go の動的型変換

gistfile1.txt

package main

import (
	"fmt"
	"math/rand"
)

func main() {
	var p Point = Point{2, 3}
	var q Quality = Quality{99.9}
	fmt.Println(p, q)
	
	var x Any

	fmt.Println(rand.Intn(2))
	
	if rand.Intn(2) == 1 {
		x = p
	} else {
		x = q
	}
	
	v, ok := x.(Quality)
	if !ok {
		fmt.Println("Not a Quality")
	}
	fmt.Println(v)
}

type Any interface{}

type Point struct {
	X int
	Y int
}

type Quality struct {
	Value float64
}