3 // Copyright 2009 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
7 // Test the 'for range' construct.
11 // test range over channels
13 func gen(c chan int, lo, hi int) {
14 for i := lo; i <= hi; i++ {
20 func seq(lo, hi int) chan int {
26 const alphabet = "abcdefghijklmnopqrstuvwxyz"
28 func testblankvars() {
34 println("for range: wrong count", n, "want 26")
38 for _ = range alphabet {
42 println("for _ = range: wrong count", n, "want 26")
46 for _, _ = range alphabet {
50 println("for _, _ = range: wrong count", n, "want 26")
54 for i, _ := range alphabet {
58 println("for i, _ := range: wrong sum", s, "want 325")
62 for _, v := range alphabet {
66 println("for _, v := range: wrong sum", r, "want 2847")
73 for i := range seq('a', 'z') {
77 println("Wanted lowercase alphabet; got", s)
81 for range seq('a', 'z') {
85 println("testchan wrong count", n, "want 26")
90 // test that range over slice only evaluates
91 // the expression after "range" once.
95 func makeslice() []int {
97 return []int{1, 2, 3, 4, 5}
103 for _, v := range makeslice() {
107 println("range called makeslice", nmake, "times")
111 println("wrong sum ranging over makeslice", s)
118 for i, x[i] = range y {
121 if i != 0 || x[0] != 10 || x[1] != 99 {
122 println("wrong parallel assignment", i, x[0], x[1])
130 for i := range makeslice() {
134 println("range called makeslice", nmake, "times")
138 println("wrong sum ranging over makeslice", s)
146 for range makeslice() {
150 println("range called makeslice", nmake, "times")
154 println("wrong count ranging over makeslice", n)
159 // test that range over []byte(string) only evaluates
160 // the expression after "range" once.
162 func makenumstring() string {
164 return "\x01\x02\x03\x04\x05"
170 for _, v := range []byte(makenumstring()) {
174 println("range called makenumstring", nmake, "times")
178 println("wrong sum ranging over []byte(makenumstring)", s)
183 // test that range over array only evaluates
184 // the expression after "range" once.
186 func makearray() [5]int {
188 return [5]int{1, 2, 3, 4, 5}
194 for _, v := range makearray() {
198 println("range called makearray", nmake, "times")
202 println("wrong sum ranging over makearray", s)
210 for i := range makearray() {
214 println("range called makearray", nmake, "times")
218 println("wrong sum ranging over makearray", s)
226 for range makearray() {
230 println("range called makearray", nmake, "times")
234 println("wrong count ranging over makearray", n)
239 func makearrayptr() *[5]int {
241 return &[5]int{1, 2, 3, 4, 5}
244 func testarrayptr() {
246 x := len(makearrayptr())
247 if x != 5 || nmake != 1 {
248 println("len called makearrayptr", nmake, "times and got len", x)
252 x = cap(makearrayptr())
253 if x != 5 || nmake != 1 {
254 println("cap called makearrayptr", nmake, "times and got len", x)
259 for _, v := range makearrayptr() {
263 println("range called makearrayptr", nmake, "times")
267 println("wrong sum ranging over makearrayptr", s)
272 func testarrayptr1() {
275 for i := range makearrayptr() {
279 println("range called makearrayptr", nmake, "times")
283 println("wrong sum ranging over makearrayptr", s)
288 func testarrayptr2() {
291 for range makearrayptr() {
295 println("range called makearrayptr", nmake, "times")
299 println("wrong count ranging over makearrayptr", n)
304 // test that range over string only evaluates
305 // the expression after "range" once.
307 func makestring() string {
315 for _, v := range makestring() {
319 println("range called makestring", nmake, "times")
322 if s != 'a'+'b'+'c'+'d'+'☺' {
323 println("wrong sum ranging over makestring", s)
327 x := []rune{'a', 'b'}
329 for i, x[i] = range "c" {
332 if i != 0 || x[0] != 'a' || x[1] != 'c' {
333 println("wrong parallel assignment", i, x[0], x[1])
339 for y[r], r = range "\x02" {
342 if r != 2 || y[0] != 1 || y[1] != 0 || y[2] != 3 {
343 println("wrong parallel assignment", r, y[0], y[1], y[2])
351 for i := range makestring() {
355 println("range called makestring", nmake, "times")
359 println("wrong sum ranging over makestring", s)
367 for range makestring() {
371 println("range called makestring", nmake, "times")
375 println("wrong count ranging over makestring", n)
380 // test that range over map only evaluates
381 // the expression after "range" once.
383 func makemap() map[int]int {
385 return map[int]int{0: 'a', 1: 'b', 2: 'c', 3: 'd', 4: '☺'}
391 for _, v := range makemap() {
395 println("range called makemap", nmake, "times")
398 if s != 'a'+'b'+'c'+'d'+'☺' {
399 println("wrong sum ranging over makemap", s)
407 for i := range makemap() {
411 println("range called makemap", nmake, "times")
415 println("wrong sum ranging over makemap", s)
423 for range makemap() {
427 println("range called makemap", nmake, "times")
431 println("wrong count ranging over makemap", n)
436 // test that range evaluates the index and value expressions
437 // exactly once per iteration.
441 func getvar(p *int) *int {
450 for *getvar(&i), *getvar(&v) = range [2]int{1, 2} {
455 println("wrong number of calls:", ncalls, "!= 4")
458 if si != 1 || sv != 3 {
459 println("wrong sum in testcalls", si, sv)
464 for *getvar(&i), *getvar(&v) = range [0]int{} {
465 println("loop ran on empty array")
469 println("wrong number of calls:", ncalls, "!= 0")