| //===-- 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 |