package main

import (
	"errors"
	"fmt"
	"golang.org/x/exp/constraints"
)

type Maybe[T any] struct {
	Value T
}

type None struct {
}

func (n None) Unwarp() any {
	return errors.New("empty")
}

func (m Maybe[T]) Unwarp() any {
	return m.Value
}

type Option interface {
	Unwarp() any
}

func division[T constraints.Float](m, n int) Option {
	if n == 0 {
		return None{}
	}
	result := T(m) / T(n)
	return Maybe[T]{result}
}

func main() {
	divide := division[float64](10, 20)
	value := divide.Unwarp()
	switch value.(type) {
	case error:
		fmt.Println("Can't divide.")
		break
	default:
		fmt.Println(value)
	}
}