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// $G $D/$F.go && $L $F.$A && ./$A.out

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

func caller(f func(int, int) int, a, b int, c chan int) {
        c <- f(a, b)
}

func gocall(f func(int, int) int, a, b int) int {
        c := make(chan int)
        go caller(f, a, b, c)
        return <-c
}

func call(f func(int, int) int, a, b int) int {
        return f(a, b)
}

func call1(f func(int, int) int, a, b int) int {
        return call(f, a, b)
}

var f func(int, int) int

func add(x, y int) int {
        return x + y
}

func fn() func(int, int) int {
        return f
}

var fc func(int, int, chan int)

func addc(x, y int, c chan int) {
        c <- x+y
}

func fnc() func(int, int, chan int) {
        return fc
}

func three(x int) {
        if x != 3 {
                println("wrong val", x)
                panic("fail")
        }
}

var notmain func()

func emptyresults() {}
func noresults()    {}

var nothing func()

func main() {
        three(call(add, 1, 2))
        three(call1(add, 1, 2))
        f = add
        three(call(f, 1, 2))
        three(call1(f, 1, 2))
        three(call(fn(), 1, 2))
        three(call1(fn(), 1, 2))
        three(call(func(a, b int) int { return a + b }, 1, 2))
        three(call1(func(a, b int) int { return a + b }, 1, 2))

        fc = addc
        c := make(chan int)
        go addc(1, 2, c)
        three(<-c)
        go fc(1, 2, c)
        three(<-c)
        go fnc()(1, 2, c)
        three(<-c)
        go func(a, b int, c chan int) { c <- a+b }(1, 2, c)
        three(<-c)

        emptyresults()
        noresults()
        nothing = emptyresults
        nothing()
        nothing = noresults
        nothing()
}