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dft_tools/triqs/utility/has_traits.hpp
Olivier Parcollet f2c7d449cc First commit : triqs libs version 1.0 alpha1
for earlier commits, see TRIQS0.x repository.
2013-07-17 19:24:07 +02:00

61 lines
3.0 KiB
C++

/*******************************************************************************
*
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
*
* Copyright (C) 2011 by O. Parcollet
*
* TRIQS 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.
*
* TRIQS 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
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
//#include <boost/preprocessor/punctuation/comma_if.hpp>
#include <boost/preprocessor/seq.hpp>
/**
* Usage :
* - The macro TRIQS_MAKE_TRAIT_HAS_METHOD ( ReturnType, ArgTypeList, Name, NickName )
* defines a trait called has_method_NickName such that :
* has_method_NickName<T>::value is true iff
* ReturnType T::Name(ArgTypeList)
* is a valid signature
*
* - The macro TRIQS_MAKE_TRAIT_HAS_CONST_METHOD ( ReturnType, ArgTypeList, Name, NickName )
* defines a trait called has_method_NickName such that :
* has_method_NickName<T>::value is true iff
* ReturnType T::Name(ArgTypeList) const
* is a valid signature
*
* - Where :
* ArgTypeList is a boost preprocessor sequence e.g.
* TRIQS_MAKE_TRAIT_HAS_CONST_METHOD (void, (int)(double)(string), Truc, Truc)
* makes the trait to check if a object A has method :
* void A::Truc(int,double,string) const
*
*/
#define TRIQS_MAKE_TRAIT_HAS_METHOD_AUX(r,s,p,XX) BOOST_PP_COMMA_IF(p) XX
#define TRIQS_MAKE_TRAIT_HAS_METHOD_IMPL( ReturnType, ArgTypeList, Name, NickName, CONST )\
template<typename T> struct has_method_##NickName {\
typedef char yes[1]; typedef char no[2];\
template<typename U, ReturnType (U::*)(BOOST_PP_SEQ_FOR_EACH_I (TRIQS_MAKE_TRAIT_HAS_METHOD_AUX,~,ArgTypeList)) CONST> struct SFINAE {};\
template<typename U> static yes& Test(SFINAE<U, &U::Name>*);\
template<typename U> static no& Test(...);\
static const bool value = sizeof(Test<T>(0)) == sizeof(yes);\
};
#define TRIQS_MAKE_TRAIT_HAS_METHOD( ReturnType, ArgTypeList, Name, NickName) TRIQS_MAKE_TRAIT_HAS_METHOD_IMPL(ReturnType,ArgTypeList,Name,NickName,)
#define TRIQS_MAKE_TRAIT_HAS_CONST_METHOD( ReturnType, ArgTypeList, Name, NickName) TRIQS_MAKE_TRAIT_HAS_METHOD_IMPL(ReturnType,ArgTypeList,Name,NickName,const)
//#define TRIQS_MAKE_TRAIT_HAS_METHOD_TPL( ReturnType, ArgTypeList, TPL,Name, NickName) TRIQS_MAKE_TRAIT_HAS_METHOD_IMPL(ReturnType,ArgTypeList,Name,NickName,,TPL)
//#define TRIQS_MAKE_TRAIT_HAS_CONST_METHOD_TPL( ReturnType, ArgTypeList, TPL, Name, NickName) TRIQS_MAKE_TRAIT_HAS_METHOD_IMPL(ReturnType,ArgTypeList,Name,NickName,const,TPL)