61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file extension.h
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* @author rdb
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* @date 2013-09-11
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*/
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#ifndef EXTENSION_H
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#define EXTENSION_H
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#include "dtoolbase.h"
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/**
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* This is where all extensions should derive from. It defines the _self and
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* _this members that can be used from the extension method.
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*/
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template<class T>
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class EXPCL_INTERROGATEDB ExtensionBase {
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public:
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T * _this;
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};
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/**
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* The default class template does not define any methods. Classes that are
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* extended should create a specialization of this class template.
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*/
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template<class T>
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class Extension : public ExtensionBase<T> {
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};
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/**
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* Creates a new extension object for the given pointer that can then be used
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* to call extension methods, as follows: invoke_extension((MyClass)
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* *ptr).method()
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*/
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template<class T>
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inline Extension<T>
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invoke_extension(T *ptr) {
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Extension<T> ext;
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ext._this = ptr;
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return ext;
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}
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/**
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* The const version of the above function.
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*/
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template<class T>
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inline const Extension<T>
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invoke_extension(const T *ptr) {
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Extension<T> ext;
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ext._this = (T *) ptr;
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return ext;
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}
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#endif
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