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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                Golang匿名字段 :可以像字段成員那樣訪問匿名字段方法,編譯器負責查找。 ~~~ package main import "fmt" type User struct { id int name string } type Manager struct { User } func (self *User) ToString() string { // receiver = &(Manager.User) return fmt.Sprintf("User: %p, %v", self, self) } func main() { m := Manager{User{1, "Tom"}} fmt.Printf("Manager: %p\n", &m) fmt.Println(m.ToString()) } ~~~ 輸出結果: ~~~ Manager: 0xc42000a060 User: 0xc42000a060, &{1 Tom} ~~~ 通過匿名字段,可獲得和繼承類似的復用能力。依據編譯器查找次序,只需在外層定義同名方法,就可以實現 "override"。 ~~~ package main import "fmt" type User struct { id int name string } type Manager struct { User title string } func (self *User) ToString() string { return fmt.Sprintf("User: %p, %v", self, self) } func (self *Manager) ToString() string { return fmt.Sprintf("Manager: %p, %v", self, self) } func main() { m := Manager{User{1, "Tom"}, "Administrator"} fmt.Println(m.ToString()) fmt.Println(m.User.ToString()) } ~~~ 輸出結果: ~~~ Manager: 0xc420074180, &{{1 Tom} Administrator} User: 0xc420074180, &{1 Tom} ~~~
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