为什么在将接口分配给指针时,对类型断言结果赋值,并且在将其分配给结构对象分配接口时会出现“无法分配”错误?
以下是我的代码:
package main
import (
"fmt"
)
type Person interface {
SayHi()
}
type Student struct {
id int
name string
}
func (s Student) SayHi() {
fmt.Println("hi, i am", s.name, " my id is:", s.id)
}
func main() {
p1 := Person(&Student{id: 123, name: "William"})
p1.SayHi() // ok
p1.(*Student).SayHi() // ok here
p1.(*Student).id = 456 // ok here
p2 := Person(Student{id: 123, name: "William"})
p2.SayHi() //ok
p2.(Student).SayHi() // ok here
p2.(Student).id = 456 // error here and why?
fmt.Println("p1:", p1, " p2:", p2)
}
p2.(Student)
产生一种临时对象(副本),该对象会立即被处理。将其赋值的目的是什么? - myaut