/usr/include/llvm-4.0/llvm/ADT/None.h is in llvm-4.0-dev 1:4.0.1-10.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | //===-- 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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