| // -*-c++-*- |
| // vim: set ft=cpp: |
| |
| /* Distributed under the OSI-approved BSD 3-Clause License. See accompanying |
| file Copyright.txt or https://cmake.org/licensing for details. */ |
| #pragma once |
| |
| #include <type_traits> // IWYU pragma: export |
| |
| namespace cm { |
| |
| #if __cplusplus >= 201402L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201402L) |
| |
| // Miscellaneous transformations |
| template <bool B, typename T = void> |
| using enable_if_t = std::enable_if_t<B, T>; |
| |
| #else |
| |
| // Miscellaneous transformations |
| template <bool B, typename T = void> |
| using enable_if_t = typename std::enable_if<B, T>::type; |
| |
| #endif |
| |
| #if __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703) |
| |
| // Helper classes |
| using std::bool_constant; |
| |
| // Miscellaneous transformations |
| using std::invoke_result; |
| using std::invoke_result_t; |
| |
| using std::void_t; |
| |
| #else |
| |
| // Helper classes |
| template <bool B> |
| using bool_constant = std::integral_constant<bool, B>; |
| |
| // Miscellaneous transformations |
| template <typename F, typename... ArgTypes> |
| using invoke_result = std::result_of<F(ArgTypes...)>; |
| |
| template <class F, typename... ArgTypes> |
| using invoke_result_t = typename invoke_result<F, ArgTypes...>::type; |
| |
| template <typename... ArgTypes> |
| struct make_void |
| { |
| typedef void type; |
| }; |
| template <typename... ArgTypes> |
| using void_t = typename make_void<ArgTypes...>::type; |
| |
| #endif |
| |
| } // namespace cm |