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/*
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* Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: Thin callback wrapper
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*
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*/
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// include guard for the whole file content
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#ifndef __TSHWCALLBACK_H__
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#define __TSHWCALLBACK_H__
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/**
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* Helper class to construct a TCallBack from any
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* public non static TInt (*method)() of a class
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* Usage:
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* TShwCallBack< %ClassName%, %&ClassName::%MethodName% >(
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* %ClassPointer% )
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* Example:
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* TShwCallBack< CShwEngineImpl, &CShwEngineImpl::DoStartL >(
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* this );
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*/
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template< class Object, TInt (Object::*Method)() >
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NONSHARABLE_CLASS( TShwCallBack ) : public TCallBack
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{
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public:
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/**
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* Constructor.
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* @param aInstance the object instance of the class
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*/
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inline TShwCallBack( Object* aInstance )
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: TCallBack( &DelegateL, aInstance )
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{}
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private:
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/**
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* The callback delegator. Inlined as we dont want
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* extra method to be created, static so that base
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* class can call it without pointer to this.
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* @param aInstance the instance to call back
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* @return the return value for the TCallBack
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*/
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inline static TInt DelegateL( TAny* aInstance )
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{
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// Dispatch the call to the real objects method
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return ( static_cast< Object* >( aInstance )->*Method )();
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}
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};
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#endif // __TSHWCALLBACK_H__
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