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1，缺少了模板声明
2，T0不需要声明，首先需要知道T1+T2的类型，用了decltype来得到对应类型的别名，逐个元素相加后返回
3，使用visit访问对应类型的variant值，相加后申明为对应类型的variant并返回
4，由于缺少variant类型与普通类型相加的操作符重载，所以额外增加了一个函数
5，使用了可变长操作符支持多参数，并使用visit访问对应类型变量并输出