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 ProcessAnimals(ICollectionGet <Animal> animals)
{
for (int index = 0; index < animals.Count; index++)
{
Console.WriteLine(animals.Get(index).Sound());
// animals.GetAnimal(index).FlapWings(); // Why does this NOT work...?
}
}
public void ProcessBirds(ICollectionGet <Bird> birds)
{
for (int index = 0; index < birds.Count; index++)
{
Console.WriteLine(birds.Get(index).Sound());
birds.Get(index).FlapWings(); // 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
}
