6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
//===- TemplateArgumentVisitor.h - Visitor for TArg subclasses --*- 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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// This file defines the TemplateArgumentVisitor interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_TEMPLATEARGUMENTVISITOR_H
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#define LLVM_CLANG_AST_TEMPLATEARGUMENTVISITOR_H
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#include "clang/AST/TemplateBase.h"
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namespace clang {
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namespace templateargumentvisitor {
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/// A simple visitor class that helps create template argument visitors.
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template <template <typename> class Ref, typename ImplClass,
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typename RetTy = void, typename... ParamTys>
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class Base {
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public:
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#define REF(CLASS) typename Ref<CLASS>::type
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#define DISPATCH(NAME) \
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case TemplateArgument::NAME: \
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return static_cast<ImplClass *>(this)->Visit##NAME##TemplateArgument( \
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TA, std::forward<ParamTys>(P)...)
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RetTy Visit(REF(TemplateArgument) TA, ParamTys... P) {
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switch (TA.getKind()) {
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DISPATCH(Null);
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DISPATCH(Type);
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DISPATCH(Declaration);
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DISPATCH(NullPtr);
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DISPATCH(Integral);
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DISPATCH(StructuralValue);
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DISPATCH(Template);
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DISPATCH(TemplateExpansion);
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DISPATCH(Expression);
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DISPATCH(Pack);
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}
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llvm_unreachable("TemplateArgument is not covered in switch!");
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}
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// If the implementation chooses not to implement a certain visit
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// method, fall back to the parent.
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#define VISIT_METHOD(CATEGORY) \
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RetTy Visit##CATEGORY##TemplateArgument(REF(TemplateArgument) TA, \
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ParamTys... P) { \
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return VisitTemplateArgument(TA, std::forward<ParamTys>(P)...); \
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}
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VISIT_METHOD(Null);
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VISIT_METHOD(Type);
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VISIT_METHOD(Declaration);
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VISIT_METHOD(NullPtr);
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VISIT_METHOD(Integral);
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VISIT_METHOD(StructuralValue);
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VISIT_METHOD(Template);
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VISIT_METHOD(TemplateExpansion);
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VISIT_METHOD(Expression);
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VISIT_METHOD(Pack);
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RetTy VisitTemplateArgument(REF(TemplateArgument), ParamTys...) {
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return RetTy();
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}
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#undef REF
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#undef DISPATCH
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#undef VISIT_METHOD
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};
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} // namespace templateargumentvisitor
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/// A simple visitor class that helps create template argument visitors.
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///
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/// This class does not preserve constness of TemplateArgument references (see
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/// also ConstTemplateArgumentVisitor).
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template <typename ImplClass, typename RetTy = void, typename... ParamTys>
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class TemplateArgumentVisitor
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: public templateargumentvisitor::Base<std::add_lvalue_reference, ImplClass,
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RetTy, ParamTys...> {};
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/// A simple visitor class that helps create template argument visitors.
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///
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/// This class preserves constness of TemplateArgument references (see also
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/// TemplateArgumentVisitor).
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template <typename ImplClass, typename RetTy = void, typename... ParamTys>
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class ConstTemplateArgumentVisitor
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: public templateargumentvisitor::Base<llvm::make_const_ref, ImplClass,
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RetTy, ParamTys...> {};
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} // namespace clang
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#endif // LLVM_CLANG_AST_TEMPLATEARGUMENTVISITOR_H
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