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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#ifndef CATCH_META_HPP_INCLUDED
#define CATCH_META_HPP_INCLUDED
#include <type_traits>
namespace Catch {
template <typename>
struct true_given : std::true_type {};
struct is_callable_tester {
template <typename Fun, typename... Args>
static true_given<decltype(std::declval<Fun>()(std::declval<Args>()...))> test(int);
template <typename...>
static std::false_type test(...);
};
template <typename T>
struct is_callable;
template <typename Fun, typename... Args>
struct is_callable<Fun(Args...)> : decltype(is_callable_tester::test<Fun, Args...>(0)) {};
#if defined(__cpp_lib_is_invocable) && __cpp_lib_is_invocable >= 201703
// std::result_of is deprecated in C++17 and removed in C++20. Hence, it is
// replaced with std::invoke_result here.
template <typename Func, typename... U>
using FunctionReturnType = std::remove_reference_t<std::remove_cv_t<std::invoke_result_t<Func, U...>>>;
#else
template <typename Func, typename... U>
using FunctionReturnType = std::remove_reference_t<std::remove_cv_t<std::result_of_t<Func(U...)>>>;
#endif
} // namespace Catch
namespace mpl_{
struct na;
}
#endif // CATCH_META_HPP_INCLUDED
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