Go中的3个变量映射

Question

I am trying to make a 3 variable map in go so that you can do something like.

var postlist = make(map[int][int]bool)

postlist[postid][userid] = true

if postid[postid][userid] = true {
   //do something
}

I have tried to make my own using a struct like

var postlist = make(map[int]cusmap)

type cusmap struct {
    userid     int
    seen       bool
}

but then I don't know how to check to check both the userid and seen bool condition.

Answer 1

I am not sure what you are trying to do, but a map is only a key/value. You can't have key/key/value. In order to do this, you need the value to be a map, so you would do:

http://play.golang.org/p/dOAXNAI4CO

package main

func main() {
    var postlist = make(map[int]map[int]bool)

    postid, userid := 0, 0

    postlist[postid] = make(map[int]bool)
    postlist[postid][userid] = true

    if postlist[postid][userid] == true {
        println("ok")
    } else {
        println("ko")
    }
}