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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()
}
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