LLVM  9.0.0svn
None.h
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1 //===-- None.h - Simple null value for implicit construction ------*- C++ -*-=//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file provides None, an enumerator for use in implicit constructors
10 // of various (usually templated) types to make such construction more
11 // terse.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_ADT_NONE_H
16 #define LLVM_ADT_NONE_H
17 
18 namespace llvm {
19 /// A simple null object to allow implicit construction of Optional<T>
20 /// and similar types without having to spell out the specialization's name.
21 // (constant value 1 in an attempt to workaround MSVC build issue... )
22 enum class NoneType { None = 1 };
24 }
25 
26 #endif
This class represents lattice values for constants.
Definition: AllocatorList.h:23
NoneType
A simple null object to allow implicit construction of Optional<T> and similar types without having t...
Definition: None.h:22