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104 lines
2.2 KiB
C++
104 lines
2.2 KiB
C++
//
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// DOMObject.h
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//
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// Library: XML
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// Package: DOM
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// Module: DOM
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//
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// Definition of the DOMObject class.
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//
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// Copyright (c) 2004-2006, 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 DOM_DOMObject_INCLUDED
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#define DOM_DOMObject_INCLUDED
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#include "Poco/XML/XML.h"
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namespace Poco {
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namespace XML {
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class XML_API DOMObject
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/// The base class for all objects in the Document Object Model.
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///
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/// DOMObject defines the rules for memory management
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/// in this implementation of the DOM. Violation of these
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/// rules, which are outlined in the following, results
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/// in memory leaks or dangling pointers.
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///
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/// Every object created by new or by a factory
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/// method (for example, Document::create*) must be released
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/// with a call to release() or autoRelease() when it
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/// is no longer needed.
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///
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/// Every object created by cloning or importing another
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/// object must be released.
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/// For every call to duplicate() there must be a matching
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/// call to release().
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/// An object obtained via any other way must not be
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/// released, except ownership of it has been explicitly
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/// taken with a call to duplicate().
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///
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/// While DOMObjects are safe for use in multithreaded programs,
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/// a DOMObject or one of its subclasses must not be accessed
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/// from multiple threads simultaneously.
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{
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public:
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DOMObject();
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/// Creates the DOMObject.
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/// The object's reference count is initialized to one.
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void duplicate() const;
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/// Increases the object's reference count.
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void release() const;
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/// Decreases the object's reference count.
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/// If the reference count reaches zero,
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/// the object is deleted.
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virtual void autoRelease() = 0;
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/// Adds the object to an appropriate
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/// AutoReleasePool, which is usually the
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/// AutoReleasePool managed by the Document
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/// to which this object belongs.
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protected:
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virtual ~DOMObject();
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/// Destroys the DOMObject.
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private:
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DOMObject(const DOMObject&);
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DOMObject& operator = (const DOMObject&);
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mutable int _rc;
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};
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//
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// inlines
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//
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inline void DOMObject::duplicate() const
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{
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++_rc;
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}
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inline void DOMObject::release() const
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{
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if (--_rc == 0)
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delete this;
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}
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} } // namespace Poco::XML
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#endif // DOM_DOMObject_INCLUDED
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