factory_trait.hh

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/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis 
 * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
 *
 * MIA is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef mia_core_factory_trait_hh
#define mia_core_factory_trait_hh

#include <mia/core/defines.hh>
#include <memory>

NS_MIA_BEGIN
template <class T> 
class FactoryTrait {
        typedef typename T::must_create_trait_using_FACTORY_TRAIT type; 
}; 

template <class T> 
class FactoryTrait<std::shared_ptr<T> >  {
public: 
        typedef typename FactoryTrait<T>::type type; 
}; 

#define FACTORY_TRAIT(F)                        \
        template <>                             \
        class FactoryTrait< F::Instance::ProductPtr::element_type >  {  \
        public:                                 \
        typedef F type;         \
        }; 


NS_MIA_END

#endif