )
|
|
{
|
|
if(tmp != 0) tmp->weak_add_ref();
|
|
if(pi_ != 0) pi_->weak_release();
|
|
pi_ = tmp;
|
|
}
|
|
|
|
return *this;
|
|
}
|
|
|
|
weak_count & operator= (weak_count const & r) BOOST_SP_NOEXCEPT
|
|
{
|
|
sp_counted_base * tmp = r.pi_;
|
|
|
|
if( tmp != pi_ )
|
|
{
|
|
if(tmp != 0) tmp->weak_add_ref();
|
|
if(pi_ != 0) pi_->weak_release();
|
|
pi_ = tmp;
|
|
}
|
|
|
|
return *this;
|
|
}
|
|
|
|
void swap(weak_count & r) BOOST_SP_NOEXCEPT
|
|
{
|
|
sp_counted_base * tmp = r.pi_;
|
|
r.pi_ = pi_;
|
|
pi_ = tmp;
|
|
}
|
|
|
|
long use_count() const BOOST_SP_NOEXCEPT
|
|
{
|
|
return pi_ != 0? pi_->use_count(): 0;
|
|
}
|
|
|
|
bool empty() const BOOST_SP_NOEXCEPT
|
|
{
|
|
return pi_ == 0;
|
|
}
|
|
|
|
bool operator==( weak_count const & r ) const BOOST_SP_NOEXCEPT
|
|
{
|
|
return pi_ == r.pi_;
|
|
}
|
|
|
|
bool operator==( shared_count const & r ) const BOOST_SP_NOEXCEPT
|
|
{
|
|
return pi_ == r.pi_;
|
|
}
|
|
|
|
bool operator<( weak_count const & r ) const BOOST_SP_NOEXCEPT
|
|
{
|
|
return std::less<sp_counted_base *>()( pi_, r.pi_ );
|
|
}
|
|
|
|
bool operator<( shared_count const & r ) const BOOST_SP_NOEXCEPT
|
|
{
|
|
return std::less<sp_counted_base *>()( pi_, r.pi_ );
|
|
}
|
|
|
|
std::size_t hash_value() const BOOST_SP_NOEXCEPT
|
|
{
|
|
return sp_hash_pointer( pi_ );
|
|
}
|
|
};
|
|
|
|
inline shared_count::shared_count( weak_count const & r ): pi_( r.pi_ )
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
, id_(shared_count_id)
|
|
#endif
|
|
{
|
|
if( pi_ == 0 || !pi_->add_ref_lock() )
|
|
{
|
|
boost::throw_exception( boost::bad_weak_ptr() );
|
|
}
|
|
}
|
|
|
|
inline shared_count::shared_count( weak_count const & r, sp_nothrow_tag ) BOOST_SP_NOEXCEPT: pi_( r.pi_ )
|
|
#if defined(BOOST_SP_ENABLE_DEBUG_HOOKS)
|
|
, id_(shared_count_id)
|
|
#endif
|
|
{
|
|
if( pi_ != 0 && !pi_->add_ref_lock() )
|
|
{
|
|
pi_ = 0;
|
|
}
|
|
}
|
|
|
|
inline bool shared_count::operator==( weak_count const & r ) const BOOST_SP_NOEXCEPT
|
|
{
|
|
return pi_ == r.pi_;
|
|
}
|
|
|
|
inline bool shared_count::operator<( weak_count const & r ) const BOOST_SP_NOEXCEPT
|
|
{
|
|
return std::less<sp_counted_base *>()( pi_, r.pi_ );
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
} // namespace boost
|
|
|
|
#if defined( BOOST_SP_DISABLE_DEPRECATED )
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
|
|
#if defined(__BORLANDC__) && !defined(__clang__)
|
|
# pragma warn .8027 // Functions containing try are not expanded inline
|
|
#endif
|
|
|
|
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SHARED_COUNT_HPP_INCLUDED
|