Hands-On System Programming with Go

Interfaces

Another note about this package is that if you are working with interfaces, their implementation should be registered first, using the functions:

func Register(value interface{})func RegisterName(name string, value interface{})

This will make the package aware of the specified types and it will enable us to call decode on the interface type. Let's start by defining an interface and its implementation for our struct:

type Greeter interface {    Greet(w io.Writer)}type Character struct {    Name        string `gob:"name"`    Surname     string `gob:"surname"`    Job         string `gob:"job,omitempty"`    YearOfBirth int    `gob:"year_of_birth,omitempty"`}func (c Character) Greet(w io.Writer) {    fmt.Fprintf(w, "Hello, my name is %s %s", c.Name, c.Surname) if c.Job != ...