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64 lines
1.2 KiB
64 lines
1.2 KiB
3 years ago
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#ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_ATOMIC_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_ATOMIC_HPP_INCLUDED
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// boost/detail/atomic_count_gcc_atomic.hpp
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//
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// atomic_count for g++ 4.7+
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//
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// Copyright 2007, 2020 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/cstdint.hpp>
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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 __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< boost::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 __atomic_add_fetch( &value_, +1, __ATOMIC_ACQ_REL );
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}
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long operator--()
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{
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return __atomic_add_fetch( &value_, -1, __ATOMIC_ACQ_REL );
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}
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operator long() const
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{
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return __atomic_load_n( &value_, __ATOMIC_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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boost::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_GCC_ATOMIC_HPP_INCLUDED
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