| //===-- 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| inline namespace __swift { inline namespace __runtime { |
| namespace llvm { |
| /// A simple null object to allow implicit construction of Optional<T> |
| /// and similar types without having to spell out the specialization's name. |
| // (constant value 1 in an attempt to workaround MSVC build issue... ) |
| enum class NoneType { None = 1 }; |
| const NoneType None = NoneType::None; |
| } |
| }} // swift::runtime |
| |
| #endif |
