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File indexing completed on 2026-05-10 08:43:09
0001 //===- STLForwardCompat.h - Library features from future STLs ------C++ -*-===// 0002 // 0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 0004 // See https://llvm.org/LICENSE.txt for license information. 0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 0006 // 0007 //===----------------------------------------------------------------------===// 0008 /// 0009 /// \file 0010 /// This file contains library features backported from future STL versions. 0011 /// 0012 /// These should be replaced with their STL counterparts as the C++ version LLVM 0013 /// is compiled with is updated. 0014 /// 0015 //===----------------------------------------------------------------------===// 0016 0017 #ifndef LLVM_ADT_STLFORWARDCOMPAT_H 0018 #define LLVM_ADT_STLFORWARDCOMPAT_H 0019 0020 #include <optional> 0021 #include <type_traits> 0022 0023 namespace llvm { 0024 0025 //===----------------------------------------------------------------------===// 0026 // Features from C++20 0027 //===----------------------------------------------------------------------===// 0028 0029 template <typename T> 0030 struct remove_cvref // NOLINT(readability-identifier-naming) 0031 { 0032 using type = std::remove_cv_t<std::remove_reference_t<T>>; 0033 }; 0034 0035 template <typename T> 0036 using remove_cvref_t // NOLINT(readability-identifier-naming) 0037 = typename llvm::remove_cvref<T>::type; 0038 0039 //===----------------------------------------------------------------------===// 0040 // Features from C++23 0041 //===----------------------------------------------------------------------===// 0042 0043 // TODO: Remove this in favor of std::optional<T>::transform once we switch to 0044 // C++23. 0045 template <typename T, typename Function> 0046 auto transformOptional(const std::optional<T> &O, const Function &F) 0047 -> std::optional<decltype(F(*O))> { 0048 if (O) 0049 return F(*O); 0050 return std::nullopt; 0051 } 0052 0053 // TODO: Remove this in favor of std::optional<T>::transform once we switch to 0054 // C++23. 0055 template <typename T, typename Function> 0056 auto transformOptional(std::optional<T> &&O, const Function &F) 0057 -> std::optional<decltype(F(*std::move(O)))> { 0058 if (O) 0059 return F(*std::move(O)); 0060 return std::nullopt; 0061 } 0062 0063 /// Returns underlying integer value of an enum. Backport of C++23 0064 /// std::to_underlying. 0065 template <typename Enum> 0066 [[nodiscard]] constexpr std::underlying_type_t<Enum> to_underlying(Enum E) { 0067 return static_cast<std::underlying_type_t<Enum>>(E); 0068 } 0069 0070 } // namespace llvm 0071 0072 #endif // LLVM_ADT_STLFORWARDCOMPAT_H
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