28 lines
998 B
C
28 lines
998 B
C
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//===-- None.h - Simple null value for implicit construction ------*- C++ -*-=//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file provides None, an enumerator for use in implicit constructors
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/// of various (usually templated) types to make such construction more
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/// terse.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_NONE_H
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#define LLVM_ADT_NONE_H
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namespace llvm {
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/// A simple null object to allow implicit construction of Optional<T>
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/// and similar types without having to spell out the specialization's name.
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// (constant value 1 in an attempt to workaround MSVC build issue... )
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enum class NoneType { None = 1 };
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const NoneType None = NoneType::None;
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}
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#endif
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