static void Main(string[] args)
{
// get the couple
Couple c1 = Couple.GetInstance(1);
Couple c2 = Couple.GetInstance(2);
// print out some diagnostic information
if (c1 != null && c2 != null)
{
Console.WriteLine("Couple.GetInstance(1) returns " + c1.GetHashCode());
Console.WriteLine("Couple.GetInstance(2) returns " + c2.GetHashCode());
}
else
{
Console.WriteLine("Couple.GetInstance() did not return an instance.");
return;
}
// check that it really is a couple
bool ok = true;
Couple newc1 = Couple.GetInstance(1);
Couple newc2 = Couple.GetInstance(2);
if (c1 != newc1)
{
Console.WriteLine("Couple.GetInstance(1) returned a different instance " + newc1.GetHashCode());
ok = false;
}
if (c2 != newc2)
{
Console.WriteLine("Couple.GetInstance(2) returned a different instance " + newc2.GetHashCode());
ok = false;
}
if (c1 == c2)
{
Console.WriteLine("Couple.GetInstance(1) and Couple.GetInstance(2) return the same instance.");
ok = false;
}
if (ok)
{
Console.WriteLine("Tests passed.");
}
Console.ReadLine();
}
public static Couple GetInstance(int number)
{
if (c1 == null)
{
c1 = new Couple();
}
if (c2 == null)
{
c2 = new Couple();
}
if (number == 1)
{
return(c1);
}
else
{
return(c2);
}
}
public static Couple GetInstance(int value)
{
if (c1 == null)
{
c1 = new Couple();
}
if (c2 == null)
{
c2 = new Couple();
}
if (value == 1)
{
return(c1);
}
else
{
return(c2);
}
}
public static Couple GetInstance(int value)
{
if (value == 1)
{
// check if c1 is instantiated
if (c1 == null)
{
c1 = new Couple();
}
return(c1);
}
else
{
// check if c2 is instantiated
if (c2 == null)
{
c2 = new Couple();
}
return(c2);
}
}
