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- //===-- 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
- 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;
- }
- #endif
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