Golang 如何将一个函数作为另一个函数的输入值，清晰透彻的注释
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package main
import ( "fmt" "reflect" "time" ) //输入参数是个函参且函参函数没有输入参数 func GoFunc1(f func()) { go f() } //输入参数第1个是个函参且函参函数只有1个接口型输入值，第2参数是函参函数的输入参数 func GoFunc2(f func(interface{}),i interface{}) { go f(i) } //输入参数第1个是接口参数类型,第2个输入参数是变参类型 func GoFunc3(i interface{},args ...interface{}) { if len(args) > 1 { //接口 i 调用函数格式满足func(...interface{})，输入参数格式是变参类型，那么满足这样条件的函数只有f3符合 go i.(func(...interface{}))(args) } else if len(args) == 1 { //接口 i 调用函数格式满足func(interface{})，输入参数格式只有1个接口类型，那么满足这样条件的函数只有f2符合 go i.(func(interface{}))(args[0]) } else { //接口 i 调用函数格式满足func()，没有输入参数的格式，那么满足这样条件的函数只有f1符合 go i.(func())() } } //没有输入参数的函数 func f1() { fmt.Println("f1 has been run completely.") } //输入参数是只有1个接口的函数 func f2(i interface{}) { //多选语句switch要先知到它是几个类型中的一个,i.(type)只能在switch中使用,这函数没有返回值 switch i.(type) { case string: //是字符时做的事情 fmt.Println(i," is type of string in f2") case int: //是整数时做的事情 fmt.Println(i," is type of int in f2") default: fmt.Println("无法识别类型：",i) //例如输入1个布尔值 } //反射这个方法可以对任意对象使用 fmt.Println("f2 has been run completely,",i,"真实的对象类型:",reflect.TypeOf(i)) } //变参函数是参数个数和类型都不确定的函数 func f3(args ...interface{}) { fmt.Println("f3 has been run completely,"args length = ",len(args),args[0] = ",args[0],args[0] Type = ",reflect.TypeOf(args[0])) for _,arg := range args[0].([]interface{}) { switch v := arg.(type) { case int: fmt.Println(v," is type of int in f3") case int32: fmt.Println(v," is type of int32 in f3") case int64: fmt.Println(v," is type of int64 in f3") case bool: fmt.Println(v," is type of bool in f3") case string: fmt.Println(v," is type of string in f3") case float32: fmt.Println(v," is type of float32 in f3") case float64: fmt.Println(v," is type of float64 in f3") default: fmt.Println(v," data type has been not yet supported,reflect.TypeOf = ",reflect.TypeOf(v)," in f3") } } fmt.Println("===================================================================") for _,arg := range args[0].([]interface{}) { fmt.Println("Value = ",arg," reflect.TypeOf = ",reflect.TypeOf(arg)," in f3") } fmt.Println("===================================================================") } func main() { GoFunc3(f3,"moxi","moxi?",19861206,3.1415927) GoFunc1(f1) GoFunc2(f2,1<<20) GoFunc3(f1) GoFunc3(f2,"So in Love") GoFunc3(f2,true) //阻塞主进程5秒后结束，也就是所有的协程只有5秒代码的执行时间， //不管这些协程有没有处理完工作，将退出整个程序 time.Sleep(500 * time.Second) }
调试控制台打印输出如下信息： 2017/07/01 12:49:13 server.go:73: Using API v1 2017/07/01 12:49:13 debugger.go:97: launching process with args: [/root/code/go/src/contoso.org/book/debug] API server listening at: 127.0.0.1:2345 2017/07/01 12:49:13 debugger.go:505: continuing f3 has been run completely,args length = 1,args[0] = [moxi moxi? 19861206 3.1415927],args[0] Type = []interface {} moxi is type of string in f3 moxi? is type of string in f3 19861206 is type of int in f3 3.1415927 is type of float64 in f3 =================================================================== Value = moxi reflect.TypeOf = string in f3 Value = moxi? reflect.TypeOf = string in f3 Value = 19861206 reflect.TypeOf = int in f3 Value = 3.1415927 reflect.TypeOf = float64 in f3 =================================================================== f1 has been run completely. 1048576 is type of int in f2 f2 has been run completely,1048576 真实的对象类型: int f1 has been run completely. So in Love is type of string in f2 f2 has been run completely,So in Love 真实的对象类型: string 无法识别类型： true f2 has been run completely,true 真实的对象类型: bool （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |