[go-nuts] I see golang net/http code, i imitate it, but i can't.

[Neng Kong]

i see this:

type HandlerFunc func(ResponseWriter, *Request)

// ServeHTTP calls f(w, r).
func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request) {
    f(w, r)
}


and i imitate it, but can't compile:
package main

import "fmt"

type Handler interface {
    Call(x, y int)
}
func Add(x, y int) {
    fmt.Println(x+y)
}
type HandlerFunc func(x, y int)

func (f HandlerFunc) Call(x, y int) {
    f(x, y) 
}
func main() {
    demo := HandlerFunc{}
    var i Handler
    i = demo
    i.Call(1, 2)
}

[john@localhost gweb]$ go run demo.go
# command-line-arguments
./inspiration_by_golang_http.go:17: invalid type for composite literal: 
HandlerFunc



i do not understand it, this is way ?

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