interface-values-with-nil

Language: Gold, Platform: Echoes, Category: Tour of Go
https://github.com/remobjects/ElementsSamples/tree/master/Gold/Echoes/Tour of Go/interface-values-with-nil

• interface-values-with-nil.Echoes
  • References
    • #
  • Source Files
    • interface-values-with-nil.go
  • Other Files

interface-values-with-nil.go

// Ignored build directive: +build OMIT

package main

import "fmt"

type I interface {
	M()
}

type T struct {
	S string
}

func (t *T) M() {
	if t == nil {
		fmt.Println("<nil>")
		return
	}
	fmt.Println(t.S)
}

func main() {
	var i I

	var t *T
	i = t
	describe(i)
	i.M()

	i = &T{"hello"}
	describe(i)
	i.M()
}

func describe(i I) {
	fmt.Printf("(%v, %T)\n", i, i)
}