go: nil_receiver

nil_receiver.go

package main

import "log"

type Object struct {
}

func (o Object) value() {
	log.Println(o, "call value receiver")
}

func (o *Object) pointer() {
	log.Println(o, "call pointer receiver")
}

func main() {
	o := Object{}
	o.value()
	o.pointer()

	p := &Object{}
	p.value()
	p.pointer()

	p = nil
	// p.value() // panic: runtime error: invalid memory address or nil pointer dereference
	p.pointer() // not panic!
}