clang  9.0.0svn
ASTDiffInternal.h
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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 
14 
15 namespace clang {
16 namespace diff {
17 
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
bool isValid() const
Within a tree, this identifies a node by its preorder offset.
SyntaxTree objects represent subtrees of the AST.
Definition: ASTDiff.h:67
ast_type_traits::DynTypedNode DynTypedNode
Dataflow Directional Tag Classes.
A dynamically typed AST node container.
bool isInvalid() const