| // Copyright 2022 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_TYPES_CXX23_TO_UNDERLYING_H_ |
| #define BASE_TYPES_CXX23_TO_UNDERLYING_H_ |
| |
| #include <type_traits> |
| |
| namespace base { |
| |
| // Implementation of C++23's std::to_underlying. |
| // |
| // Note: This has an additional `std::is_enum<EnumT>` requirement to be SFINAE |
| // friendly prior to C++20. |
| // |
| // Reference: https://en.cppreference.com/w/cpp/utility/to_underlying |
| template <typename EnumT, typename = std::enable_if_t<std::is_enum<EnumT>{}>> |
| constexpr std::underlying_type_t<EnumT> to_underlying(EnumT e) noexcept { |
| return static_cast<std::underlying_type_t<EnumT>>(e); |
| } |
| |
| } // namespace base |
| |
| #endif // BASE_TYPES_CXX23_TO_UNDERLYING_H_ |
