如何在Go中创建map [string] [2] int？ [重复]

Question

This question already has an answer here:

• Can not assign to pair in a map 3 answers

I want to create a map[string][2]int in Go. I tried this at go playground but I got errors. How can I solve this?

fmt.Println("Hello, playground")
m:= make(map [string][2]int)
m["hi"]={2,3}
m["heello"][1]=1
m["hi"][0]=m["hi"][0]+1
m["h"][1]=m["h"][1]+1
fmt.Println(m)

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Answer 1

Your map initialization is correct. You just need to explicitly declare the type of your map element:

m:= make(map [string][2]int)
m["test"] = [2]int{1,3}
fmt.Println(m)

This approach work if you don't need to access underlying elements.

If you need this, you have to use pointers:

package main

import (
    "fmt"
)

func main() {
    fmt.Println("Hello, playground")
    m := make(map[string]*[2]int)
    m["hi"] = &[2]int{2, 3}
    m["heello"] = &[2]int{0, 1}
    m["hi"][0] = m["hi"][0] + 1
    // commented out. Initialize it first
    //m["h"][1]=m["h"][1]+1
    fmt.Println(m) // 2 address
    fmt.Println(m["hi"], m["heello"])
}