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1、类模板,需要使用
template
关键字,然后提供模板参数。模板参数的关键字可以为class
或者typename
。2、声明
T0
,由于 T0 没有在模板参数中给出,所以它只能是函数体内部获得的,然后返回出来,所以函数的返回参数应该设置成auto
。3、使用
std::visit
访问 variant,当需要返回数值时,要指定 lambda 函数的返回值4、
d + c
编译通过,也要设置运算符重载5、Windows 上编译通过