Post

Day07（指针和结构体）

Posted Updated
By Cc 2 min read

指针和结构体

源码

指针

Go 语言指针与 C 语言指针不一样理解,一个指针变量指向了一个值的内存地址。

类似于变量和常量，在使用指针前你需要声明指针

示例

  • 示例一：

    func new(Type) *Type 说明 new()方法 返回值就是指针

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package main

import (
	"github.com/Cc360428/HelpPackage/UtilsHelp/logs"
)

func main() {
	intType := new(int)
	logs.Info(intType)
	var intType1 *int
	logs.Info(intType1)
	var intType2 int
	logs.Info(intType2)
}

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2020/04/23 22:21:59.542 [I] [pointer.go:9]  0xc000012380
2020/04/23 22:21:59.566 [I] [pointer.go:11]  <nil>
2020/04/23 22:21:59.566 [I] [pointer.go:13]  0
  • 示例 2
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package main

import (
	"github.com/Cc360428/HelpPackage/UtilsHelp/logs"
)

func main() {
	var a int = 20 // 声明实际变量
	var ip *int    // 声明指针变量
	ip = &a        // 将变量 a 的指针复制给 ip
	logs.Info(&a)
	logs.Info(ip)  // 指针变量的存储地址
	logs.Info(*ip) // 使用指针访问值
}

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2020/04/23 22:30:34.230 [I] [pointer2.go:11]  0xc0000882d0
2020/04/23 22:30:34.273 [I] [pointer2.go:12]  0xc0000882d0
2020/04/23 22:30:34.273 [I] [pointer2.go:13]  2

结构体

基础语法

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package main

import "github.com/Cc360428/HelpPackage/UtilsHelp/logs"

// User 用户结构体
type User struct {
	Name   string `json:"name"`
	Age    int    `json:"age"`
	Email  string `json:"email"`
	Statuc bool   `json:"statuc"`
}

func main() {
	var user User
	logs.Info(user)
	logs.Info(User{"lcc", 18, "lcc@lcc.com", false})
	var user2 User
	user2.Age = 23
	user2.Name = "Cc"
	user2.Email = "Cc@cc.com"
	user2.Statuc = true
	logs.Info(user2)
	logs.Info(user2.Age)
	logs.Info(user2.Name)
}

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2020/04/23 22:45:58.034 [I] [struct.go:15]  { 0  false}
2020/04/23 22:45:58.061 [I] [struct.go:16]  {lcc 18 lcc@lcc.com false}
2020/04/23 22:45:58.061 [I] [struct.go:22]  {Cc 23 Cc@cc.com true}
2020/04/23 22:45:58.061 [I] [struct.go:23]  23
2020/04/23 22:45:58.061 [I] [struct.go:24]  Cc

进阶

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package main

import "github.com/Cc360428/HelpPackage/UtilsHelp/logs"

// User 用户结构体
type User struct {
	Name   string `json:"name"`
	Age    int    `json:"age"`
	Email  string `json:"email"`
	Statuc bool   `json:"statuc"`
}

// InitUser 获取User
func (u *User) InitUser(name string) (*User, error) {
	u.Name = name
	return u, nil
}
func main() {
	user := new(User)
	user.Age = 6
	user2, _ := user.InitUser("lcc")
	logs.Info(user2)
}

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2020/04/23 22:51:45.282 [I] [struct2.go:22]  &{lcc 6  false}
Language, Go
Server Go GoBase
This post is licensed under CC BY 4.0 by the author.