Golang通脉之类型定义

//1、定义结构体
//结构体定义
type person struct {
   name string //注意后面不能有逗号
   age  int
}

type USB interface {
 start()
 end()
}

type myint int
type mystr string

func main() {

  var i1 myint
  var i2 = 100
  i1 = 100
  fmt.Println(i1)
  //i1 = i2 //cannot use i2 (type int) as type myint in assignment
  fmt.Println(i1,i2)
  
  var name mystr
  name = "王二狗"
  var s1 string
  s1 = "李小花"
  fmt.Println(name)
  fmt.Println(s1)
  name = s1 //cannot use s1 (type string) as type mystr in assignment
}

func main() {
  res1 := fun1()
  fmt.Println(res1(10,20))
}


type my_fun  func (int,int)(string)

//fun1()函数的返回值是my_func类型
func fun1 () my_fun{
 fun := func(a,b int) string {
  s := strconv.Itoa(a) + strconv.Itoa(b)
  return s
 }
 return fun
}

type byte uint8
type rune int32

type byte = uint8
type rune = int32

//类型定义
type NewInt int

//类型别名
type MyInt = int

func main() {
 var a NewInt
 var b MyInt
 
 fmt.Printf("type of a:%T\n", a) //type of a:main.NewInt
 fmt.Printf("type of b:%T\n", b) //type of b:int
}

// 定义time.Duration的别名为MyDuration
type MyDuration = time.Duration
// 为MyDuration添加一个函数
func (m MyDuration) EasySet(a string) { //cannot define new methods on non-local type time.Duration
}
func main() {
}

type Person struct {
 name string
}

func (p Person) Show() {
 fmt.Println("Person-->",p.name)
}

//类型别名
type People = Person

type Student struct {
 // 嵌入两个结构
 Person
 People
}

func (p People) Show2(){
 fmt.Println("People------>",p.name)
}

func main() {
 //
 var s Student

 //s.name = "王二狗" //ambiguous selector s.name
 s.People.name = "李小花"
 s.Person.name = "王二狗"
 //s.Show() //ambiguous selector s.Show
 s.Person.Show()
 s.People.Show2()
 fmt.Printf("%T,%T\n",s.Person,s.People) //main.Person,main.Person

}