go closure 源码
golang closure 代码
文件路径：/test/closure.go
// 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
import "runtime"
var c = make(chan int)
func check(a []int) {
for i := 0; i < len(a); i++ {
n := <-c
if n != a[i] {
println("want", a[i], "got", n, "at", i)
panic("fail")
}
}
}
func f() {
var i, j int
i = 1
j = 2
f := func() {
c <- i
i = 4
g := func() {
c <- i
c <- j
}
g()
c <- i
}
j = 5
f()
}
// Accumulator generator
func accum(n int) func(int) int {
return func(i int) int {
n += i
return n
}
}
func g(a, b func(int) int) {
c <- a(2)
c <- b(3)
c <- a(4)
c <- b(5)
}
func h() {
var x8 byte = 100
var x64 int64 = 200
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)
}
func newfunc() func(int) int { return func(x int) int { return x } }
func main() {
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
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
})
}
func call(func()) {
}
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