提问人：arturfil 提问时间：6/10/2023 更新时间：6/10/2023 访问量：24
如何创建一个方法，什么需要一个泛型切片，其中 X 型结构的切片具有共享泛型字段
How to create a method what takes a generic slice where that slice of type X struct has a shared generic field
问：
我有两个结构体和我的函数，它以 X 类型的切片作为参数，返回给定切片的总量
type Food struct {
name string
price float64
}
type Cloth {
name string
price int
}
func AddItemsAlt[T Cloth | Food](objects []T, getUnit func(obj T) float64) float64 {
sum := 0.0
for _, obj := range objects {
sum += getUnit(obj)
}
return sum
}
func main() {
var check = []Food {{"Pizza", 6.23}, {"Hamburgesa", 7.99}, {"Tacos", 4.34}}
var cart = []Cloth {{"Player", 6}, {"Pants", 8}, {"Tacos de Futbol", 10}}
check := AddItems(cart, func(obj Food) float64 {
return obj.price
})
}
我会尝试这个，它会给我一个错误，因为该函数没有考虑到 Cloth 可能将字段作为 int 类型这一事实。
答：
0赞
arturfil
6/10/2023
#1
我继续更新我的答案，添加两个接口并将这些接口放入功能中
type Food struct {
name string
price float64
}
type Cloth {
name string
price int
}
type Amount interface {
int | float64
}
type Item interface {
Cloth | Food
}
func AddItemsAlt[T Item, A Amount](objects []T, getUnit func(obj T) A) A {
sum := A(0)
for _, obj := range objects {
sum += getUnit(obj)
}
return sum
}
func main() {
var check = []Food {{"Pizza", 6.23}, {"Hamburgesa", 7.99}, {"Tacos", 4.34}}
var cart = []Cloth {{"Player", 6}, {"Pants", 8}, {"Tacos de Futbol", 10}}
check := AddItems(check, func(obj Food) float64 {
return obj.price
})
cartTotal := AddItems(cart, func(obj Cloth) int {
return obj.price
})
fmt.Printf("The total for the shopping cart is:\t%v\n", cartTotal)
fmt.Printf("The total for the check is:\t%.4f\n", check)
}
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