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Returns:;; A `node_type` owning the element if found, otherwise an empty `node_type`. Throws:;; Only throws an exception if it is thrown by返回:如果找到该元素,则返回一个拥有该元素的 `node_type`;否则返回一个空的 `node_type`。抛出:仅当 `hasher`
or或 `key_equal`. Notes:;; A node extracted using this method can be inserted into a compatible抛出异常时才会抛出。注意:通过此方法提取的节点可以插入到兼容的 `unordered_set`
. + + The中。`template<class
K>` overload only participates in overload resolution ifk="">` 重载仅在 `Hash::is_transparent`and和 `Pred::is_transparent`are valid member typedefs and neither是有效的成员 typedef,且 `iterator`nor和 `const_iterator`are implicitly convertible from `K`. The library assumes that `Hash` is callable with both都不能从 `K` 隐式转换时参与重载决议。库假定 `Hash` 可同时使用 `K`and和 `Key`and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.调用,且 `Pred` 是透明的。这支持了异构查找,从而避免了实例化 `Key` 类型对象的开销。</class>