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51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
/*
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* Created by Jozef on 02/12/2018.
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* Copyright 2018 Two Blue Cubes Ltd. All rights reserved.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef TWOBLUECUBES_CATCH_META_HPP_INCLUDED
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#define TWOBLUECUBES_CATCH_META_HPP_INCLUDED
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#include <type_traits>
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namespace Catch {
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template<typename T>
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struct always_false : std::false_type {};
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template <typename> struct true_given : std::true_type {};
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struct is_callable_tester {
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template <typename Fun, typename... Args>
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true_given<decltype(std::declval<Fun>()(std::declval<Args>()...))> static test(int);
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template <typename...>
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std::false_type static test(...);
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};
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template <typename T>
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struct is_callable;
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template <typename Fun, typename... Args>
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struct is_callable<Fun(Args...)> : decltype(is_callable_tester::test<Fun, Args...>(0)) {};
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#if defined(__cpp_lib_is_invocable) && __cpp_lib_is_invocable >= 201703
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// std::result_of is deprecated in C++17 and removed in C++20. Hence, it is
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// replaced with std::invoke_result here. Also *_t format is preferred over
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// typename *::type format.
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template <typename Func, typename U>
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using FunctionReturnType = std::remove_reference_t<std::remove_cv_t<std::invoke_result_t<Func, U>>>;
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#else
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template <typename Func, typename U>
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using FunctionReturnType = typename std::remove_reference<typename std::remove_cv<typename std::result_of<Func(U)>::type>::type>::type;
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#endif
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} // namespace Catch
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namespace mpl_{
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struct na;
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}
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#endif // TWOBLUECUBES_CATCH_META_HPP_INCLUDED
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