Go语言中结构体方法副本传参与指针传参的区别介绍

type DeptModeA interface {
Name() string
SetName(name string)
}
type DeptModeB interface {
Relocate(building string, floor uint8)
}
type Dept struct {
name string
building string
floor uint8
Key string
}
func (self Dept) Name() string {
return self.name
}
func (self Dept) SetName(name string) {
self.name = name
}
func (self *Dept) Relocate(building string, floor uint8) {
self.building = building
self.floor = floor
}

dept1 :=
Dept{
name: "MySohu",
building: "Internet",
floor: 7}
switch v := interface{}(dept1).(type) {
case DeptModeFull:
fmt.Printf("The dept1 is a DeptModeFull.\n")
case DeptModeB:
fmt.Printf("The dept1 is a DeptModeB.\n")
case DeptModeA:
fmt.Printf("The dept1 is a DeptModeA.\n")
default:
fmt.Printf("The type of dept1 is %v\n", v)
}
deptPtr1 := &dept1
if _, ok := interface{}(deptPtr1).(DeptModeFull); ok {
fmt.Printf("The deptPtr1 is a DeptModeFull.\n")
}
if _, ok := interface{}(deptPtr1).(DeptModeA); ok {
fmt.Printf("The deptPtr1 is a DeptModeA.\n")
}
if _, ok := interface{}(deptPtr1).(DeptModeB); ok {
fmt.Printf("The deptPtr1 is a DeptModeB.\n")
}

The dept1 is a DeptModeA.

The deptPtr1 is a DeptModeFull.

The deptPtr1 is a DeptModeA.

The deptPtr1 is a DeptModeB.

package main
import (
 "fmt"
)
type B struct {
 Name string
}
func(b B) Test1() {
 fmt.Printf("Test1 addr:%p\n", &b)
 fmt.Printf("Test1 name:%s\n", b.Name)
 b.Name = "john"
}
func(b *B) Test2() {
 fmt.Printf("Test2 addr:%p\n", b)
 fmt.Printf("Test2 name:%s\n", b.Name)
 b.Name = "john"
}
func main() {
 b := B{}
 b.Test1()
 b.Test1()
 b.Test2()
 b.Test2()
}

Test1 addr:0xc42000e1e0
Test1 name:
Test1 addr:0xc42000e1f0
Test1 name:
Test2 addr:0xc42000e1d0
Test2 name:
Test2 addr:0xc42000e1d0
Test2 name:john