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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
f0403dadab
Use CRTP to eliminate per-type declarations of `None`. Note this adds `None` to a few that may not need it, but eliminates a lot off boilerplate. Note this leaves `GenericInstIndex::None` because it has a more complex construction. Also fix `InstId::InitTombstone` to be `NoneIndex - 1`
32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_TOOLCHAIN_CHECK_SCOPE_INDEX_H_
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#define CARBON_TOOLCHAIN_CHECK_SCOPE_INDEX_H_
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#include "toolchain/base/index_base.h"
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namespace Carbon::Check {
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// An index for a pushed scope. This may correspond to a permanent scope with a
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// corresponding `NameScope`, in which case a different index will be assigned
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// each time the scope is entered. Alternatively, it may be a temporary scope
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// such as is created for a block, and will only be entered once.
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//
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// `ScopeIndex` values are comparable. Lower `ScopeIndex` values correspond to
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// scopes entered earlier in the file.
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struct ScopeIndex : public IndexBase<ScopeIndex> {
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static constexpr llvm::StringLiteral Label = "scope";
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static const ScopeIndex Package;
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using IndexBase::IndexBase;
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};
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constexpr ScopeIndex ScopeIndex::Package = ScopeIndex(0);
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_SCOPE_INDEX_H_
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