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