英文:
Re-assigning methods in Go
问题
假设我有以下代码：
package mainimport "fmt"type I1 interface {m1()}func f1() {fmt.Println("dosomething")}func main() {var obj I1obj.m1 = f1obj.m1()}
这会生成错误：
./empty.go:16: cannot assign to obj.m1
为什么我不能赋值给"方法字段"？
在C语言中，我可以传递函数指针。在Go语言中有什么等效的方法吗？
英文:
Suppose I have the following:
package mainimport "fmt"type I1 interface {m1()}func f1() {fmt.Println("dosomething")}func main() {var obj I1obj.m1 = f1obj.m1()}
This generates the error
./empty.go:16: cannot assign to obj.m1
Why can't I assign to 'method fields'?
In C, I can just pass around function pointers. What is the equivalent in Go?
答案1
得分: 2
你不能将函数分配给接口，但可以将其分配给结构体，例如：
type S1 struct {m1 func()}func f1() {fmt.Println("dosomething")}func main() {var obj S1obj.m1 = f1obj.m1()}
// 另一个例子
type I1 interface {m1()}type S1 struct {}func (S1) m1() {fmt.Println("dosomething")}type S2 struct { S1 }func (s S2) m1() {fmt.Println("dosomething-2")//s.S1.m1() //取消注释以调用原始的m1。}func doI1(i I1) {i.m1()}func main() {doI1(S1{})doI1(S2{S1{}})}
英文:
You can't assign a function to an interface, you can do it for a struct, for example:
type S1 struct {m1 func()}func f1() {fmt.Println("dosomething")}func main() {var obj S1obj.m1 = f1obj.m1()}
// another example
type I1 interface {m1()}type S1 struct {}func (S1) m1() {fmt.Println("dosomething")}type S2 struct { S1 }func (s S2) m1() {fmt.Println("dosomething-2")//s.S1.m1() //uncomment to call the original m1.}func doI1(i I1) {i.m1()}func main() {doI1(S1{})doI1(S2{S1{}})}
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