A structure can be nested to contain another structure or structure pointer.
//Address 地址结构体
type Address struct {
Province string
City string
}
//User 用户结构体
type User struct {
Name string
Gender string
Address Address
}
func main() {
//直接实例化该嵌套结构体
user1 := User{
Name: "pprof",
Gender: "女",
Address: Address{
Province: "黑龙江",
City: "哈尔滨",
},
}
fmt.Printf("user1=%#v\n", user1)//user1=main.User{Name:"pprof", Gender:"女", Address:main.Address{Province:"黑龙江", City:"哈尔滨"}}
}
1. Nested anonymous structures
//Address 地址结构体
type Address struct {
Province string
City string
}
//User 用户结构体
type User struct {
Name string
Gender string
Address //匿名结构体
}
func main() {
var user2 User
user2.Name = "pprof"
user2.Gender = "女"
user2.Address.Province = "黑龙江" //通过匿名结构体.字段名访问
user2.City = "哈尔滨" //直接访问匿名结构体的字段名
fmt.Printf("user2=%#v\n", user2) //user2=main.User{Name:"pprof", Gender:"女", Address:main.Address{Province:"黑龙江", City:"哈尔滨"}}
}
When accessing a structure member, the field will be searched in the structure first, and if it is not found, it will be searched in the anonymous structure.
2. The field name conflict of the nested structure
The same field name may exist inside a nested structure. At this time, in order to avoid ambiguity, you need to specify the fields of the specific embedded structure.
//Address 地址结构体
type Address struct {
Province string
City string
CreateTime string
}
//Email 邮箱结构体
type Email struct {
Account string
CreateTime string
}
//User 用户结构体
type User struct {
Name string
Gender string
Address
Email
}
func main() {
var user3 User
user3.Name = "pprof"
user3.Gender = "女"
//备注:这里便不能直接访问结构体中的字段了
//需要指明结构体才行
// user3.CreateTime = "2019" //ambiguous selector user3.CreateTime
user3.Address.CreateTime = "2000" //指定Address结构体中的CreateTime
user3.Email.CreateTime = "2000" //指定Email结构体中的CreateTime
}