A virtual function allows derived classes to replace the implementation provided by the base class. The compiler makes sure the replacement is always called whenever the object in question is actually of the derived class, even if the object is accessed by a base pointer rather than a derived pointer…. Continue reading
A copy constructor is a method that accepts an object of the same class and copies it’s data members to the object on the left part of assignment: class Point2D{ int x; int y; public int color; protected bool pinned; public Point2D() : x(0) , y(0) {} //default (no argument)… Continue reading
Polymorphism is the ability for an object to change its behavior according to how it is being used. Where an object’s class inherits from a super-class or implements one or more interfaces, it can be referred to by those class or interface names. So if we have a method that… Continue reading
It extends the benefits of metadata by allowing developers to inspect and use it at runtime. For example, dynamically determine all the classes contained in a given assembly and invoke their methods. Reflection provides objects that encapsulate assemblies, modules, and types. You can use reflection to dynamically create an instance… Continue reading
Inheritance is an interesting object-oriented programming concept. It allows one class (the sub-class) to be based upon another (the super-class) and inherit all of its functionality automatically. Additional code may then be added to create a more specialized version of the class. In the example of vehicles, sub-classes for cars… Continue reading
Templates allow to create generic functions that admit any data type as parameters and return value without having to overload the function with all the possible data types. Until certain point they fulfill the functionality of a macro. Its prototype is any of the two following ones: template function_declaration; template… Continue reading
There are situations where multiple inheritance is the best (if not the only) choice when designing a certain model for our program or project. C# unfortunately does not support multiple inheritance and so we must look for ways to adapt our design to make possible its implementation. But C# does… Continue reading
Fly weight pattern is useful where we need to create many objects and all these objects share some kind of common data. Consider figure ‘Objects and common data’. We need to print visiting card for all employees in the organization. So we have two parts of data one is the… Continue reading
Many times two classes are incompatible because of incompatible interfaces. Adapter helps us to wrap a class around the existing class and make the classes compatible with each other. Consider the below figure ‘Incompatible interfaces’ both of them are collections to hold string values. Both of them have a method… Continue reading
Visitor and strategy look very much similar as they deal with encapsulating complex logic from data. We can say visitor is more general form of strategy. In strategy we have one context or a single logical data on which multiple algorithms operate. In the previous questions we have explained the… Continue reading