70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
// Filename: extension.h
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// Created by: rdb (11Sep13)
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//
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////////////////////////////////////////////////////////////////////
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//
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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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////////////////////////////////////////////////////////////////////
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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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// Class : ExtensionBase
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// Description : This is where all extensions should derive from.
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// It defines the _self and _this members that can
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// be used from the extension method.
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////////////////////////////////////////////////////////////////////
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template<class T>
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class EXPCL_DTOOLCONFIG ExtensionBase {
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public:
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T * _this;
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};
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////////////////////////////////////////////////////////////////////
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// Class : Extension
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// Description : The default class template does not define any
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// methods. Classes that are extended should create
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// a specialization of this class template.
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////////////////////////////////////////////////////////////////////
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template<class T>
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class EXPCL_DTOOLCONFIG Extension : public ExtensionBase<T> {
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};
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////////////////////////////////////////////////////////////////////
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// Function : invoke_extension
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// Description : Creates a new extension object for the given
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// pointer that can then be used to call extension
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// methods, as follows:
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// invoke_extension((MyClass) *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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// Function : invoke_extension
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// Description : 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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