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149 lines
3.1 KiB
C++
149 lines
3.1 KiB
C++
#ifndef BOOST_SMART_PTR_DETAIL_LOCAL_COUNTED_BASE_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_LOCAL_COUNTED_BASE_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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// detail/local_counted_base.hpp
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//
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// Copyright 2017 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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// See http://www.boost.org/libs/smart_ptr/ for documentation.
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#include <boost/smart_ptr/detail/shared_count.hpp>
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#include <boost/config.hpp>
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#include <utility>
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namespace boost
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{
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namespace detail
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{
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class BOOST_SYMBOL_VISIBLE local_counted_base
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{
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private:
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local_counted_base & operator= ( local_counted_base const & );
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private:
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// not 'int' or 'unsigned' to avoid aliasing and enable optimizations
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enum count_type { min_ = 0, initial_ = 1, max_ = 2147483647 };
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count_type local_use_count_;
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public:
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BOOST_CONSTEXPR local_counted_base() BOOST_SP_NOEXCEPT: local_use_count_( initial_ )
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{
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}
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BOOST_CONSTEXPR local_counted_base( local_counted_base const & ) BOOST_SP_NOEXCEPT: local_use_count_( initial_ )
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{
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}
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virtual ~local_counted_base() /*BOOST_SP_NOEXCEPT*/
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{
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}
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virtual void local_cb_destroy() BOOST_SP_NOEXCEPT = 0;
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virtual boost::detail::shared_count local_cb_get_shared_count() const BOOST_SP_NOEXCEPT = 0;
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void add_ref() BOOST_SP_NOEXCEPT
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{
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#if !defined(__NVCC__)
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#if defined( __has_builtin )
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# if __has_builtin( __builtin_assume )
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__builtin_assume( local_use_count_ >= 1 );
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# endif
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#endif
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#endif
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local_use_count_ = static_cast<count_type>( local_use_count_ + 1 );
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}
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void release() BOOST_SP_NOEXCEPT
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{
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local_use_count_ = static_cast<count_type>( local_use_count_ - 1 );
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if( local_use_count_ == 0 )
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{
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local_cb_destroy();
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}
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}
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long local_use_count() const BOOST_SP_NOEXCEPT
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{
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return local_use_count_;
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}
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};
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class BOOST_SYMBOL_VISIBLE local_counted_impl: public local_counted_base
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{
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private:
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local_counted_impl( local_counted_impl const & );
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private:
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shared_count pn_;
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public:
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explicit local_counted_impl( shared_count const& pn ) BOOST_SP_NOEXCEPT: pn_( pn )
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{
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}
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#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
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explicit local_counted_impl( shared_count && pn ) BOOST_SP_NOEXCEPT: pn_( std::move(pn) )
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{
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}
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#endif
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virtual void local_cb_destroy() BOOST_SP_NOEXCEPT
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{
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delete this;
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}
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virtual boost::detail::shared_count local_cb_get_shared_count() const BOOST_SP_NOEXCEPT
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{
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return pn_;
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}
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};
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class BOOST_SYMBOL_VISIBLE local_counted_impl_em: public local_counted_base
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{
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public:
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shared_count pn_;
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virtual void local_cb_destroy() BOOST_SP_NOEXCEPT
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{
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shared_count().swap( pn_ );
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}
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virtual boost::detail::shared_count local_cb_get_shared_count() const BOOST_SP_NOEXCEPT
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{
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return pn_;
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}
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};
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} // namespace detail
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} // namespace boost
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_LOCAL_COUNTED_BASE_HPP_INCLUDED
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