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 15 namespace clang { 16 namespace diff { 17 18 using DynTypedNode = DynTypedNode; 19 20 /// Within a tree, this identifies a node by its preorder offset. 21 struct NodeId { 22 private: 23 static constexpr int InvalidNodeId = -1; 24 25 public: 26 int Id; 27 NodeIdNodeId28 NodeId() : Id(InvalidNodeId) {} NodeIdNodeId29 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 isValidNodeId37 bool isValid() const { return Id != InvalidNodeId; } isInvalidNodeId38 bool isInvalid() const { return Id == InvalidNodeId; } 39 }; 40 41 } // end namespace diff 42 } // end namespace clang 43 #endif 44