[PATCH] D24842: Add StringRef {take, drop} x {_while, _until}

[Zachary Turner via llvm-commits]

zturner created this revision.
zturner added reviewers: majnemer, joker-eph.
zturner added a subscriber: llvm-commits.

    This adds support for some common functional style operations
    that allow you to take or drop characters until a certain
    condition is met.

Example: 

    assert(StringRef("ABCD2908XYZ".take_while([](char c) { return ::is_hexdigit(c); }) == "XYZ");

https://reviews.llvm.org/D24842

Files:
  include/llvm/ADT/StringRef.h
  unittests/ADT/StringRefTest.cpp

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