| 1 | #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED |
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| 2 | #define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED |
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| 3 | |
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| 4 | // |
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| 5 | // boost/detail/atomic_count_std_atomic.hpp |
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| 6 | // |
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| 7 | // atomic_count for std::atomic |
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| 8 | // |
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| 9 | // Copyright 2013 Peter Dimov |
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| 10 | // |
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| 11 | // Distributed under the Boost Software License, Version 1.0. |
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| 12 | // See accompanying file LICENSE_1_0.txt or copy at |
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| 13 | // http://www.boost.org/LICENSE_1_0.txt |
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| 14 | // |
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| 15 | |
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| 16 | #include <atomic> |
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| 17 | #include <cstdint> |
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| 18 | |
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| 19 | namespace boost |
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| 20 | { |
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| 21 | |
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| 22 | namespace detail |
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| 23 | { |
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| 24 | |
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| 25 | class atomic_count |
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| 26 | { |
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| 27 | public: |
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| 28 | |
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| 29 | explicit atomic_count( long v ): value_( v ) |
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| 30 | { |
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| 31 | } |
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| 32 | |
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| 33 | long operator++() |
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| 34 | { |
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| 35 | return value_.fetch_add( i: 1, m: std::memory_order_acq_rel ) + 1; |
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| 36 | } |
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| 37 | |
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| 38 | long operator--() |
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| 39 | { |
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| 40 | return value_.fetch_sub( i: 1, m: std::memory_order_acq_rel ) - 1; |
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| 41 | } |
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| 42 | |
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| 43 | operator long() const |
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| 44 | { |
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| 45 | return value_.load( m: std::memory_order_acquire ); |
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| 46 | } |
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| 47 | |
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| 48 | private: |
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| 49 | |
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| 50 | atomic_count(atomic_count const &); |
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| 51 | atomic_count & operator=(atomic_count const &); |
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| 52 | |
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| 53 | std::atomic_int_least32_t value_; |
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| 54 | }; |
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| 55 | |
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| 56 | } // namespace detail |
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| 57 | |
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| 58 | } // namespace boost |
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| 59 | |
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| 60 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_STD_ATOMIC_HPP_INCLUDED |
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| 61 | |
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