-// $G $D/$F.go && $L $F.$A && ./$A.out
+// run
// 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.
+// Test the behavior of closures.
+
package main
-var c = make(chan int);
+import "runtime"
+
+var c = make(chan int)
func check(a []int) {
for i := 0; i < len(a); i++ {
- n := <-c;
+ n := <-c
if n != a[i] {
- panicln("want", a[i], "got", n, "at", i);
+ println("want", a[i], "got", n, "at", i)
+ panic("fail")
}
}
}
func f() {
- var i, j int;
+ var i, j int
- i = 1;
- j = 2;
+ i = 1
+ j = 2
f := func() {
- c <- i;
- i = 4;
+ c <- i
+ i = 4
g := func() {
- c <- i;
- c <- j;
- };
- g();
- c <- i;
- };
- j = 5;
- f();
+ c <- i
+ c <- j
+ }
+ g()
+ c <- i
+ }
+ j = 5
+ f()
}
// Accumulator generator
-func accum(n int) (func(int) int) {
+func accum(n int) func(int) int {
return func(i int) int {
- n += i;
- return n;
+ n += i
+ return n
}
}
func g(a, b func(int) int) {
- c <- a(2);
- c <- b(3);
- c <- a(4);
- c <- b(5);
+ c <- a(2)
+ c <- b(3)
+ c <- a(4)
+ c <- b(5)
}
func h() {
- var x8 byte = 100;
- var x64 int64 = 200;
+ var x8 byte = 100
+ var x64 int64 = 200
- c <- int(x8);
- c <- int(x64);
+ c <- int(x8)
+ c <- int(x64)
f := func(z int) {
g := func() {
- c <- int(x8);
- c <- int(x64);
- c <- z;
- };
- g();
- c <- int(x8);
- c <- int(x64);
- c <- int(z);
- };
- x8 = 101;
- x64 = 201;
- f(500);
+ c <- int(x8)
+ c <- int(x64)
+ c <- z
+ }
+ g()
+ c <- int(x8)
+ c <- int(x64)
+ c <- int(z)
+ }
+ x8 = 101
+ x64 = 201
+ f(500)
}
+func newfunc() func(int) int { return func(x int) int { return x } }
func main() {
- go f();
- check([]int{1,4,5,4});
+ runtime.GOMAXPROCS(1)
+ var fail bool
+
+ go f()
+ check([]int{1, 4, 5, 4})
+
+ a := accum(0)
+ b := accum(1)
+ go g(a, b)
+ check([]int{2, 4, 6, 9})
+
+ go h()
+ check([]int{100, 200, 101, 201, 500, 101, 201, 500})
+
+ memstats := new(runtime.MemStats)
+ runtime.ReadMemStats(memstats)
+ n0 := memstats.Mallocs
- a := accum(0);
- b := accum(1);
- go g(a, b);
- check([]int{2,4,6,9});
+ x, y := newfunc(), newfunc()
+ if x(1) != 1 || y(2) != 2 {
+ println("newfunc returned broken funcs")
+ fail = true
+ }
+
+ runtime.ReadMemStats(memstats)
+ if n0 != memstats.Mallocs {
+ println("newfunc allocated unexpectedly")
+ fail = true
+ }
+
+ ff(1)
+
+ if fail {
+ panic("fail")
+ }
+}
+
+func ff(x int) {
+ call(func() {
+ _ = x
+ })
+}
- go h();
- check([]int{100,200,101,201,500,101,201,500});
+func call(func()) {
}