Warning: This file is not a C or C++ file. It does not have highlighting.
| 1 | //===-- include/flang/Common/enum-class.h -----------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // The macro |
| 10 | // ENUM_CLASS(className, enum1, enum2, ..., enumN) |
| 11 | // defines |
| 12 | // enum class className { enum1, enum2, ... , enumN }; |
| 13 | // as well as the introspective utilities |
| 14 | // static constexpr std::size_t className_enumSize{N}; |
| 15 | // static inline std::string_view EnumToString(className); |
| 16 | |
| 17 | #ifndef FORTRAN_COMMON_ENUM_CLASS_H_ |
| 18 | #define FORTRAN_COMMON_ENUM_CLASS_H_ |
| 19 | |
| 20 | #include <array> |
| 21 | #include <string> |
| 22 | |
| 23 | namespace Fortran::common { |
| 24 | |
| 25 | constexpr std::size_t CountEnumNames(const char *p) { |
| 26 | std::size_t n{0}; |
| 27 | std::size_t any{0}; |
| 28 | for (; *p; ++p) { |
| 29 | if (*p == ',') { |
| 30 | n += any; |
| 31 | any = 0; |
| 32 | } else if (*p != ' ') { |
| 33 | any = 1; |
| 34 | } |
| 35 | } |
| 36 | return n + any; |
| 37 | } |
| 38 | |
| 39 | template <std::size_t ITEMS> |
| 40 | constexpr std::array<std::string_view, ITEMS> EnumNames(const char *p) { |
| 41 | std::array<std::string_view, ITEMS> result{""}; |
| 42 | std::size_t at{0}; |
| 43 | const char *start{nullptr}; |
| 44 | for (; *p; ++p) { |
| 45 | if (*p == ',' || *p == ' ') { |
| 46 | if (start) { |
| 47 | result[at++] = |
| 48 | std::string_view{start, static_cast<std::size_t>(p - start)}; |
| 49 | start = nullptr; |
| 50 | } |
| 51 | } else if (!start) { |
| 52 | start = p; |
| 53 | } |
| 54 | } |
| 55 | if (start) { |
| 56 | result[at] = std::string_view{start, static_cast<std::size_t>(p - start)}; |
| 57 | } |
| 58 | return result; |
| 59 | } |
| 60 | |
| 61 | #define ENUM_CLASS(NAME, ...) \ |
| 62 | enum class NAME { __VA_ARGS__ }; \ |
| 63 | [[maybe_unused]] static constexpr std::size_t NAME##_enumSize{ \ |
| 64 | ::Fortran::common::CountEnumNames(#__VA_ARGS__)}; \ |
| 65 | [[maybe_unused]] static inline std::string_view EnumToString(NAME e) { \ |
| 66 | static const constexpr auto names{ \ |
| 67 | ::Fortran::common::EnumNames<NAME##_enumSize>(#__VA_ARGS__)}; \ |
| 68 | return names[static_cast<std::size_t>(e)]; \ |
| 69 | } |
| 70 | |
| 71 | } // namespace Fortran::common |
| 72 | #endif // FORTRAN_COMMON_ENUM_CLASS_H_ |
| 73 |
Warning: This file is not a C or C++ file. It does not have highlighting.