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#ifndef _posix_AtomicCount_h
#define _posix_AtomicCount_h
/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <boost/detail/atomic_count.hpp>
#include <boost/noncopyable.hpp>
namespace qpid {
namespace sys {
/**
* Atomic counter.
*/
class AtomicCount : boost::noncopyable {
public:
class ScopedDecrement : boost::noncopyable {
public:
/** Decrement counter in constructor and increment in destructor. */
ScopedDecrement(AtomicCount& c) : count(c) { value = --count; }
~ScopedDecrement() { ++count; }
/** Return the value returned by the decrement. */
operator long() { return value; }
private:
AtomicCount& count;
long value;
};
class ScopedIncrement : boost::noncopyable {
public:
/** Increment counter in constructor and increment in destructor. */
ScopedIncrement(AtomicCount& c) : count(c) { ++count; }
~ScopedIncrement() { --count; }
private:
AtomicCount& count;
};
AtomicCount(long value = 0) : count(value) {}
void operator++() { ++count ; }
long operator--() { return --count; }
operator long() const { return count; }
private:
boost::detail::atomic_count count;
};
}}
#endif // _posix_AtomicCount_h
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