The difference between the go language structure method and the pointer method of structure body

This is a creation in Article, where the information may have evolved or changed.

First, I set up three interfaces, a structure, and three methods:

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}

Then I wrote some test code:

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 := &dept1if _, 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")}

What to print:

The dept1 is a DeptModeA.
The deptPtr1 is a DeptModeFull.
The deptPtr1 is a DeptModeA.
The deptPtr1 is a DeptModeB.

Assuming that T is a struct, then go follows several principles:

• The method set of T has only the method of T Receiver (the receiver in the method).
• The *t method set contains all methods (T + *t).

So your example above dept1 should be the owning method: Name and SetName

And &dept1 has methods: Name, SetName, and relocate

This is the type of receiver you need to be aware of when designing a method in go.