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//
// RefCountedObject.h
//
// Library: Foundation
// Package: Core
// Module: RefCountedObject
//
// Definition of the RefCountedObject class.
//
// Copyright (c) 2004-2009, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#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 noexcept;
/// 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 noexcept
{
try
{
if (--_counter == 0) delete this;
}
catch (...)
{
poco_unexpected();
}
}
} // namespace Poco
#endif // Foundation_RefCountedObject_INCLUDED
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