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| Rev | Author | Line No. | Line |
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| 14 | pmbaty | 1 | //===- TemplateArgumentVisitor.h - Visitor for TArg subclasses --*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file defines the TemplateArgumentVisitor interface. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_CLANG_AST_TEMPLATEARGUMENTVISITOR_H |
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| 14 | #define LLVM_CLANG_AST_TEMPLATEARGUMENTVISITOR_H |
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| 15 | |||
| 16 | #include "clang/AST/TemplateBase.h" |
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| 17 | |||
| 18 | namespace clang { |
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| 19 | |||
| 20 | namespace templateargumentvisitor { |
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| 21 | |||
| 22 | /// A simple visitor class that helps create template argument visitors. |
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| 23 | template <template <typename> class Ref, typename ImplClass, |
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| 24 | typename RetTy = void, typename... ParamTys> |
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| 25 | class Base { |
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| 26 | public: |
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| 27 | #define REF(CLASS) typename Ref<CLASS>::type |
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| 28 | #define DISPATCH(NAME) \ |
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| 29 | case TemplateArgument::NAME: \ |
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| 30 | return static_cast<ImplClass *>(this)->Visit##NAME##TemplateArgument( \ |
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| 31 | TA, std::forward<ParamTys>(P)...) |
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| 32 | |||
| 33 | RetTy Visit(REF(TemplateArgument) TA, ParamTys... P) { |
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| 34 | switch (TA.getKind()) { |
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| 35 | DISPATCH(Null); |
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| 36 | DISPATCH(Type); |
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| 37 | DISPATCH(Declaration); |
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| 38 | DISPATCH(NullPtr); |
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| 39 | DISPATCH(Integral); |
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| 40 | DISPATCH(Template); |
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| 41 | DISPATCH(TemplateExpansion); |
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| 42 | DISPATCH(Expression); |
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| 43 | DISPATCH(Pack); |
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| 44 | } |
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| 45 | llvm_unreachable("TemplateArgument is not covered in switch!"); |
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| 46 | } |
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| 47 | |||
| 48 | // If the implementation chooses not to implement a certain visit |
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| 49 | // method, fall back to the parent. |
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| 50 | |||
| 51 | #define VISIT_METHOD(CATEGORY) \ |
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| 52 | RetTy Visit##CATEGORY##TemplateArgument(REF(TemplateArgument) TA, \ |
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| 53 | ParamTys... P) { \ |
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| 54 | return VisitTemplateArgument(TA, std::forward<ParamTys>(P)...); \ |
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| 55 | } |
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| 56 | |||
| 57 | VISIT_METHOD(Null); |
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| 58 | VISIT_METHOD(Type); |
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| 59 | VISIT_METHOD(Declaration); |
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| 60 | VISIT_METHOD(NullPtr); |
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| 61 | VISIT_METHOD(Integral); |
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| 62 | VISIT_METHOD(Template); |
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| 63 | VISIT_METHOD(TemplateExpansion); |
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| 64 | VISIT_METHOD(Expression); |
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| 65 | VISIT_METHOD(Pack); |
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| 66 | |||
| 67 | RetTy VisitTemplateArgument(REF(TemplateArgument), ParamTys...) { |
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| 68 | return RetTy(); |
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| 69 | } |
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| 70 | |||
| 71 | #undef REF |
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| 72 | #undef DISPATCH |
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| 73 | #undef VISIT_METHOD |
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| 74 | }; |
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| 75 | |||
| 76 | } // namespace templateargumentvisitor |
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| 77 | |||
| 78 | /// A simple visitor class that helps create template argument visitors. |
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| 79 | /// |
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| 80 | /// This class does not preserve constness of TemplateArgument references (see |
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| 81 | /// also ConstTemplateArgumentVisitor). |
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| 82 | template <typename ImplClass, typename RetTy = void, typename... ParamTys> |
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| 83 | class TemplateArgumentVisitor |
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| 84 | : public templateargumentvisitor::Base<std::add_lvalue_reference, ImplClass, |
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| 85 | RetTy, ParamTys...> {}; |
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| 86 | |||
| 87 | /// A simple visitor class that helps create template argument visitors. |
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| 88 | /// |
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| 89 | /// This class preserves constness of TemplateArgument references (see also |
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| 90 | /// TemplateArgumentVisitor). |
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| 91 | template <typename ImplClass, typename RetTy = void, typename... ParamTys> |
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| 92 | class ConstTemplateArgumentVisitor |
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| 93 | : public templateargumentvisitor::Base<llvm::make_const_ref, ImplClass, |
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| 94 | RetTy, ParamTys...> {}; |
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| 95 | |||
| 96 | } // namespace clang |
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| 97 | |||
| 98 | #endif // LLVM_CLANG_AST_TEMPLATEARGUMENTVISITOR_H |