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Flags
safe-html, strict-same
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Inserts an element constructed from `k` and `args` into the table if there is no existing element with key `k` contained within it, and then invokes `f1` with a non-const reference to the newly created element. Otherwise, invokes `f2` with a reference to the equivalent element; such reference is const iff a `*_cvisit` overload is used.若表中不存在键为`k`的元素,则将由`k`和`args`构造的元素插入表中,随后以非常量引用指向新创建的元素并调用`f1`。否则,以指向等价元素的引用调用`f2`;当且仅当使用`*_cvisit`重载版本时,该引用为常量引用。