32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
//===-- None.h - Simple null value for implicit construction ------*- 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 provides None, an enumerator for use in implicit constructors
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/// of various (usually templated) types to make such construction more
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/// terse.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_NONE_H
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#define LLVM_ADT_NONE_H
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#include "llvm/Support/Compiler.h"
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#include <optional>
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namespace llvm {
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/// A simple null object to allow implicit construction of std::optional<T>
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/// and similar types without having to spell out the specialization's name.
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LLVM_DEPRECATED("Use std::nullopt_t instead", "std::nullopt_t")
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typedef std::nullopt_t NoneType;
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LLVM_DEPRECATED("Use std::nullopt instead.", "std::nullopt")
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inline constexpr std::nullopt_t None = std::nullopt;
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}
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#endif
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