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1,补充模板定义
2,使用decltype(aoto)自动推导函数返回值
3,使用using定义相加结果的类型
4,通过std::visit自动匹配lambda中的类型
5,重载+号,利用强制转换匹配d+c
这个练习重温了课堂上模板与几个容器的结合运用。