llvm/clang/include/clang/AST/DeclVisitor.h

//===- DeclVisitor.h - Visitor for Decl subclasses --------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
//  This file defines the DeclVisitor interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_DECLVISITOR_H
#define LLVM_CLANG_AST_DECLVISITOR_H

#include "clang/AST/Decl.h"
#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclFriend.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclOpenMP.h"
#include "clang/AST/DeclTemplate.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/ErrorHandling.h"

namespace clang {

namespace declvisitor {
/// A simple visitor class that helps create declaration visitors.
template<template <typename> class Ptr, typename ImplClass, typename RetTy=void>
class Base { … };

} // namespace declvisitor

/// A simple visitor class that helps create declaration visitors.
///
/// This class does not preserve constness of Decl pointers (see also
/// ConstDeclVisitor).
template <typename ImplClass, typename RetTy = void>
class DeclVisitor
    : public declvisitor::Base<std::add_pointer, ImplClass, RetTy> { … };

/// A simple visitor class that helps create declaration visitors.
///
/// This class preserves constness of Decl pointers (see also DeclVisitor).
template <typename ImplClass, typename RetTy = void>
class ConstDeclVisitor
    : public declvisitor::Base<llvm::make_const_ptr, ImplClass, RetTy> { … };

} // namespace clang

#endif // LLVM_CLANG_AST_DECLVISITOR_H