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83 lines
2.7 KiB
C++
83 lines
2.7 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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// 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 <type_traits>
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// Features from C++17
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//===----------------------------------------------------------------------===//
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template <typename T>
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struct negation // NOLINT(readability-identifier-naming)
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: std::integral_constant<bool, !bool(T::value)> {};
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template <typename...>
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struct conjunction // NOLINT(readability-identifier-naming)
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: std::true_type {};
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template <typename B1> struct conjunction<B1> : B1 {};
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template <typename B1, typename... Bn>
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struct conjunction<B1, Bn...>
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: std::conditional<bool(B1::value), conjunction<Bn...>, B1>::type {};
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template <typename...>
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struct disjunction // NOLINT(readability-identifier-naming)
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: std::false_type {};
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template <typename B1> struct disjunction<B1> : B1 {};
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template <typename B1, typename... Bn>
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struct disjunction<B1, Bn...>
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: std::conditional<bool(B1::value), B1, disjunction<Bn...>>::type {};
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struct in_place_t // NOLINT(readability-identifier-naming)
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{
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explicit in_place_t() = default;
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};
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/// \warning This must not be odr-used, as it cannot be made \c inline in C++14.
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constexpr in_place_t in_place; // NOLINT(readability-identifier-naming)
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template <typename T>
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struct in_place_type_t // NOLINT(readability-identifier-naming)
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{
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explicit in_place_type_t() = default;
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};
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template <std::size_t I>
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struct in_place_index_t // NOLINT(readability-identifier-naming)
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{
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explicit in_place_index_t() = default;
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};
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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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} // namespace llvm
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#endif // LLVM_ADT_STLFORWARDCOMPAT_H
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