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49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
#ifndef MY_COUNTER_H_INCLUDED
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#define MY_COUNTER_H_INCLUDED
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/*
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Copyright (C) 2018 MariaDB Foundation
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <atomic>
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template <typename Type> class Atomic_counter
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{
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std::atomic<Type> m_counter;
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Type add(Type i) { return m_counter.fetch_add(i, std::memory_order_relaxed); }
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Type sub(Type i) { return m_counter.fetch_sub(i, std::memory_order_relaxed); }
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public:
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Atomic_counter(const Atomic_counter<Type> &rhs)
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{ m_counter.store(rhs, std::memory_order_relaxed); }
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Atomic_counter(Type val): m_counter(val) {}
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Atomic_counter() {}
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Type operator++(int) { return add(1); }
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Type operator--(int) { return sub(1); }
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Type operator++() { return add(1) + 1; }
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Type operator--() { return sub(1) - 1; }
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Type operator+=(const Type i) { return add(i) + i; }
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Type operator-=(const Type i) { return sub(i) - i; }
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operator Type() const { return m_counter.load(std::memory_order_relaxed); }
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Type operator=(const Type val)
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{ m_counter.store(val, std::memory_order_relaxed); return val; }
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};
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#endif /* MY_COUNTER_H_INCLUDED */
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