Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, and `a` as the allocator.
Constructs an empty table with at least `n` buckets, using `hf` as the hash function, `eql` as the key equality predicate, and `a` as the allocator.构造一个拥有至少`n`个桶的空容器，使用`hf`作为哈希函数，`eql`作为键相等谓词，`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, `eql` as the key equality predicate, and `a` as the allocator.构造一个拥有至少`n`个桶的空容器，使用`hf`作为哈希函数，`eql`作为键相等谓词，`a`作为分配器。