static MoneyAmount Reserve(MoneyAmount cost)
{
decimal factor = 1;
if (IsHappyHour)
{
factor = 0.5M;
}
Console.WriteLine("\nReserving an item that cost: {0}.", cost);
return(cost.Scale(factor));
}
static void Main(string[] args)
{
/*Buy(new MoneyAmount(12, "USD"),
* new MoneyAmount(10, "USD"));
*
* Buy(new MoneyAmount(7, "USD"),
* new MoneyAmount(10, "USD"));
*
* IsHappyHour = true;
* Buy(new MoneyAmount(7, "USD"),
* new MoneyAmount(10, "USD"));*/
/*int x = 2;
* int y = 4;
* MoneyAmount x = new MoneyAmount(2, "USD");
* MoneyAmount y = new MoneyAmount(4, "USD");
*
* if (x.Equals(y))
* Console.WriteLine("Equal.");
* if ((x*2).Equals(y))
* Console.WriteLine("Equal after scaling.");*/
/*
* MoneyAmount x = new MoneyAmount(2, "USD");
* MoneyAmount y = new MoneyAmount(2, "USD");
*
* HashSet<MoneyAmount> set = new HashSet<MoneyAmount>();
* set.Add(x);
*
* if (set.Contains(y))
* Console.WriteLine("Cannot add repeated value.");
* else
* set.Add(y);
*
* Console.WriteLine("Count = {0}", set.Count);
*/
MoneyAmount x = new MoneyAmount(2, "USD");
MoneyAmount y = new MoneyAmount(4, "USD");
if (x == y)
{
Console.WriteLine("Equal.");
}
if ((x * 2) == y)
{
Console.WriteLine("Equal after scaling.");
}
Console.ReadLine();
}
// Reference types are susceptible to aliasing bugs;
// By changing contents of an existing object we are risking an aliasing bug to apear;
// Try to avoid instantiating objects directly;
// Modification to the constructor requires update in all consumers;
// Let objects of the class construct subsequent objects;
private static MoneyAmount Reserve(MoneyAmount cost)
{
decimal factor = 1;
var newCost = cost;
if (IsHappyHour)
{
// Create new object when content should change;
factor = .5M;
}
Console.WriteLine($"\nReserving an item that costs {cost}");
return(cost.Scale(factor));
}
private static void Buy(MoneyAmount wallet, MoneyAmount cost)
{
var enoughMoney = wallet.Amount >= cost.Amount;
var finalCost = Reserve(cost);
var finalEnough = wallet.Amount >= finalCost.Amount;
if (enoughMoney && finalEnough)
{
Console.WriteLine($"You will pay {cost} with your {wallet}.");
}
else if (finalEnough)
{
Console.WriteLine($"This time, {wallet} will be enough to pay {finalCost}");
}
else
{
Console.WriteLine($"You cannot pay {cost} with your {wallet}.");
}
}
static void Buy(MoneyAmount wallet, MoneyAmount cost)
{
bool enoughMoney = wallet.Amount >= cost.Amount;
MoneyAmount finalCost = Reserve(cost);
bool finalEnough = wallet.Amount >= finalCost.Amount;
if (enoughMoney && finalEnough)
{
Console.WriteLine("You will pay {0} with your {1}", cost, wallet);
}
else if (finalEnough)
{
Console.WriteLine("This time, {0} will be enough to pay {1}", wallet, finalCost);
}
else
{
Console.WriteLine("You cannot pay {0} with your {1}", cost, wallet);
}
}
private static void Main()
{
//Buy(
// new MoneyAmount(100, "USD"),
// new MoneyAmount(70, "USD")
//);
//IsHappyHour = true;
//Buy(
// new MoneyAmount(100, "USD"),
// new MoneyAmount(120, "USD")
//);
var x = new MoneyAmount(5, "USD");
var y = new MoneyAmount(5, "USD");
if (x == y)
{
Console.WriteLine("Equal.");
}
if ((x * 2) == y)
{
Console.WriteLine("Equal after scaling.");
}
//var x = 2;
//var y = 2;
//var set = new HashSet<MoneyAmount>();
//set.Add(x);
//if (set.Contains(y))
// Console.WriteLine("Cannot add repeated value.");
//else
// set.Add(y);
//Console.WriteLine($"Count = {set.Count}");
}
