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Key
:814Flags
safe-html, strict-same
Requires:;;要求:`value_type`is可以从 `k` 进行 https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] from `k`. Returns:;; The bool component of the return type is true if an insert took place. + + If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load to be greater than the maximum load. + + This overload only participates in overload resolution if可原位构造^]。返回:如果发生了插入,则返回类型的 bool 分量为 true。
如果发生了插入,则迭代器指向新插入的元素;否则,指向具有等价键的元素。
抛出:如果除调用 `hasher` 之外的操作抛出异常,则该函数无效果。
注意:可能使迭代器失效,但仅当插入导致负载大于最大负载时才会发生。
只有当 `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,此重载才会参与重载决议。库假定 `Hash` 可同时用 `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,并且 `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。