Golang类型接口{}是没有方法的接口 [英] Golang type interface {} is interface with no methods

问题描述

目前我有这样的东西

main.go

  gojob.NewJob（每2秒，pene，func（）{
t：= gojob.Custom（pene）
 log.Println（t）
}，struct {
 Id int 
} {
 1，
}）
  

和我的gojob包

  func NewJob（t string，name string，c func（），v interface { ）{
e：= strings.Split（t，）
 job：= process（e）
 job.log = false 
 job.name = name 
 job.action = c 
 job.custom = v 
 jobs = append（jobs，job）
} 
  

和

  func自定义（名称字符串）界面{} {
 for i：=范围jobs {
如果jobs [i] .name！= name {
 continue 
} 
 return jobs [i] .custom 
} 
返回nil 
} 
  

Thing是Im传递给New的函数作业是beeing在goroutine上每2秒钟执行一次，但我想访问我通过的匿名结构...但是，当我尝试访问时

t.Id

进入

t.Id undefined（type interface {}是没有方法的接口）

然而，打印t给了我预期的结果

{1}

解决方案您必须先键入断言到兼容的类型，然后才能访问其字段。

  id：= v。（struct {Id int}）。Id 
  

Currently Im having something like this

main.go

gojob.NewJob("every 2 second", "pene", func() {
        t := gojob.Custom("pene")
        log.Println(t)
    }, struct {
        Id int
    }{
        1,
    })

And my gojob package

func NewJob(t string, name string, c func(), v interface{}) {
    e := strings.Split(t, " ")
    job := process(e)
    job.log = false
    job.name = name
    job.action = c
    job.custom = v
    jobs = append(jobs, job)
}

And

func Custom(name string) interface{} {
    for i := range jobs {
        if jobs[i].name != name {
            continue
        }
        return jobs[i].custom
    }
    return nil
}

Thing is the function Im passing to NewJob is beeing executed every 2 seconds on a goroutine but I want to access the anonymous struct I passed... however when I try to access

t.Id

Im getting

t.Id undefined (type interface {} is interface with no methods)

However printing t gives me the expected result

{1}

解决方案

You have to type assert it to a compatible type before you can access its fields.

id := v.(struct{Id int}).Id

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