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54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/* Defines a base class designed to validate objects across the C to C++ API */
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#ifndef _MSG_OPAQ_H
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#define _MSG_OPAQ_H
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struct msg_OpaqueObject
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{
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public:
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msg_OpaqueObject (uint32 magic);
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virtual ~msg_OpaqueObject ();
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XP_Bool IsValid ();
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protected:
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virtual uint32 GetExpectedMagic() = 0;
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XP_Bool m_deleted;
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uint32 m_magic;
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};
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inline msg_OpaqueObject::msg_OpaqueObject (uint32 magic)
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{
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m_magic = magic;
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m_deleted = FALSE;
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}
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inline msg_OpaqueObject::~msg_OpaqueObject ()
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{
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m_deleted = TRUE;
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}
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inline XP_Bool msg_OpaqueObject::IsValid ()
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{
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// might die simply calling thru the v-table. definitely invalid!
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return (this && !m_deleted) && (m_magic == GetExpectedMagic());
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}
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#endif
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