扩展已有类型的

程序结构

project
    queue/
        - queue.go
       entry/
           - entry.go
   -go.mod

代码

• go.mod

module carmen.com/study
go 1.23

• queue/queue.go

package queue

type Queue []int

func (q *Queue) Push(v int)  {
	*q = append(*q,v)
}

func (q *Queue) Pop() int  {
	head := (*q)[0]
	*q = (*q)[1:]
	return head
}

func (q *Queue) IsEmpty() bool{
	return len(*q) ==0
}

• queue/entry/entry.go

package main

import (
	"carmen.com/study/queue"
	"fmt"
)

func main() {
	q := queue.Queue{1}
	q.Push(2)
	q.Push(3)
	q.Push(4)
	fmt.Print(q)

	fmt.Println(q.Pop())
	fmt.Println(q.Pop())
	fmt.Println(q.Pop())
	fmt.Println(q.IsEmpty())
	fmt.Println(q.Pop())
	fmt.Println(q.IsEmpty())
}