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58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/* -*- 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
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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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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