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  2. Virtual function - Wikipedia

    en.wikipedia.org/wiki/Virtual_function

    The concept of the virtual function solves the following problem: In object-oriented programming, when a derived class inherits from a base class, an object of the derived class may be referred to via a pointer or reference of the base class type instead of the derived class type. If there are base class methods overridden by the derived class ...

  3. Bridge pattern - Wikipedia

    en.wikipedia.org/wiki/Bridge_pattern

    The bridge pattern is a design pattern used in software engineering that is meant to "decouple an abstraction from its implementation so that the two can vary independently", introduced by the Gang of Four. [1]

  4. Composition over inheritance - Wikipedia

    en.wikipedia.org/wiki/Composition_over_inheritance

    The C++ examples in this section demonstrate the principle of using composition and interfaces to achieve code reuse and polymorphism. Due to the C++ language not having a dedicated keyword to declare interfaces, the following C++ example uses inheritance from a pure abstract base class.

  5. Visitor pattern - Wikipedia

    en.wikipedia.org/wiki/Visitor_pattern

    This example declares a separate ExpressionPrintingVisitor class that takes care of the printing. If the introduction of a new concrete visitor is desired, a new class will be created to implement the Visitor interface, and new implementations for the Visit methods will be provided. The existing classes (Literal and Addition) will remain unchanged.

  6. Abstract type - Wikipedia

    en.wikipedia.org/wiki/Abstract_type

    //By default, all methods in all classes are concrete, unless the abstract keyword is used. public abstract class Demo {// An abstract class may include abstract methods, which have no implementation. public abstract int sum (int x, int y); // An abstract class may also include concrete methods. public int product (int x, int y) {return x * y;}} //By default, all methods in all interfaces are ...

  7. Class (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Class_(computer_programming)

    [26] [27] In C++, an abstract class is a class having at least one abstract method given by the appropriate syntax in that language (a pure virtual function in C++ parlance). [ 25 ] A class consisting of only pure virtual methods is called a pure abstract base class (or pure ABC ) in C++ and is also known as an interface by users of the ...

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    search.aol.com

    The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

  9. Decorator pattern - Wikipedia

    en.wikipedia.org/wiki/Decorator_pattern

    A sample UML class and sequence diagram for the Decorator design pattern. [7] In the above UML class diagram, the abstract Decorator class maintains a reference (component) to the decorated object (Component) and forwards all requests to it (component.operation()). This makes Decorator transparent (invisible) to clients of Component.