arphaman added inline comments.
================
Comment at: include/clang/AST/LexicallyOrderedRecursiveASTVisitor.h:149
+ auto Offset = [&](Stmt *S) { return SM.getFileOffset(S->getLocStart());
};
+ Swap = Offset(Children[0]) > Offset(Children[1]);
+ break;
----------------
For `++` and `--` you can see whether its prefix or postfix by looking at the
number of arguments. If there's one argument, then `++` and `--` are prefix.
Otherwise, they're postfix.
https://reviews.llvm.org/D37200
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