go closure2 源码
golang closure2 代码
文件路径：/test/closure2.go
// run
// Copyright 2015 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.
// Check that these do not use "by value" capturing,
// because changes are made to the value during the closure.
package main
var never bool
func main() {
{
type X struct {
v int
}
var x X
func() {
x.v++
}()
if x.v != 1 {
panic("x.v != 1")
}
type Y struct {
X
}
var y Y
func() {
y.v = 1
}()
if y.v != 1 {
panic("y.v != 1")
}
}
{
type Z struct {
a [3]byte
}
var z Z
func() {
i := 0
for z.a[1] = 1; i < 10; i++ {
}
}()
if z.a[1] != 1 {
panic("z.a[1] != 1")
}
}
{
w := 0
tmp := 0
f := func() {
if w != 1 {
panic("w != 1")
}
}
func() {
tmp = w // force capture of w, but do not write to it yet
_ = tmp
func() {
func() {
w++ // write in a nested closure
}()
}()
}()
f()
}
{
var g func() int
for i := range [2]int{} {
if i == 0 {
g = func() int {
return i // test that we capture by ref here, i is mutated on every interaction
}
}
}
if g() != 1 {
panic("g() != 1")
}
}
{
var g func() int
q := 0
for range [2]int{} {
q++
g = func() int {
return q // test that we capture by ref here
// q++ must on a different decldepth than q declaration
}
}
if g() != 2 {
panic("g() != 2")
}
}
{
var g func() int
var a [2]int
q := 0
for a[func() int {
q++
return 0
}()] = range [2]int{} {
g = func() int {
return q // test that we capture by ref here
// q++ must on a different decldepth than q declaration
}
}
if g() != 2 {
panic("g() != 2")
}
}
{
var g func() int
q := 0
q, g = 1, func() int { return q }
if never {
g = func() int { return 2 }
}
if g() != 1 {
panic("g() != 1")
}
}
}
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