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- //===-- None.h - Simple null value for implicit construction ------*- C++ -*-=//
- //
- // The LLVM Compiler Infrastructure
- //
- // This file is distributed under the University of Illinois Open Source
- // License. See LICENSE.TXT for details.
- //
- //===----------------------------------------------------------------------===//
- //
- // 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 {
- /// \brief A simple null object to allow implicit construction of Optional<T>
- /// and similar types without having to spell out the specialization's name.
- enum class NoneType { None };
- const NoneType None = None;
- }
- #endif
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