Go: 構造体を用いたインターフェース実装

func NewEntraceRepository()EntraceRepository {
    return &entraceRepository{};
}

var variable_value EntraceRepository=&entraceRepository{}　

func (n bookRepository) GetBookList(m map[string]interface{})(total int,books []models.Book){}

//Go - structure implementation interface
 
package main
 
import (
    "fmt"
 
    "github.com/pkg/errors"
)
 
var _ Study = (*study)(nil)
 
type Study interface {
    Listen(msg string) string
    Speak(msg string) string
    Read(msg string) string
    Write(msg string) string
Write(msg string) string
 
type study struct {
    Name string
Name string }
 
func (s *study) Listen(msg string) string {
    return s.Name + " listen " + msg
}
 
func (s *study) Speak(msg string) string {
    return s.Name + " speak " + msg
}
 
func (s *study) Read(msg string) string {
    return s.Name + " read " + msg
}
 
func (s *study) Write(msg string) string {
    return s.Name + " write " + msg
}
 
func New(name string) (Study, error) {
    if name == "" {
        return nil, errors.New("name required")
    }
 
    return &study{
        Name: name,
    }, nil
}
 
func main() {
    name := "Xiao Ming "
    s, err := New(name)
    if err ! = nil {
        fmt.Println(err)
    }
 
    fmt.Println(s.Listen("english"))
    fmt.Println(s.Speak("english"))
    fmt.Println(s.Read("english"))
    fmt.Println(s.Write("english"))
}