6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
//===- STLForwardCompat.h - Library features from future STLs ------C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file contains library features backported from future STL versions.
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///
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/// These should be replaced with their STL counterparts as the C++ version LLVM
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/// is compiled with is updated.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_STLFORWARDCOMPAT_H
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#define LLVM_ADT_STLFORWARDCOMPAT_H
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#include <optional>
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#include <type_traits>
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// Features from C++20
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//===----------------------------------------------------------------------===//
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template <typename T>
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struct remove_cvref // NOLINT(readability-identifier-naming)
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{
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using type = std::remove_cv_t<std::remove_reference_t<T>>;
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};
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template <typename T>
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using remove_cvref_t // NOLINT(readability-identifier-naming)
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= typename llvm::remove_cvref<T>::type;
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//===----------------------------------------------------------------------===//
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// Features from C++23
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//===----------------------------------------------------------------------===//
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// TODO: Remove this in favor of std::optional<T>::transform once we switch to
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// C++23.
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template <typename T, typename Function>
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auto transformOptional(const std::optional<T> &O, const Function &F)
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-> std::optional<decltype(F(*O))> {
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if (O)
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return F(*O);
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return std::nullopt;
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}
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// TODO: Remove this in favor of std::optional<T>::transform once we switch to
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// C++23.
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template <typename T, typename Function>
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auto transformOptional(std::optional<T> &&O, const Function &F)
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-> std::optional<decltype(F(*std::move(O)))> {
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if (O)
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return F(*std::move(O));
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return std::nullopt;
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}
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/// Returns underlying integer value of an enum. Backport of C++23
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/// std::to_underlying.
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template <typename Enum>
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[[nodiscard]] constexpr std::underlying_type_t<Enum> to_underlying(Enum E) {
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return static_cast<std::underlying_type_t<Enum>>(E);
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}
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} // namespace llvm
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#endif // LLVM_ADT_STLFORWARDCOMPAT_H
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