| //===-- 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 |
| //===----------------------------------------------------------------------===// |
| /// \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; |
