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equivalent to conversion of the object stored inside of optional. |The result is default constructed if the input value is `null`. Otherwise the result is constructed from the result of conversion of the input to the type stored in optional.等同于将存储在可选对象内部的对象进行转换。| 如果输入值为 `null` ,则结果将默认进行构造。否则,结果将根据将输入转换为存储在可选对象中的类型所得到的结果进行构造。