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//===--- TypeVisitor.h - Visitor for Type subclasses ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the TypeVisitor interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_TYPEVISITOR_H
#define LLVM_CLANG_AST_TYPEVISITOR_H
#include "clang/AST/Type.h"
namespace clang {
#define DISPATCH(CLASS) \
return static_cast<ImplClass*>(this)-> \
Visit##CLASS(static_cast<const CLASS*>(T))
template<typename ImplClass, typename RetTy=void>
class TypeVisitor {
public:
RetTy Visit(const Type *T) {
// Top switch stmt: dispatch to VisitFooType for each FooType.
switch (T->getTypeClass()) {
default: assert(0 && "Unknown type class!");
#define ABSTRACT_TYPE(CLASS, PARENT)
#define TYPE(CLASS, PARENT) case Type::CLASS: DISPATCH(CLASS##Type);
#include "clang/AST/TypeNodes.def"
}
}
// If the implementation chooses not to implement a certain visit method, fall
// back on superclass.
#define TYPE(CLASS, PARENT) RetTy Visit##CLASS##Type(const CLASS##Type *T) { \
DISPATCH(PARENT); \
}
#include "clang/AST/TypeNodes.def"
// Base case, ignore it. :)
RetTy VisitType(const Type*) { return RetTy(); }
};
#undef DISPATCH
} // end namespace clang
#endif
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