return c
}
+const alphabet = "abcdefghijklmnopqrstuvwxyz"
+
+func testblankvars() {
+ n := 0
+ for range alphabet {
+ n++
+ }
+ if n != 26 {
+ println("for range: wrong count", n, "want 26")
+ panic("fail")
+ }
+ n = 0
+ for _ = range alphabet {
+ n++
+ }
+ if n != 26 {
+ println("for _ = range: wrong count", n, "want 26")
+ panic("fail")
+ }
+ n = 0
+ for _, _ = range alphabet {
+ n++
+ }
+ if n != 26 {
+ println("for _, _ = range: wrong count", n, "want 26")
+ panic("fail")
+ }
+ s := 0
+ for i, _ := range alphabet {
+ s += i
+ }
+ if s != 325 {
+ println("for i, _ := range: wrong sum", s, "want 325")
+ panic("fail")
+ }
+ r := rune(0)
+ for _, v := range alphabet {
+ r += v
+ }
+ if r != 2847 {
+ println("for _, v := range: wrong sum", r, "want 2847")
+ panic("fail")
+ }
+}
+
func testchan() {
s := ""
for i := range seq('a', 'z') {
s += string(i)
}
- if s != "abcdefghijklmnopqrstuvwxyz" {
+ if s != alphabet {
println("Wanted lowercase alphabet; got", s)
panic("fail")
}
+ n := 0
+ for range seq('a', 'z') {
+ n++
+ }
+ if n != 26 {
+ println("testchan wrong count", n, "want 26")
+ panic("fail")
+ }
}
// test that range over slice only evaluates
}
}
+func testslice2() {
+ n := 0
+ nmake = 0
+ for range makeslice() {
+ n++
+ }
+ if nmake != 1 {
+ println("range called makeslice", nmake, "times")
+ panic("fail")
+ }
+ if n != 5 {
+ println("wrong count ranging over makeslice", n)
+ panic("fail")
+ }
+}
+
+// test that range over []byte(string) only evaluates
+// the expression after "range" once.
+
+func makenumstring() string {
+ nmake++
+ return "\x01\x02\x03\x04\x05"
+}
+
+func testslice3() {
+ s := byte(0)
+ nmake = 0
+ for _, v := range []byte(makenumstring()) {
+ s += v
+ }
+ if nmake != 1 {
+ println("range called makenumstring", nmake, "times")
+ panic("fail")
+ }
+ if s != 15 {
+ println("wrong sum ranging over []byte(makenumstring)", s)
+ panic("fail")
+ }
+}
+
// test that range over array only evaluates
// the expression after "range" once.
}
}
+func testarray2() {
+ n := 0
+ nmake = 0
+ for range makearray() {
+ n++
+ }
+ if nmake != 1 {
+ println("range called makearray", nmake, "times")
+ panic("fail")
+ }
+ if n != 5 {
+ println("wrong count ranging over makearray", n)
+ panic("fail")
+ }
+}
+
func makearrayptr() *[5]int {
nmake++
return &[5]int{1, 2, 3, 4, 5}
}
}
+func testarrayptr2() {
+ n := 0
+ nmake = 0
+ for range makearrayptr() {
+ n++
+ }
+ if nmake != 1 {
+ println("range called makearrayptr", nmake, "times")
+ panic("fail")
+ }
+ if n != 5 {
+ println("wrong count ranging over makearrayptr", n)
+ panic("fail")
+ }
+}
+
// test that range over string only evaluates
// the expression after "range" once.
println("wrong sum ranging over makestring", s)
panic("fail")
}
+
+ x := []rune{'a', 'b'}
+ i := 1
+ for i, x[i] = range "c" {
+ break
+ }
+ if i != 0 || x[0] != 'a' || x[1] != 'c' {
+ println("wrong parallel assignment", i, x[0], x[1])
+ panic("fail")
+ }
+
+ y := []int{1, 2, 3}
+ r := rune(1)
+ for y[r], r = range "\x02" {
+ break
+ }
+ if r != 2 || y[0] != 1 || y[1] != 0 || y[2] != 3 {
+ println("wrong parallel assignment", r, y[0], y[1], y[2])
+ panic("fail")
+ }
}
func teststring1() {
}
}
+func teststring2() {
+ n := 0
+ nmake = 0
+ for range makestring() {
+ n++
+ }
+ if nmake != 1 {
+ println("range called makestring", nmake, "times")
+ panic("fail")
+ }
+ if n != 5 {
+ println("wrong count ranging over makestring", n)
+ panic("fail")
+ }
+}
+
// test that range over map only evaluates
// the expression after "range" once.
}
}
+func testmap2() {
+ n := 0
+ nmake = 0
+ for range makemap() {
+ n++
+ }
+ if nmake != 1 {
+ println("range called makemap", nmake, "times")
+ panic("fail")
+ }
+ if n != 5 {
+ println("wrong count ranging over makemap", n)
+ panic("fail")
+ }
+}
+
// test that range evaluates the index and value expressions
// exactly once per iteration.
}
func main() {
+ testblankvars()
testchan()
testarray()
testarray1()
+ testarray2()
testarrayptr()
testarrayptr1()
+ testarrayptr2()
testslice()
testslice1()
+ testslice2()
+ testslice3()
teststring()
teststring1()
+ teststring2()
testmap()
testmap1()
+ testmap2()
testcalls()
}