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// RefCountedObject.h
//
// $Id: //poco/1.3/Foundation/include/Poco/RefCountedObject.h#2 $
//
// Library: Foundation
// Package: Core
// Module: RefCountedObject
//
// Definition of the RefCountedObject class.
//
// Copyright (c) 2004-2009, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Foundation_RefCountedObject_INCLUDED
#define Foundation_RefCountedObject_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/AtomicCounter.h"
namespace Poco {
class Foundation_API RefCountedObject
/// A base class for objects that employ
/// reference counting based garbage collection.
///
/// Reference-counted objects inhibit construction
/// by copying and assignment.
{
public:
RefCountedObject();
/// Creates the RefCountedObject.
/// The initial reference count is one.
void duplicate() const;
/// Increments the object's reference count.
void release() const;
/// Decrements the object's reference count
/// and deletes the object if the count
/// reaches zero.
int referenceCount() const;
/// Returns the reference count.
protected:
virtual ~RefCountedObject();
/// Destroys the RefCountedObject.
private:
RefCountedObject(const RefCountedObject&);
RefCountedObject& operator = (const RefCountedObject&);
mutable AtomicCounter _counter;
};
//
// inlines
//
inline int RefCountedObject::referenceCount() const
{
return _counter.value();
}
inline void RefCountedObject::duplicate() const
{
++_counter;
}
inline void RefCountedObject::release() const
{
if (--_counter == 0) delete this;
}
} // namespace Poco
#endif // Foundation_RefCountedObject_INCLUDED
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