Requires:;; If `x` is the `unordered_set` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.
Requires:;; If要求;; 如果 `x` is the是 `it` 指向的 `unordered_set` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.++_++set` ，则在加载 `x` 与加载 `it` 的时间间隔内，不得对 `x` 执行任何修改操作。
admin
Requires:;; If要求;; 如果 `x`is the是 `it` 指向的 `unordered_set` `it` points to, no modifying operations have been issued on `x` between loading of `x` and loading of `it`.++_++set` ，则在加载 `x` 与加载 `it` 的时间间隔内，不得对 `x` 执行任何修改操作。