bsl::unordered_map::operator=

Assign to this object the value, hash function, and key‐equality comparator of the specified rhs object, propagate to this object the allocator of rhs if the ALLOCATOR type has trait propagate_on_container_move_assignment, and return a reference providing modifiable access to this object. The contents of rhs are moved (in constant time) to this unordered map if get_allocator() == rhs.get_allocator() (after accounting for the aforementioned trait); otherwise, all elements in this container are either destroyed or move‐assigned to, and each additional element in rhs is move‐inserted into this unordered_map. rhs is left in a valid but unspecified state, and if an exception is thrown, *this is left in a valid but unspecified state. This method requires that the type value_type be move‐constructible (see {Requirements on value_type}).