58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/**
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This file is a part of rexy's general purpose library
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Copyright (C) 2020 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef REXY_TRAITS_HPP
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#define REXY_TRAITS_HPP
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#include <type_traits> //is_same, decay, integral_constant, declval
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namespace rexy{
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template<class T, class U>
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struct is_type{
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static std::true_type check(U*);
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static std::false_type check(...);
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static constexpr bool value = std::is_same<std::true_type,decltype(check(std::declval<std::decay_t<T>*>()))>::value;
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};
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template<class T, template<class...> class U>
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struct is_template_type_helper{
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static constexpr bool value = false;
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};
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template<template<class...> class U, class... Args>
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struct is_template_type_helper<U<Args...>,U>{
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static constexpr bool value = true;
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};
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template<class T, template<class...> class U>
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struct is_template_type : public is_template_type_helper<std::decay_t<T>,U>{};
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template<class T, template<class...> class Tmpl>
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struct is_template_derived_type{
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template<class... Args>
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static std::true_type test(Tmpl<Args...>*);
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static std::false_type test(void*);
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static constexpr bool value = std::is_same<std::true_type,decltype(test(static_cast<std::decay_t<T>*>(nullptr)))>::value;
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};
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}
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#endif
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