[libcxx-dev] std::vector using copy constructor on existing elements during reserve()

[Michael Narigon via libcxx-dev]

std:vector is using the element copy constructor on existing elements during its resizing operation in reserve(). I would expect it to use the move constructor for efficiency. Is this intended behavior?

This is with the libc++ delivered with Xcode 10.1.

Attached is a sample program displaying the behavior.
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