arphaman added inline comments.

================
Comment at: include/clang/Basic/SourceManager.h:1539
+  /// \returns true if the callback returned true, false otherwise.
+  bool findFileIDsForFile(const FileEntry *SourceFile,
+                          llvm::function_ref<bool(FileID)> Callback) const;
----------------
ioeric wrote:
> Callback pattern seems uncommon in LLVM/Clang. I'd suggest making this return 
> a set of `FileID`s and put the callback-based function as a helper (shared by 
> this and `translateFile`)in the implementation.
I created a helper, but unfortunately it needs to be a member of SourceManager 
as FileID::get is private.


Repository:
  rC Clang

https://reviews.llvm.org/D50926



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