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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
// test range over channels
func gen(c chan int, lo, hi int) {
for i := lo; i <= hi; i++ {
c <- i;
}
close(c);
}
func seq(lo, hi int) chan int {
c := make(chan int);
go gen(c, lo, hi);
return c;
}
func testchan() {
s := "";
for i := range seq('a', 'z') {
s += string(i);
}
if s != "abcdefghijklmnopqrstuvwxyz" {
panicln("Wanted lowercase alphabet; got", s);
}
}
// test that range over array only evaluates
// the expression after "range" once.
var nmake = 0;
func makearray() []int {
nmake++;
return []int{1,2,3,4,5};
}
func testarray() {
s := 0;
for k, v := range makearray() {
s += v;
}
if nmake != 1 {
panicln("range called makearray", nmake, "times");
}
if s != 15 {
panicln("wrong sum ranging over makearray");
}
}
func main() {
testchan();
testarray();
}
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