66 lines
2.4 KiB
Plaintext
66 lines
2.4 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_OBJECT
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#define OSG_OBJECT 1
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#include <osg/Referenced>
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namespace osg {
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/** META_Object macro define the standard clone, isSameKindAs and className methods.
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* Use when subclassing from Object to make it more convinient to define
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* the standard pure virtual clone, isSameKindAs and className methods
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* which are required for all Object subclasses.*/
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#define META_Object(name) \
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virtual osg::Object* clone() const { return new name (); } \
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virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const name *>(obj)!=NULL; } \
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virtual const char* className() const { return #name; }
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/** Base class/standard interface for objects which require IO support,
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cloning and reference counting.
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Based on GOF Composite, Prototype and Template Method patterns.
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*/
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class SG_EXPORT Object : public Referenced
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{
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public:
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/** Construct an object. Note Object is a pure virtual base class
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and therefore cannot be constructed on its own, only derived
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classes which override the clone and className methods are
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concrete classes and can be constructed.*/
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Object() {}
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/** return a shallow copy of a node, with Object* return type.
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Must be defined by derived classes.*/
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virtual Object* clone() const = 0;
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virtual bool isSameKindAs(const Object*) const { return true; }
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/** return the name of the object's class type. Must be defined
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by derived classes.*/
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virtual const char* className() const = 0;
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protected:
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/** Object destructor. Note, is protected so that Objects cannot
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be deleted other than by being dereferenced and the reference
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count being zero (see osg::Referenced), preventing the deletion
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of nodes which are still in use. This also means that
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Node's cannot be created on stack i.e Node node will not compile,
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forcing all nodes to be created on the heap i.e Node* node
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= new Node().*/
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virtual ~Object() {}
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private:
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/** disallow any form of deep copy.*/
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Object(Object&): Referenced() {}
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Object& operator = (const Object&) { return *this; }
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};
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};
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#endif
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