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110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
//
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// RefCountedObject.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/RefCountedObject.h#1 $
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//
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// Library: Foundation
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// Package: Core
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// Module: RefCountedObject
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//
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// Definition of the RefCountedObject class.
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//
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// Copyright (c) 2004-2009, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef Foundation_RefCountedObject_INCLUDED
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#define Foundation_RefCountedObject_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/AtomicCounter.h"
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namespace Poco {
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class Foundation_API RefCountedObject
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/// A base class for objects that employ
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/// reference counting based garbage collection.
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///
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/// Reference-counted objects inhibit construction
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/// by copying and assignment.
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{
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public:
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RefCountedObject();
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/// Creates the RefCountedObject.
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/// The initial reference count is one.
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void duplicate() const;
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/// Increments the object's reference count.
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void release() const;
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/// Decrements the object's reference count
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/// and deletes the object if the count
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/// reaches zero.
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int referenceCount() const;
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/// Returns the reference count.
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protected:
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virtual ~RefCountedObject();
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/// Destroys the RefCountedObject.
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private:
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RefCountedObject(const RefCountedObject&);
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RefCountedObject& operator = (const RefCountedObject&);
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mutable AtomicCounter _counter;
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};
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//
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// inlines
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//
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inline int RefCountedObject::referenceCount() const
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{
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return _counter.value();
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}
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inline void RefCountedObject::duplicate() const
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{
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++_counter;
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}
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inline void RefCountedObject::release() const
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{
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if (--_counter == 0) delete this;
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}
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} // namespace Poco
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#endif // Foundation_RefCountedObject_INCLUDED
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