Constructs an empty table with at least `n` buckets, using `hf` as the hash function, the default key equality predicate and `a` as the allocator.
Constructs an empty table 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 个桶的空表，使用 hf 作为哈希函数、默认键相等谓词，并以 a 作为分配器。
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Constructs an empty table 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 个桶的空表，使用 hf 作为哈希函数、默认键相等谓词，并以 a 作为分配器。