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.构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数，默认的键相等谓词，并以 `a` 作为分配器。
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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.构造一个至少包含 `n` 个桶的空容器，使用 `hf` 作为哈希函数，默认的键相等谓词，并以 `a` 作为分配器。