Go は関数呼び出しをパラメーターとして使用する型として直接表現できますか?

<code class="go">func myFunc() {
    fmt.Println("hi")
}

func main() {
    var f func()
    f = myFunc
    f() // This calls the function value stored in f: myFunc in this example
}</code>

<code class="go">func launch(f func()) {
    fmt.Println("Before launch")
    go func() {
        defer fmt.Println("After completion")
        f()
    }()
}</code>

<code class="go">func main() {
    launch(func() {
        fmt.Println("Hello, playground")
    })

    time.Sleep(time.Second)
}</code>

Before launch
Hello, playground
After completion

<code class="go">func wrapPrintln(s string) func() {
    return func() {
        fmt.Println(s)
    }
}</code>

<code class="go">launch(wrapPrintln(s))</code>

<code class="go">func launch(f interface{}, params ...interface{}) {
    fmt.Println("Before launch")
    go func() {
        defer fmt.Println("After completion")
        pv := make([]reflect.Value, len(params))
        for i, v := range params {
            pv[i] = reflect.ValueOf(v)
        }
        reflect.ValueOf(f).Call(pv)
    }()
}</code>

<code class="go">func main() {
    i, s := 1, "Hello, playground"

    launch(fmt.Printf, "%d %q\n", i, s)
    i, s = 2, "changed"

    time.Sleep(time.Second)
}</code>

Before launch
1 "Hello, playground"
After completion