Go: Pointer receivers

ptrrecv.go

package main

import "fmt"

type _struct struct {
	field string
}

func (s *_struct) doStuff(msg string) {
	s.field = msg
	fmt.Println("I am doing stuff dammit, and field is ", s.field)
}

func (s _struct) doOtherStuff(msg string) {
	s.field = msg
	// Yeah, man, but this is just your copy.
	fmt.Println("I am doing other stuff dammit, and field is ", s.field)
}

type _ifc interface {
	doStuff(msg string)
	doOtherStuff(msg string)
}

func main() {

	var struct1 _struct
	fmt.Println("Empty: ", struct1.field)

	// See https://stackoverflow.com/questions/42477951/what-is-the-method-set-of-sync-waitgroup
	// Automatically will call method with pointer receiver with &struct1:
	struct1.doStuff("left")
	fmt.Println(struct1.field)

	struct1.doOtherStuff("right")
	// Still "left" because not a pointer receiver
	fmt.Println(struct1.field)

}