gecko-dev/lib/libmsg/msg_opaq.h

54 строки
1.4 KiB
C++

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