[PATCH] D30570: Option parsing: implement decrement operators for arg_iterator

[George Rimar via Phabricator via llvm-commits]

grimar created this revision.

Implementing of decrement operators allows doing things like:

  for (auto *Arg : llvm::reverse(Args.filtered(OPT_z)))


https://reviews.llvm.org/D30570

Files:
  include/llvm/Option/ArgList.h
  lib/Option/ArgList.cpp
  unittests/Option/OptionParsingTest.cpp

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