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Throws:;; If an exception is thrown by an operation other than a call to `hasher` or call to `f1` or `f2`, 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,插入关联元素,并以新插入元素的非常量引用为参数调用 `f1` ;否则,以等价元素的引用为参数调用 `f2` ;当且仅当使用 `insert++_++or++_++cvisit` (此处应为 `insert++_++and++_++cvisit` ,可能是英文出了点错误)时该引用为常量引用。