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 class SyntaxTree; 21 class SyntaxTreeImpl; 22 struct ComparisonOptions; 23 24 /// Within a tree, this identifies a node by its preorder offset. 25 struct NodeId { 26 private: 27 static constexpr int InvalidNodeId = -1; 28 29 public: 30 int Id; 31 32 NodeId() : Id(InvalidNodeId) {} 33 NodeId(int Id) : Id(Id) {} 34 35 operator int() const { return Id; } 36 NodeId &operator++() { return ++Id, *this; } 37 NodeId &operator--() { return --Id, *this; } 38 // Support defining iterators on NodeId. 39 NodeId &operator*() { return *this; } 40 41 bool isValid() const { return Id != InvalidNodeId; } 42 bool isInvalid() const { return Id == InvalidNodeId; } 43 }; 44 45 } // end namespace diff 46 } // end namespace clang 47 #endif 48