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 `allocator_type()` as the allocator.构造一个空容器，使用`hasher()`作为哈希函数，`key_equal()`作为键相等谓词，`allocator_type()`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 `allocator_type()` as the allocator.构造一个空容器，使用`hasher()`作为哈希函数，`key_equal()`作为键相等谓词，`allocator_type()`作为分配器。