Constructs an empty table using `hasher()` as the hash function, `key_equal()` as the key equality predicate and `allocator_type()` as the allocator.
Constructs an empty table using `hasher()` as the hash function, `key_equal()` as the key equality predicate and构造一个空哈希表，使用 `hasher()` 作为哈希函数，`key_equal()` 作为键相等谓词，`allocator_type()` as the allocator.作为分配器。
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Constructs an empty table using `hasher()` as the hash function, `key_equal()` as the key equality predicate and构造一个空哈希表，使用 `hasher()` 作为哈希函数，`key_equal()` 作为键相等谓词，`allocator_type()`as the allocator.作为分配器。