前往：获取地图成员的地址

Question

Can someone explain why r contains two entires of the same address?

r := make([]*Result, len(m))
i := 0
for _, res := range m {
    fmt.Println("index, result:", i, *&res)
    r[i] = &res
    i++
}
fmt.Println(r)

Results in:

index, result: 0 {[] map[0:1 1:1] {port=6379}}
index, result: 1 {[] map[0:1 1:1] {port=6380}}
[0xc21010d6c0 0xc21010d6c0]

Answer 1

Use *Result as the map value. For example,

package main

import "fmt"

type Result struct{}

func main() {
    m := make(map[string]*Result)
    r := make([]*Result, 0, len(m))
    for _, res := range m {
        fmt.Println("index, result:", len(r), *res)
        r = append(r, res)
    }
    fmt.Println(r)
}