Abstract classes and abstract methods in C#

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Abstract classes, Interfaces, and Patterns - slide 7 : 37

Abstract classes and abstract methods in C#

An abstract Stack without data representation, but with some implemented operations

An abstract class Stack - without data representation - with a non-abstract ToggleTop method.

Detailed rules - some are surprising
- Abstract classes
  - can be derived from a non-abstract class
  - do not need not to have abstract members
  - can have constructors
- Abstract methods
  - are implicitly virtual

A specialization of Stack

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