[PATCH] D24686: [support] Some improvements to StringSwitch

[Zachary Turner via llvm-commits]

zturner created this revision.
zturner added reviewers: rsmith, chandlerc.
zturner added a subscriber: llvm-commits.
Herald added subscribers: mgorny, beanz.

This patch does a number of things:

1. Adds case-insensitive versions of all case functions.  This means `CaseLower`, `StartsWithLower`, `EndsWithLower`, and `CasesLower`.
2. Converts the `Cases` function to use variadic templates.  Thanks to rsmith@ for the magic incantation to make this work.
3. Adds an alternative to `Default()` that returns an `llvm::Expected<T>`.  This is useful when you `Default` is insufficient to determine that a switch fell off the end.
3. Adds unit tests for the new case-insensitive versions of the function, as well as the old ones (there were previously 0 unit tests for `StringSwitch`).

https://reviews.llvm.org/D24686

Files:
  include/llvm/ADT/StringSwitch.h
  unittests/ADT/CMakeLists.txt
  unittests/ADT/StringSwitchTest.cpp

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