arphaman added inline comments.
================
Comment at: lib/Tooling/ASTDiff/ASTDiff.cpp:303
+/// Identifies a node in this subtree by its postorder offset.
+using SNodeId = int;
+
----------------
johannes wrote:
> arphaman wrote:
> > What's the difference between `SNodeId` and `NodeId`?
> NodeId is the preorder offset inside the root tree, starting at 0.
> SNodeId is the postorder offset within a subtree, starting at 1.
> Not sure if this irregularity can be improved upon easily, but I guess I can
> mention it in the comments.
Ok. It's fine to have two different types for them, but to avoid confusions I
think that the code should be constructed in such a way that prohibits passing
in `NodeId` to a function that expects `SNodeId` and vice-versa. You can wrap
SNodeId in a typedef with an explicit constructor to achieve that goal, e.g.:
```
struct SNodeId {
int Id;
explicit SNodeId(int Id) : Id(Id) { };
};
```
https://reviews.llvm.org/D34329
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