mirror of
https://github.com/golang/go
synced 2024-11-12 08:10:21 -07:00
90 lines
1.5 KiB
Go
90 lines
1.5 KiB
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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func caller(f func(int, int) int, a, b int, c chan int) {
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c <- f(a,b)
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}
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func gocall(f func(int, int) int, a, b int) int {
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c := make(chan int);
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go caller(f, a, b, c);
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return <-c;
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}
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func call(f func(int, int) int, a, b int) int {
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return f(a, b)
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}
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func call1(f func(int, int) int, a, b int) int {
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return call(f, a, b)
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}
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var f func(int, int) int
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func add(x, y int) int {
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return x + y
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}
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func fn() (func(int, int) int) {
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return f
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}
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var fc func(int, int, chan int)
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func addc(x, y int, c chan int) {
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c <- x+y
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}
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func fnc() (func(int, int, chan int)) {
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return fc
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}
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func three(x int) {
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if x != 3 {
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panic("wrong val", x)
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}
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}
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var notmain func()
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func emptyresults() () {}
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func noresults() {}
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var nothing func()
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func main() {
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three(call(add, 1, 2));
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three(call1(add, 1, 2));
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f = add;
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three(call(f, 1, 2));
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three(call1(f, 1, 2));
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three(call(fn(), 1, 2));
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three(call1(fn(), 1, 2));
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three(call(func(a,b int) int {return a+b}, 1, 2));
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three(call1(func(a,b int) int {return a+b}, 1, 2));
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fc = addc;
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c := make(chan int);
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go addc(1, 2, c);
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three(<-c);
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go fc(1, 2, c);
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three(<-c);
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go fnc()(1, 2, c);
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three(<-c);
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go func(a, b int, c chan int){c <- a+b}(1, 2, c);
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three(<-c);
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emptyresults();
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noresults();
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nothing = emptyresults;
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nothing();
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nothing = noresults;
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nothing();
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}
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