Sample structs which violate Dependency Inversion Principle

di_1.go

package main

import "log"

// This violates Dependency Inversion Principle                                            
type LogWriter struct {
        Counter	int
}
func (w *LogWriter) Write(msg string) {
        log.Println(msg)
	w.Counter++
}

// Watcher tightly couples with LogWriter                                           
// with its instance as a struct field.                                                    
type Watcher struct {
	Writer *LogWriter
}

// Then this method calls the LogWriter's method                                           
func (w *Watcher) Notify(msg string) {
        w.Writer.Write(msg)
}