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048-checkInterface.go
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048-checkInterface.go
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package main
import (
"fmt"
)
type Checker interface {
Check() bool
}
type P struct{}
func (p *P) Check() bool {
return true
}
type V struct{}
func (v V) Check() bool {
return true
}
type N struct{}
func main() {
var pp interface{} = &P{}
if _, ok := pp.(Checker); ok {
fmt.Println("*P implements the checker interface")
} else {
fmt.Println("*P does not implement the checker interface")
}
var pv interface{} = P{}
if _, ok := pv.(Checker); ok {
fmt.Println("P implements the checker interface")
} else {
fmt.Println("P does not implement the checker interface")
}
var vp interface{} = &V{}
if _, ok := vp.(Checker); ok {
fmt.Println("*V implements the checker interface")
} else {
fmt.Println("*V does not implement the checker interface")
}
// V implements the Checker interface using value receiver
// so V satisfies the interface
var vv interface{} = V{}
if _, ok := vv.(Checker); ok {
fmt.Println("V implements the checker interface")
} else {
fmt.Println("V does not implement the checker interface")
}
// N does not implement the Checker interface at all
// so *N does not satisfy the interface
var np interface{} = &N{}
if _, ok := np.(Checker); ok {
fmt.Println("*N implements the checker interface")
} else {
fmt.Println("*N does not implement the checker interface")
}
// N does not implement the Checker interface at all
// so N does not satisfy the interface
var nv interface{} = N{}
if _, ok := nv.(Checker); ok {
fmt.Println("N implements the checker interface")
} else {
fmt.Println("N does not implement the checker interface")
}
}