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![Cuong Manh Le](/assets/img/avatar_default.png)
Fixed #64930 Change-Id: I916de7f97116fb20cb2f3f0b425ac34409afd494 Reviewed-on: https://go-review.googlesource.com/c/go/+/553436 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com> Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
352 lines
5.1 KiB
Go
352 lines
5.1 KiB
Go
// run -goexperiment rangefunc
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// Copyright 2023 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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// Test the 'for range' construct ranging over functions.
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package main
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var gj int
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func yield4x(yield func() bool) {
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_ = yield() && yield() && yield() && yield()
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}
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func yield4(yield func(int) bool) {
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_ = yield(1) && yield(2) && yield(3) && yield(4)
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}
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func yield3(yield func(int) bool) {
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_ = yield(1) && yield(2) && yield(3)
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}
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func yield2(yield func(int) bool) {
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_ = yield(1) && yield(2)
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}
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func testfunc0() {
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j := 0
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for range yield4x {
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j++
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}
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if j != 4 {
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println("wrong count ranging over yield4x:", j)
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panic("testfunc0")
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}
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j = 0
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for _ = range yield4 {
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j++
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}
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if j != 4 {
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println("wrong count ranging over yield4:", j)
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panic("testfunc0")
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}
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}
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func testfunc1() {
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bad := false
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j := 1
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for i := range yield4 {
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if i != j {
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println("range var", i, "want", j)
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bad = true
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}
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j++
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}
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if j != 5 {
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println("wrong count ranging over f:", j)
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bad = true
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}
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if bad {
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panic("testfunc1")
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}
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}
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func testfunc2() {
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bad := false
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j := 1
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var i int
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for i = range yield4 {
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if i != j {
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println("range var", i, "want", j)
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bad = true
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}
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j++
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}
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if j != 5 {
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println("wrong count ranging over f:", j)
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bad = true
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}
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if i != 4 {
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println("wrong final i ranging over f:", i)
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bad = true
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}
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if bad {
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panic("testfunc2")
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}
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}
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func testfunc3() {
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bad := false
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j := 1
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var i int
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for i = range yield4 {
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if i != j {
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println("range var", i, "want", j)
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bad = true
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}
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j++
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if i == 2 {
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break
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}
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continue
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}
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if j != 3 {
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println("wrong count ranging over f:", j)
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bad = true
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}
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if i != 2 {
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println("wrong final i ranging over f:", i)
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bad = true
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}
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if bad {
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panic("testfunc3")
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}
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}
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func testfunc4() {
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bad := false
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j := 1
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var i int
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func() {
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for i = range yield4 {
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if i != j {
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println("range var", i, "want", j)
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bad = true
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}
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j++
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if i == 2 {
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return
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}
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}
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}()
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if j != 3 {
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println("wrong count ranging over f:", j)
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bad = true
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}
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if i != 2 {
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println("wrong final i ranging over f:", i)
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bad = true
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}
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if bad {
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panic("testfunc3")
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}
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}
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func func5() (int, int) {
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for i := range yield4 {
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return 10, i
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}
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panic("still here")
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}
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func testfunc5() {
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x, y := func5()
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if x != 10 || y != 1 {
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println("wrong results", x, y, "want", 10, 1)
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panic("testfunc5")
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}
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}
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func func6() (z, w int) {
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for i := range yield4 {
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z = 10
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w = i
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return
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}
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panic("still here")
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}
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func testfunc6() {
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x, y := func6()
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if x != 10 || y != 1 {
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println("wrong results", x, y, "want", 10, 1)
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panic("testfunc6")
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}
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}
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var saved []int
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func save(x int) {
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saved = append(saved, x)
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}
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func printslice(s []int) {
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print("[")
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for i, x := range s {
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if i > 0 {
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print(", ")
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}
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print(x)
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}
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print("]")
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}
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func eqslice(s, t []int) bool {
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if len(s) != len(t) {
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return false
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}
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for i, x := range s {
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if x != t[i] {
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return false
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}
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}
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return true
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}
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func func7() {
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defer save(-1)
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for i := range yield4 {
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defer save(i)
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}
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defer save(5)
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}
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func checkslice(name string, saved, want []int) {
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if !eqslice(saved, want) {
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print("wrong results ")
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printslice(saved)
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print(" want ")
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printslice(want)
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print("\n")
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panic(name)
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}
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}
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func testfunc7() {
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saved = nil
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func7()
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want := []int{5, 4, 3, 2, 1, -1}
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checkslice("testfunc7", saved, want)
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}
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func func8() {
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defer save(-1)
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for i := range yield2 {
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for j := range yield3 {
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defer save(i*10 + j)
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}
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defer save(i)
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}
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defer save(-2)
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for i := range yield4 {
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defer save(i)
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}
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defer save(-3)
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}
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func testfunc8() {
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saved = nil
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func8()
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want := []int{-3, 4, 3, 2, 1, -2, 2, 23, 22, 21, 1, 13, 12, 11, -1}
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checkslice("testfunc8", saved, want)
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}
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func func9() {
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n := 0
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for _ = range yield2 {
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for _ = range yield3 {
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n++
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defer save(n)
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}
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}
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}
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func testfunc9() {
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saved = nil
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func9()
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want := []int{6, 5, 4, 3, 2, 1}
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checkslice("testfunc9", saved, want)
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}
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// test that range evaluates the index and value expressions
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// exactly once per iteration.
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var ncalls = 0
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func getvar(p *int) *int {
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ncalls++
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return p
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}
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func iter2(list ...int) func(func(int, int) bool) {
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return func(yield func(int, int) bool) {
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for i, x := range list {
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if !yield(i, x) {
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return
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}
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}
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}
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}
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func testcalls() {
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var i, v int
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ncalls = 0
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si := 0
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sv := 0
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for *getvar(&i), *getvar(&v) = range iter2(1, 2) {
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si += i
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sv += v
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}
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if ncalls != 4 {
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println("wrong number of calls:", ncalls, "!= 4")
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panic("fail")
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}
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if si != 1 || sv != 3 {
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println("wrong sum in testcalls", si, sv)
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panic("fail")
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}
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}
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type iter3YieldFunc func(int, int) bool
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func iter3(list ...int) func(iter3YieldFunc) {
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return func(yield iter3YieldFunc) {
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for k, v := range list {
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if !yield(k, v) {
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return
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}
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}
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}
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}
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func testcalls1() {
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ncalls := 0
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for k, v := range iter3(1, 2, 3) {
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_, _ = k, v
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ncalls++
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}
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if ncalls != 3 {
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println("wrong number of calls:", ncalls, "!= 3")
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panic("fail")
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}
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}
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func main() {
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testfunc0()
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testfunc1()
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testfunc2()
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testfunc3()
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testfunc4()
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testfunc5()
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testfunc6()
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testfunc7()
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testfunc8()
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testfunc9()
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testcalls()
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testcalls1()
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}
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