go语言中的结构体嵌入详解(最新推荐)

type Base struct {
	ID   int
	Name string
}
type User struct {
	Base   // 嵌入结构体（匿名字段）
	Age int
}

type User struct {
	Base Base
	Age  int
}

u := User{
	Base: Base{
		ID:   1,
		Name: "Tom",
	},
	Age: 18,
}
fmt.Println(u.ID)        // 1
fmt.Println(u.Name)      // Tom
fmt.Println(u.Base.ID)   // 1（也可以）

type Base struct{}
func (b Base) Hello() {
	fmt.Println("hello from Base")
}
type User struct {
	Base
}

var u User 
u.Hello() // 等价于 u.Base.Hello()

type Logger struct{}
func (l Logger) Log() { fmt.Println("log") }
type Auth struct{}
func (a Auth) Check() { fmt.Println("auth") }
type Service struct {
	Logger
	Auth
}

s := Service{}
s.Log()
s.Check()

type A struct {
	Name string
}
type B struct {
	Name string
}
type C struct {
	A
	B
}

c.Name // 编译错误：ambiguous selector

c.A.Name 
c.B.Name

type Base struct {
	Name string
}
type User struct {
	Base
	Name string
}

u := User{}
u.Name = "UserName"      // 访问的是 User.Name
u.Base.Name = "BaseName"

type User struct {
	Base
}

type User struct {
	*Base
}

b := &Base{ID: 1}
u := User{Base: b}
u.ID = 2
fmt.Println(b.ID) // 2

type Speaker interface {
	Speak()
}
type Human struct{}
func (h Human) Speak() {
	fmt.Println("human speak")
}
type Student struct {
	Human
}

var s Speaker = Student{} // ✅ Student 自动实现 Speaker
s.Speak()

type MyInt int
type Counter struct {
	MyInt
}

c := Counter{}
c.MyInt = 10

type Model struct {
	ID        uint
	CreatedAt time.Time
	UpdatedAt time.Time
}
type Order struct {
	Model
	OrderNo string
}

type Service struct {
	*Logger
	*DB
}