英文:
Reuse a function across multiple structs to satisfy an interface
问题
有没有办法在多个结构体之间使用相同的函数来满足接口？
例如：
package main
import "fmt"
type Animal interface {
Speak() string
}
type Dog struct {}
func (d Dog) Speak() string {
return "Woof!"
}
type Wolf struct {}
func (w Wolf) Speak() string {
return "HOWWWWWWWWL"
}
type Beagle struct {}
func (b Beagle) Speak() string {
return "HOWWWWWWWWL"
}
type Cat struct {}
func (c Cat) Speak() string {
return "Meow"
}
func main() {
var a Animal
a = Wolf{}
fmt.Println(a.Speak())
}
因为 Wolf 和 Beagle 共享相同的函数，是否有办法只编写一次该函数，然后在这两个结构体之间共享，以便它们都满足 Animal 接口？
英文:
Is there anyway that you can use the same function across multiple structs to satisfy an interface?
For example:
package main
import "fmt"
type Animal interface {
Speak() string
}
type Dog struct {}
func (d Dog) Speak() string {
return "Woof!"
}
type Wolf struct {}
func (w Wolf) Speak() string {
return "HOWWWWWWWWL"
}
type Beagle struct {}
func (b Beagle) Speak() string {
return "HOWWWWWWWWL"
}
type Cat struct {}
func (c Cat) Speak() string {
return "Meow"
}
func main() {
var a Animal
a = Wolf{}
fmt.Println(a.Speak())
}
Because Wolf and Beagle share the exact same function, is there anyway to write that function once, then share it between the two structs so that they both satisfy Animal?
答案1
得分: 37
你可以创建一个父结构体，该结构体被每个“嚎叫”的动物嵌入。父结构体实现了Speak() string方法，这意味着Wolf和Beagle实现了Animal接口。
package main
import "fmt"
type Animal interface {
Speak() string
}
type Howlers struct {
}
func (h Howlers) Speak() string {
return "HOWWWWWWWWL"
}
type Dog struct {}
func (d Dog) Speak() string {
return "Woof!"
}
type Wolf struct {
Howlers
}
type Beagle struct {
Howlers
}
type Cat struct {}
func (c Cat) Speak() string {
return "Meow"
}
func main() {
var a Animal
a = Wolf{}
fmt.Println(a.Speak())
}
你可以在这里查看代码：https://play.golang.org/p/IMFnWdeweD
英文:
You can create a parent struct that is embedded by each of the animals that "howl". The parent struct implements the Speak() string method, which means Wolf and Beagle implement the Animal interface.
package main
import "fmt"
type Animal interface {
Speak() string
}
type Howlers struct {
}
func (h Howlers) Speak() string {
return "HOWWWWWWWWL"
}
type Dog struct {}
func (d Dog) Speak() string {
return "Woof!"
}
type Wolf struct {
Howlers
}
type Beagle struct {
Howlers
}
type Cat struct {}
func (c Cat) Speak() string {
return "Meow"
}
func main() {
var a Animal
a = Wolf{}
fmt.Println(a.Speak())
}
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