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lightning-sunbird  0.9+nobinonly
ipcMessageUtils.h
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00001 /* ***** BEGIN LICENSE BLOCK *****
00002  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00003  *
00004  * The contents of this file are subject to the Mozilla Public License Version
00005  * 1.1 (the "License"); you may not use this file except in compliance with
00006  * the License. You may obtain a copy of the License at
00007  * http://www.mozilla.org/MPL/
00008  *
00009  * Software distributed under the License is distributed on an "AS IS" basis,
00010  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00011  * for the specific language governing rights and limitations under the
00012  * License.
00013  *
00014  * The Original Code is Mozilla IPC.
00015  *
00016  * The Initial Developer of the Original Code is
00017  * Netscape Communications Corporation.
00018  * Portions created by the Initial Developer are Copyright (C) 2002
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *   Darin Fisher <darin@netscape.com>
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #ifndef ipcMessageUtils_h__
00039 #define ipcMessageUtils_h__
00040 
00041 class ipcMessage;
00042 
00043 //
00044 // given code like this:
00045 //   
00046 //    const ipcmMessageClientID *msg = (const ipcmMessageClientID *) rawMsg;
00047 //
00048 // we can write:
00049 //
00050 //    ipcMessageCast<ipcmMessageClientID> msg(rawMsg);
00051 //
00052 // XXX ipcMessageCast is probably not the best name for this class.
00053 //
00054 template<class T>
00055 class ipcMessageCast
00056 {
00057 public:
00058     ipcMessageCast() : mPtr(NULL) {}
00059     ipcMessageCast(const ipcMessage *ptr) : mPtr((const T *) ptr) {}
00060     void operator=(const ipcMessage *ptr) { mPtr = (const T *) ptr; }
00061     const T *operator->() { return mPtr; }
00062 private:
00063     const T *mPtr;
00064 };
00065 
00066 #endif // !ipcMessageUtils_h__