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/gecko_api/include/nsIInterfaceRequestorUtils.h

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 1/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 2 *
 3 * ***** BEGIN LICENSE BLOCK *****
 4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 5 *
 6 * The contents of this file are subject to the Mozilla Public License Version
 7 * 1.1 (the "License"); you may not use this file except in compliance with
 8 * the License. You may obtain a copy of the License at
 9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * The Original Code is the Mozilla browser.
17 *
18 * The Initial Developer of the Original Code is
19 * Netscape Communications, Inc.
20 * Portions created by the Initial Developer are Copyright (C) 1999
21 * the Initial Developer. All Rights Reserved.
22 *
23 * Contributor(s):
24 *
25 * Alternatively, the contents of this file may be used under the terms of
26 * either of the GNU General Public License Version 2 or later (the "GPL"),
27 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 * in which case the provisions of the GPL or the LGPL are applicable instead
29 * of those above. If you wish to allow use of your version of this file only
30 * under the terms of either the GPL or the LGPL, and not to allow others to
31 * use your version of this file under the terms of the MPL, indicate your
32 * decision by deleting the provisions above and replace them with the notice
33 * and other provisions required by the GPL or the LGPL. If you do not delete
34 * the provisions above, a recipient may use your version of this file under
35 * the terms of any one of the MPL, the GPL or the LGPL.
36 *
37 * ***** END LICENSE BLOCK ***** */
38
39#ifndef __nsInterfaceRequestorUtils_h
40#define __nsInterfaceRequestorUtils_h
41
42#include "nsCOMPtr.h"
43
44// a type-safe shortcut for calling the |GetInterface()| member function
45// T must inherit from nsIInterfaceRequestor, but the cast may be ambiguous.
46template <class T, class DestinationType>
47inline
48nsresult
49CallGetInterface( T* aSource, DestinationType** aDestination )
50  {
51    NS_PRECONDITION(aSource, "null parameter");
52    NS_PRECONDITION(aDestination, "null parameter");
53
54    return aSource->GetInterface(NS_GET_TEMPLATE_IID(DestinationType),
55                                 reinterpret_cast<void**>(aDestination));
56  }
57
58class NS_COM_GLUE nsGetInterface : public nsCOMPtr_helper
59  {
60    public:
61      nsGetInterface( nsISupports* aSource, nsresult* error )
62          : mSource(aSource),
63            mErrorPtr(error)
64        {
65          // nothing else to do here
66        }
67
68      virtual nsresult NS_FASTCALL operator()( const nsIID&, void** ) const;
69
70    private:
71      nsISupports*          mSource;
72      nsresult*             mErrorPtr;
73  };
74
75inline
76const nsGetInterface
77do_GetInterface( nsISupports* aSource, nsresult* error = 0 )
78  {
79    return nsGetInterface(aSource, error);
80  }
81
82#endif // __nsInterfaceRequestorUtils_h
83