static void Main(string[] args)
{
// No problem, since Collection implements
// ICollectionGet and ICollectionSet
Collection <Bird> birds = new Collection <Bird>();
ICollectionGet <Bird> birdsGet = birds;
ICollectionSet <Bird> birdsSet = birds;
// No problem, since Collection implements
// ICollectionGet and ICollectionSet
Collection <Animal> animals = new Collection <Animal>();
ICollectionGet <Animal> animalsGet = animals;
ICollectionSet <Animal> animalsSet = animals;
AnimalProcessor processor = new AnimalProcessor();
// How many of these work...?
//
//processor.ProcessAnimals(birdsGet); // Case A
//processor.ProcessAnimals(animalsGet); // Case B
//processor.ProcessBirds(birdsGet); // Case C
//processor.ProcessBirds(animalsGet); // Case D
//processor.InsertAnimals(birdsSet); // Case E
//processor.InsertAnimals(animalsSet); // Case F
//processor.InsertBirds(birdsSet); // Case G
//processor.InsertBirds(animalsSet); // Case H
KeepConsoleWindowOpen();
}
public void InsertBirds(ICollectionSet <Bird> birds)
{
for (int index = 0; index < 5; index++)
{
Bird b = new Bird("Tweety");
b.FlapWings();
birds.Set(b);
Cat c = new Cat("Spot");
c.Purr();
// birds.SetAnimal(c); // Why does this NOT work...?
}
}
public void InsertAnimals(ICollectionSet <Animal> animals)
{
for (int index = 0; index < 5; index++)
{
Bird b = new Bird("Tweety");
b.FlapWings();
animals.Set(b); // Why does this work..?
Cat c = new Cat("Spot");
c.Purr();
animals.Set(c); // Why does this work..?
}
}
private static void VarianceTests()
{
// No problem, obviously
Bird b = new Bird("Olaf");
Console.WriteLine(b.Sound());
// No problem, since Bird inherits from Animal
Animal a = new Bird("Piphans");
Console.WriteLine(a.Sound());
// No problem, since AnimalCollection implements
// ICollectionGet and ICollectionSet
Collection <Bird> birds = new Collection <Bird>();
ICollectionGet <Bird> birdsGet = birds;
ICollectionSet <Bird> birdsSet = birds;
// No problem, since AnimalCollection implements
// ICollectionGet and ICollectionSet
Collection <Animal> animals = new Collection <Animal>();
ICollectionGet <Animal> animalsGet = animals;
ICollectionSet <Animal> animalsSet = animals;
AnimalProcessor processor = new AnimalProcessor();
// How many of these work...?
////
//processor.ProcessAnimals(birdsGet); // Case A
//processor.ProcessAnimals(animalsGet); // Case B
//processor.ProcessBirds(birdsGet); // Case C
//processor.ProcessBirds(animalsGet); // Case D
//processor.InsertAnimals(birdsSet); // Case E
//processor.InsertAnimals(animalsSet); // Case F
//processor.InsertBirds(birdsSet); // Case G
//processor.InsertBirds(animalsSet); // Case H
}
