Go基础--10 行为定义和实现

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于 2021-05-26 21:57:23 发布

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分类专栏： Go 文章标签： go golang

本文链接：https://blog.youkuaiyun.com/coder279/article/details/117306296

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本文介绍了如何在Go语言中定义结构体Employee，并展示了如何创建实例、避免内存拷贝，以及通过unsafe包获取内存地址。重点讲解了如何在测试中操作结构体并关注内存操作效率。

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定义结构体

package encapsulation

import "testing"

type Employee struct {
	Id string
	Age int64
	Name string
}

func TestCreateEmployee(t *testing.T){
	e := Employee{"0",20,"leo"}
	e1 := Employee{Name:"ioe"}
	e2 := new(Employee) //指针类型
	e2.Id = "20"
	e2.Name = "Cherry"
	e2.Age = 30
	t.Log(e)
	t.Log(e1)
	t.Log(*e2)
}

避免内存拷贝

package encapsulation

import (
	"fmt"
	"testing"
	"unsafe"
)

type Employee struct {
	Id string
	Age int64
	Name string
}

func TestCreateEmployee(t *testing.T){
	e := Employee{"0",20,"leo"}
	e1 := Employee{Name:"ioe"}
	e2 := new(Employee)
	e2.Id = "20"
	e2.Name = "Cherry"
	e2.Age = 30
	t.Log(e)
	t.Log(e1)
	t.Log(*e2)
}

//func (e *Employee) String() string{
//	fmt.Printf("Address is %x\n",unsafe.Pointer(&e.Name))
//	return fmt.Sprintf("ID:%s-Name:%s-Age:%d",e.Id,e.Name,e.Age)
//}
func (e Employee) String() string{
	fmt.Printf("Address is %x\n",unsafe.Pointer(&e.Name))
	return fmt.Sprintf("ID:%s-Name:%s-Age:%d",e.Id,e.Name,e.Age)
}

func TestStructOperations(t *testing.T){
	e := Employee{"1",20,"Bob"}
	e.String()
	fmt.Printf("Address is %x\n",unsafe.Pointer(&e.Name))
}