1//===- ASTDiffInternal.h --------------------------------------*- C++ -*- -===// 2// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef LLVM_CLANG_TOOLING_ASTDIFF_ASTDIFFINTERNAL_H 11#define LLVM_CLANG_TOOLING_ASTDIFF_ASTDIFFINTERNAL_H 12 13#include "clang/AST/ASTTypeTraits.h" 14 15namespace clang { 16namespace diff { 17 18using DynTypedNode = DynTypedNode; 19 20/// Within a tree, this identifies a node by its preorder offset. 21struct NodeId { 22private: 23 static constexpr int InvalidNodeId = -1; 24 25public: 26 int Id; 27 28 NodeId() : Id(InvalidNodeId) {} 29 NodeId(int Id) : Id(Id) {} 30 31 operator int() const { return Id; } 32 NodeId &operator++() { return ++Id, *this; } 33 NodeId &operator--() { return --Id, *this; } 34 // Support defining iterators on NodeId. 35 NodeId &operator*() { return *this; } 36 37 bool isValid() const { return Id != InvalidNodeId; } 38 bool isInvalid() const { return Id == InvalidNodeId; } 39}; 40 41} // end namespace diff 42} // end namespace clang 43#endif 44