[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 created this revision.
vsapsai added reviewers: mclow.lists, EricWF.
Herald added a subscriber: christof.

We already have a specialization that will use memcpy for construction
of trivial types from an iterator range like

  std::vector<int>(int *, int *);

But if we have const-ness mismatch like

  std::vector<int>(const int *, const int *);

we would use a slow path that copies each element individually. This change
enables the optimal specialization for const-ness mismatch. Fixes PR37574.

rdar://problem/40485845


https://reviews.llvm.org/D48342

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

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