[libcxx-commits] [PATCH] D129390: [lib++][ranges][NFC] Refactor `iterator_operations.h` to use tags.

[Konstantin Varlamov via Phabricator via libcxx-commits]

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Change the mechanism in `iterator_operations.h` to pass around a generic
tag indicating whether an internal function is being invoked from
a "classic" STL algorithm or a ranges algorithm. `IterOps` is now
a template class specialized on the tag.

The advantage is that this mechanism is more generic and allows defining
arbitrary conditions in a clean manner.

Also add a few more iterator functions to `IterOps`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D129390

Files:
  libcxx/include/__algorithm/equal_range.h
  libcxx/include/__algorithm/iterator_operations.h
  libcxx/include/__algorithm/lower_bound.h
  libcxx/include/__algorithm/ranges_binary_search.h
  libcxx/include/__algorithm/ranges_lower_bound.h
  libcxx/include/__algorithm/ranges_upper_bound.h

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