[PATCH] D48342: [libcxx] Optimize vectors construction of trivial types from an iterator range with const-ness mismatch.

[Volodymyr Sapsai via Phabricator via cfe-commits]

vsapsai updated this revision to Diff 153430.
vsapsai added a comment.
Herald added a subscriber: dexonsmith.

- Don't check `!__has_construct` for `__construct_range_forward`.

Incompatible types will cause a lack of `construct` but it doesn't mean we
should use memcpy instead. And missing `_Alloc::construct` doesn't mean
`alloc_traits::construct` will fail, so falling back on memcpy can be
premature.


https://reviews.llvm.org/D48342

Files:
  libcxx/include/memory
  libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp
  libcxx/test/std/containers/sequences/vector/vector.cons/construct_iter_iter_different_value_type.pass.cpp

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