實(shí)現(xiàn)類似python中裝飾器的函數(shù)

package main

import (
    "fmt"
)

func main(){
     //可以當(dāng)成類型復(fù)制
    ss := outsay("fucking golang",ssay)
    ss("yangtuo")
}

func ssay(s string){
    fmt.Println("lets go say: ", s)
}

func outsay(s string,f func( string)) (func(string)){  //有點(diǎn)像python裝飾器
    fmt.Println("this is outside code for add on say function")
    fmt.Println("handle 參數(shù)，",s)
    return f
}

type typenam func(...)...用法例子

package main

import "fmt"

func main() {
    chr := 'K'
    chr -= ('A' - 'a')      //大寫換小寫
    fmt.Println(string(chr))

    t := File{
        name: "wanlb",
    }
    if t.testfunc == nil{
        fmt.Println("t testfunc is null")
        t.testfunc = testfunc(hello)
        t.testfunc("qiushu")
    }

}

type testfunc func(name string) string

func (t testfunc) say(){
    fmt.Println("test")
}

type File struct {
    name string
     testfunc
}

func hello(name string) string{
    fmt.Println("this is for test typefunc",name)
    return "ok test done"
}

testfunc 類理解：像是一類結(jié)合（funcname func(name string) string），都可以將函數(shù)類換成具體有函數(shù)內(nèi)容的函數(shù)，進(jìn)行調(diào)用；跟interface{}有點(diǎn)像，空接口可以轉(zhuǎn)成任何類一樣，空接口也是類的集合！