Golang--函数签名相同

Golang--函数签名相同

条件

必须函数的函数名，参数和返回值(类型，个数，顺序)都相同。

验证

例子：

定义函数类型，让相同签名的函数自动实现某个接口。

Negtive:

package interfaceTest
import (
	"fmt"
	"testing"
)
type IntString interface {
	test(a int ,s string) (int ,string)
}
type likeIntString func(s string ,i int) (int ,string)
func (i likeIntString) testaaa(ii int, s string) (int, string) {
	return i(s, ii)
}
func TestInterface(t *testing.T){
	var tt IntString = likeIntString(func(s string, i int) (int, string) {
		return i,s
	})
	i, s := tt.testaaa(7, "dfdf")
	fmt.Println(i,s)
}

# Go_test/src/interface/interfaceTest [Go_test/src/interface/interfaceTest.test]

.\interface_test.go:21:6: cannot use likeIntString(func literal) (type likeIntString) as type IntString in assignment:

likeIntString does not implement IntString (missing test method)

.\interface_test.go:25:12: tt.testaaa undefined (type IntString has no field or method testaaa)

Postive

package interfaceTest
import (
	"fmt"
	"testing"
)
type IntString interface {
	test(a int ,s string) (int ,string)
}
type likeIntString func(s string ,i int) (int ,string)
func (i likeIntString) test(ii int, s string) (int, string) {
	return i(s, ii)
}
func TestInterface(t *testing.T){
	var tt IntString = likeIntString(func(s string, i int) (int, string) {
		return i,s
	})
	i, s := tt.test(7, "dfdf")
	fmt.Println(i,s)
}

必须函数签名相同（函数名，参数和返回值(类型，个数，顺序)都相同），否则会转换失败，无法实现该接口。