hw03 #37
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hw03 #37
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std::variant 类似于 union，可以存储范围内的一种类型的值。
在使用时，需要判断 variant 存了哪种类型的值，可以使用
index、holds_alternative更简单的方法是使用
std::visit，visit 会自动用相应的类型调用 lambdavisit 中的 lambda 可以有多个 variant 的参数，而且 lambda 还可以有返回值，可以进一步简化代码