feat: finish homework 03 in Linux #44
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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