import UIKit

import Foundation

struct Product {
    var retailPrice: Double
    var name: String
}

extension Product: Hashable {
    var hashValue: Int {
        return name.hashValue ^
            retailPrice.hashValue &* 16777619
    }
    
    func hash(into hasher: inout Hasher) {
        hasher.combine(name)
        hasher.combine(retailPrice)
    }
    
    static func == (lhs: Product, rhs: Product) -> Bool {
        return lhs.name == rhs.name
    }
}

class Check {
    
    var products: [Product: Int] = [:]
    
    var count = 0
    func addProduct(product: Product) {
        count += 1
        products.updateValue(count, forKey: product)
    }
}

var check = Check()
var productOne = Product(retailPrice: 1, name: "1")
var productTwo = Product(retailPrice: 2, name: "2")
var productThree = Product(retailPrice: 3, name: "3")
var productFour = Product(retailPrice: 4, name: "4")
var productFive = Product(retailPrice: 5, name: "5")

check.addProduct(product: productOne)
check.addProduct(product: productOne)
check.addProduct(product: productOne)