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https://github.com/VCMP-SqMod/SqMod.git
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4a6bfc086c
Switched to POCO library for unified platform/library interface. Deprecated the external module API. It was creating more problems than solving. Removed most built-in libraries in favor of system libraries for easier maintenance. Cleaned and secured code with help from static analyzers.
134 lines
2.7 KiB
C++
134 lines
2.7 KiB
C++
//
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// AtomicCounter.h
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//
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// Library: Foundation
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// Package: Core
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// Module: AtomicCounter
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//
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// Definition of the AtomicCounter class.
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//
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// Copyright (c) 2009, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_AtomicCounter_INCLUDED
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#define Foundation_AtomicCounter_INCLUDED
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#include "Poco/Foundation.h"
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#include <atomic>
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namespace Poco {
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class Foundation_API AtomicCounter
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/// This class implements a simple counter, which
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/// provides atomic operations that are safe to
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/// use in a multithreaded environment.
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///
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/// Typical usage of AtomicCounter is for implementing
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/// reference counting and similar functionality.
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{
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public:
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typedef int ValueType; /// The underlying integer type.
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AtomicCounter();
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/// Creates a new AtomicCounter and initializes it to zero.
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explicit AtomicCounter(ValueType initialValue);
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/// Creates a new AtomicCounter and initializes it with
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/// the given value.
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AtomicCounter(const AtomicCounter& counter);
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/// Creates the counter by copying another one.
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~AtomicCounter();
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/// Destroys the AtomicCounter.
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AtomicCounter& operator = (const AtomicCounter& counter);
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/// Assigns the value of another AtomicCounter.
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AtomicCounter& operator = (ValueType value);
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/// Assigns a value to the counter.
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operator ValueType () const;
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/// Converts the AtomicCounter to ValueType.
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ValueType value() const;
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/// Returns the value of the counter.
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ValueType operator ++ (); // prefix
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/// Increments the counter and returns the result.
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ValueType operator ++ (int); // postfix
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/// Increments the counter and returns the previous value.
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ValueType operator -- (); // prefix
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/// Decrements the counter and returns the result.
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ValueType operator -- (int); // postfix
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/// Decrements the counter and returns the previous value.
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bool operator ! () const;
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/// Returns true if the counter is zero, false otherwise.
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private:
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std::atomic<int> _counter;
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};
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//
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// inlines
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//
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inline AtomicCounter::operator AtomicCounter::ValueType () const
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{
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return _counter.load();
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}
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inline AtomicCounter::ValueType AtomicCounter::value() const
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{
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return _counter.load();
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}
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inline AtomicCounter::ValueType AtomicCounter::operator ++ () // prefix
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{
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return ++_counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator ++ (int) // postfix
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{
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return _counter++;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator -- () // prefix
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{
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return --_counter;
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}
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inline AtomicCounter::ValueType AtomicCounter::operator -- (int) // postfix
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{
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return _counter--;
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}
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inline bool AtomicCounter::operator ! () const
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{
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return _counter.load() == 0;
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}
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} // namespace Poco
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#endif // Foundation_AtomicCounter_INCLUDED
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