C#

interface ISomething
abstract class SomethingBase : ISomething
class SomethingSpecial : SomethingBase

public abstract class ShapeBase{...}
public class Triangle : ShapeBase {...}

public abstract class AShape{...}
public class Triangle : AShape{...}

Abhinav S wrote:

But I occasionally add the postfix Base to a class that I want to be the parent class to be inherited.

thatraja |Chennai|India|

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[Flags]
enum ArrowKeyStates {
  None = 0,

  Left = 1,
  Up = 2,
  Right = 4,
  Down = 8,

  // Then a few more to make testing for diagonals easy...
  UpLeft = 3,
  UpRight = 6,
  DownLeft = 9,
  DownRight = 12
}

// To set a key as pressed, use a binary OR:
MyKeyState |= ArrowKeyStates.Left;

// To set a key as released, use a binary XOR:
MyKeyState ^= ArrowKeyStates.Left;