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assert.go
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/
assert.go
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package main
import "fmt"
func main() {
/*
接口断言
一
1.instance := 接口对象.(实际类型) //不安全
2.instance,ok :=接口对象.(实际类型)
二 switch
switch instance :=接口对象.(type){
case 实际类型1:
case 实际类型2:
...
}
*/
c := cat2{"tom"}
c.eat()
allAnimalEat(c)
allAnimalEat2(c)
}
type animal2 interface {
eat()
}
type cat2 struct {
name string
}
type dog2 struct {
name string
}
func (c cat2) eat() {
fmt.Println(c, " eat fish")
}
func (d dog2) eat() {
fmt.Println(d, " eat meat")
}
func allAnimalEat(a2 animal2) {
if ins, ok := a2.(cat2); ok {
fmt.Println(ins)
a2.eat()
} else if ins, ok := a2.(dog2); ok {
fmt.Println(ins)
a2.eat()
} else {
fmt.Println("unkown")
}
}
func allAnimalEat2(a2 animal2) {
switch ins := a2.(type) {
case cat2:
fmt.Println(ins, " is a cat")
case dog2:
fmt.Println(ins, " is a dog")
}
}