| //===-- None.h - Simple null value for implicit construction ------*- C++ -*-=// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| /// |
| /// \file |
| /// This file provides None, an enumerator for use in implicit constructors |
| /// of various (usually templated) types to make such construction more |
| /// terse. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_ADT_NONE_H |
| #define LLVM_ADT_NONE_H |
| |
| #include "llvm/Support/Compiler.h" |
| #include <optional> |
| |
| namespace llvm { |
| /// A simple null object to allow implicit construction of std::optional<T> |
| /// and similar types without having to spell out the specialization's name. |
| LLVM_DEPRECATED("Use std::nullopt_t instead", "std::nullopt_t") |
| typedef std::nullopt_t NoneType; |
| LLVM_DEPRECATED("Use std::nullopt instead.", "std::nullopt") |
| inline constexpr std::nullopt_t None = std::nullopt; |
| } |
| |
| #endif |