<5> go 上下文传递context

来源：互联网发布：折800淘宝女装编辑：程序博客网时间：2024/05/23 20:51

有go有channal，slick，map，interface，func等等，其中func可以当作参数传递的这个功能也是很多动态语言支持的。
现在看下怎么使用

import (    "fmt")type Do struct {    Name string}func (this Do) Lock() {    fmt.Println(this.Name + " Lock ...")}func (this Do) UnLock() {    fmt.Println(this.Name + " Unlock ~")}// 假设需要做加锁解锁func Say() {    do := Do{Name: "Say"}    do.Lock()    defer do.UnLock()    fmt.Println("say doing")}// 假设需要做加锁解锁func Fuck() {    do := Do{Name: "Fuck"}    do.Lock()    defer do.UnLock()    fmt.Println("fuck doing")}// 改造 －withContextfunc withDoContext(fn func()) {    do := Do{Name: "do"}    do.Lock()    defer do.UnLock()    fn()}func Quit() {    withDoContext(func() {        fmt.Println("quit doing")    })}func Reboot() {    fmt.Println("reboot doing")}// 带有返回值的context// 改造 －withContextfunc withDoContextString(fn func() string) string {    do := Do{Name: "do"}    do.Lock()    defer do.UnLock()    return fn()}func main() {    fmt.Println("Start Main func()")    Say()    Fuck()    // 改造后    Quit()    withDoContext(Reboot)    msg := withDoContextString(func() string { return "hahah" })    fmt.Println("msg ", msg)}

输出:

Start Main func()Say Lock ...say doingSay Unlock ~Fuck Lock ...fuck doingFuck Unlock ~do Lock ...quit doingdo Unlock ~do Lock ...reboot doingdo Unlock ~do Lock ...do Unlock ~msg  hahah

0 0