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IRIX 6.3 Development Libraries
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SGI IRIX 6.3 Development Libraries.iso
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dist
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dist6.3
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ViewKit_dev.idb
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usr
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include
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Vk
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VkBase.h.z
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VkBase.h
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C/C++ Source or Header
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1996-09-20
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2KB
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56 lines
////////////////////////////////////////////////////////////////////////////////
/////// Copyright 1995, Silicon Graphics, Inc. All Rights Reserved. ///////
// //
// This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.; //
// the contents of this file may not be disclosed to third parties, copied //
// or duplicated in any form, in whole or in part, without the prior written //
// permission of Silicon Graphics, Inc. //
// //
// RESTRICTED RIGHTS LEGEND: //
// Use,duplication or disclosure by the Government is subject to restrictions //
// as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data //
// and Computer Software clause at DFARS 252.227-7013, and/or in similar or //
// successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished - //
// rights reserved under the Copyright Laws of the United States. //
// //
////////////////////////////////////////////////////////////////////////////////
#ifndef VKBASE_H
#define VKBASE_H
// VkBase is an abstract class.
//
// The purpose is so that all ViewKit classes have a standard opaque
// pointer that can be used to extend the class without breaking binary
// compatibility.
//
// * The first time we can break binary compatibility, all ViewKit
// classes will be descendants of it.
//
// * In the meantime, all new ViewKit classes are subclassed from it.
//
//
// This pointer is for use only by classes that come with the ViewKit product.
// Unfortunately we cannot make it available to derived classes, because
// then it, too, would become a binary compatibility item. Derived
// libraries may wish to employ a similar strategy themselves.
//
// The constructor is included in the class so that it will get inlined in the
// constructor of each class that directly inherits from VkBase. Thus, there
// is no run-time penalty, such as there would be if a function call to the
// constructor were required.
class VkBase {
protected:
void *__extension_record;
VkBase() {__extension_record = 0;};
~VkBase() {};
};
#endif /* VKBASE_H */