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Throws:;; If an exception is thrown by an operation other than a call to `hasher` or call to `f`, the function has no effect. Concurrency:;; Blocking on rehashing of `*this`. Notes:;; Behavior is undefined if `nh` is not empty and the allocators of `nh` and the container are not equal.若 `nh` 为空,则不执行任何操作。否则,当且仅当容器中不存在键等价于 `nh.key()` 的元素时,插入其关联的元素;否则,以等价元素的引用为参数调用 `f` ;当且仅当使用 `insert++_++or++_++cvisit` 时该引用为常量引用。