6689e6d08f
have to use anchoring to root namespace in some places due to overlapping namespace and class type names.
70 lines
2.9 KiB
C++
70 lines
2.9 KiB
C++
// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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// vi: set et ts=4 sw=4 sts=4:
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/*
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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OPM 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 OPM. If not, see <http://www.gnu.org/licenses/>.
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Consult the COPYING file in the top-level source directory of this
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module for the precise wording of the license and the list of
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copyright holders.
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*/
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/*!
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* \file
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*
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* \copydoc OPM_GENERATE_HAS_MEMBER
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*/
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#ifndef OPM_HAS_MEMBER_GENERATOR_MACROS_HH
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#define OPM_HAS_MEMBER_GENERATOR_MACROS_HH
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/// \cond 0
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namespace Opm {
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template <class T>
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struct AlwaysVoid
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{
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typedef void type;
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};
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}
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/// \endcond
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/*!
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* \brief This macro generates a class HasMember_${MEMBER_NAME} which can be used for
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* template specialization.
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*
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* e.g. if OPM_GENERATE_HAS_MEMBER(foo, int(), int(), int()) has been used,
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* HasMember_foo<T>::value is true (if and only if) t.foo(int(), int(), int()) is a valid
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* expression for an object t of the class T.
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*/
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#define OPM_GENERATE_HAS_MEMBER(MEMBER_NAME, ...) \
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template <class T, class T2> \
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struct HasMember_##MEMBER_NAME##_Helper \
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{ \
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static constexpr bool value = false; \
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}; \
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\
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template <class T> \
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struct HasMember_##MEMBER_NAME##_Helper<T, \
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typename ::Opm::AlwaysVoid<decltype(std::declval<T>().MEMBER_NAME(__VA_ARGS__))>::type> \
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{ \
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static constexpr bool value = true; \
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}; \
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\
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template<typename T> \
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struct HasMember_##MEMBER_NAME \
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{ \
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static constexpr bool value = HasMember_##MEMBER_NAME##_Helper<T, void>::value; \
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};
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#endif
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