Ichthyostega
6bdf0e2cdc
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112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
/*
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SINGLETONPRECONFIGURE - declare the configuration of some Singleton types in advance
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Copyright (C) CinelerraCV
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2007, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file singletonpreconfigure.hpp
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** Preconfiguration of some Singleton types, done by template specialisation.
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** Typically the client code just includes singleton.h and uses the Singleton
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** type. But in some cases, we want to configure specific (dependency injection)
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** behaviour at a central location. At some point, we may well have a full blown
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** Dependency Manager, but for the moment using just some specialized Singleton
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** type for some instances seems sufficient.
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**
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** One reason why one wants special Singleton behaviour is testing: Without
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** altering the executable, for running some tests we need to inject a Test Mock
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** in place of some service object, so we can verify the behaviour of the code
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** <i>using</i> this service. For this, we mix cinelerra::test::MockInjector
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** into the actual Singleton type.
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**
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** @note we declare the specialisations into the target namespace
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**
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** @see SingletonFactory
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** @see singletontestmocktest.hpp
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*/
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#ifndef CINELERRA_SINGLETONPRECONFIGURE_H
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#define CINELERRA_SINGLETONPRECONFIGURE_H
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#include "common/test/mockinjector.hpp"
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namespace cinelerra
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{
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/**
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* Default Singleton configuration
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* @note all Policy template parameters taking default values
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*/
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template <class SI>
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class Singleton
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: public SingletonFactory<SI>
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{ }
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;
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/* ********************************************************************** */
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/* Forward declarations of all Classes we want to specialize the template */
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/* ********************************************************************** */
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namespace test
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{
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class TestSingletonO;
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using cinelerra::Singleton;
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} // namespace test
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} // namespace cinelerra
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namespace backend_interface
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{
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class MediaAccessFacade;
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using cinelerra::Singleton;
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} // namespace backend_interface
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/* ************************** */
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/* Specialisation Definitions */
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/* ************************** */
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namespace cinelerra
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{
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using test::MockInjector;
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template<>
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class Singleton<test::TestSingletonO>
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: public MockInjector<test::TestSingletonO>
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{ };
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template<>
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class Singleton<backend_interface::MediaAccessFacade>
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: public MockInjector<backend_interface::MediaAccessFacade>
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{ };
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} // namespace cinelerra
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#endif
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