Martin Hořeňovský
a822cb9717
This commit also strips the old copyright comment header in touched files, as those will also be replaced with a more standardized and machine-friendly version.
42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
#ifndef CATCH_META_HPP_INCLUDED
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#define 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.
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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 = std::remove_reference_t<std::remove_cv_t<std::result_of_t<Func(U...)>>>;
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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 // CATCH_META_HPP_INCLUDED
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