golang decorator
package main
import (
"fmt"
)
type pizza interface {
getPrice() int
}
type veggeMania struct {
}
func (p *veggeMania) getPrice() int {
return 15
}
type tomatoTopping struct {
pizza pizza
}
func (c *tomatoTopping) getPrice() int {
pizzaPrice := c.pizza.getPrice()
return pizzaPrice + 7
}
type cheeseTopping struct {
pizza pizza
}
func (c *cheeseTopping) getPrice() int {
pizzaPrice := c.pizza.getPrice()
return pizzaPrice + 10
}
func main() {
pizza := &veggeMania{}
//Add cheese topping
pizzaWithCheese := &cheeseTopping{
pizza: pizza,
}
//Add tomato topping
pizzaWithCheeseAndTomato := &tomatoTopping{
pizza: pizzaWithCheese,
}
fmt.Printf("Price of veggeMania with tomato and cheese topping is %dn",
pizzaWithCheeseAndTomato.getPrice())
// Price of veggeMania with tomato and cheese topping is 32
}