Constructs an empty container with at least `n` buckets, using `hf` as the hash function, the default key equality predicate and `a` as the allocator.
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, the default key equality predicate and `a` as the allocator.unordered_flat_map(size_type n, hasher const& hf, allocator_type const& a);
admin
Constructs an empty container with at least `n` buckets, using `hf` as the hash function, the default key equality predicate and `a` as the allocator.unordered_flat_map(size_type n, hasher const& hf, allocator_type const& a);