[PATCH] D22951: [ADT] Add filter_iterator for filtering elements

[Tim Shen via llvm-commits]

timshen created this revision.
timshen added reviewers: dblaikie, chandlerc.
timshen added a subscriber: llvm-commits.

filter_iterator is an iterator adaptor that filters a given iterator by a given predicate.

https://reviews.llvm.org/D22951

Files:
  include/llvm/ADT/STLExtras.h
  unittests/Support/IteratorTest.cpp

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