go语言结构体定义使用

package main

import (

    "fmt"

    "sync"

)

type Info struct {

    info map[int]string

    mu   sync.RWMutex

}

func main() {

    x := &Info{info: make(map[int]string)}

    x.Set(1, "golang")

    s := x.Get(1)

    fmt.Println(s)

}

func (s *Info) Get(i int) string {

    s.mu.RLock()

    info := s.info[i]

    s.mu.RUnlock()

    return info

}

func (s *Info) Set(i int, name string) bool {

    s.mu.Lock()

    defer s.mu.Unlock()

    _, present := s.info[i]

    if present {

        return false

    }

    s.info[i] = name

    return true

}

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