The assignment operator. Copies the contained elements, hash function, predicate and maximum load factor but not the allocator.
The assignment operator. Copies the contained elements, hash function, predicate and maximum load factor but not the allocator.赋值运算符。拷贝所包含的元素、哈希函数、谓词和最大负载因子，但不拷贝分配器。
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The assignment operator. Copies the contained elements, hash function, predicate and maximum load factor but not the allocator.赋值运算符。拷贝所包含的元素、哈希函数、谓词和最大负载因子，但不拷贝分配器。