如何实现多态变参数的求和？

Question

求问下面的Add2这里怎么实现？sum为interface好像没法任意求和？
funcAdd(vars...int)(retint){
varsumint
for_,v:=rangevars{
//fmt.Println("v",v)
sum+=v
}
returnsum
}
//这里怎么实现？sum为interface好像没法任意求和？
funcAdd2(vars...interface{})(retinterface{}){
／*varsuminterface{}
for_,v:=rangevars{
switchv.(type){
caseint:
sum+=v
casefloat64:
sum+=v
casestring:
sum+=v
}
}*／
returnsum
}
funcmain(){
fmt.Println(Add2(1,2))
fmt.Println(Add2(1,2,3))
fmt.Println(Add2(2.4,3.6,1.0))
fmt.Println(Add2("Hello","world","zhong"))
}

Answer 1

你想要的是泛型吧？凑合写了一个，忽略与第一个参数不同类型的值。funcadd(vars...interface{})(retinterface{}){varsuminterface{}for_,v:=rangevars{sum=addTo(sum,v)}returnsum}funcaddTo(suminterface{},vinterface{})(retinterface{}){if(sum==nil){returnv}switchv.(type){caseint:ifintSum,found:=sum.(int);found{returnintSum+v.(int)}casestring:ifstrSum,found:=sum.(string);found{returnstrSum+v.(string)}}returnsum}