:idprefix: unordered_flat_map_

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`std::pair<const Key, T>` must be https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] into the container from any `std::pair` object convertible to it, and it also must be https://en.cppreference.com/w/cpp/named_req/Erasable[Erasable^] from the container.

_T_

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```c++ unordered_flat_map(); ```

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Requires:;; `value_type` is copy constructible

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```c++ unordered_flat_map(unordered_flat_map&& other); ```

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