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68 lines
1.3 KiB
C++
68 lines
1.3 KiB
C++
2 years ago
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#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED
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//
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// boost/detail/atomic_count_std_atomic.hpp
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//
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// atomic_count for std::atomic
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//
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// Copyright 2013 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0.
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// See 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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#include <atomic>
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#include <cstdint>
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#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
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#include <boost/config/pragma_message.hpp>
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BOOST_PRAGMA_MESSAGE("Using std::atomic atomic_count")
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#endif
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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 atomic_count
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{
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public:
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explicit atomic_count( long v ): value_( static_cast< std::int_least32_t >( v ) )
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{
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}
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long operator++()
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{
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return value_.fetch_add( 1, std::memory_order_acq_rel ) + 1;
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}
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long operator--()
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{
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return value_.fetch_sub( 1, std::memory_order_acq_rel ) - 1;
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}
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operator long() const
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{
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return value_.load( std::memory_order_acquire );
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}
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private:
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atomic_count(atomic_count const &);
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atomic_count & operator=(atomic_count const &);
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std::atomic_int_least32_t value_;
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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_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED
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