Create object of abstract class in c pdf

Step 1 as a first step, lets create an abstract class. You cannot create an object of an abstract class type. An abstract class contains at least one pure virtual function. The abstract modifier can be used with classes, methods, properties, indexers, and events. It is a userdefined data type, which holds its own data members and member functions, which can be accessed and used by creating an instance of that class. The class will be called tutorial and will just have one method. Abstract classes act as expressions of general concepts from which more specific classes can be derived. An abstract class is a class that is designed to be specifically used as a base class. This is used to denote that the class is an abstract class. You declare a pure virtual function by using a pure specifier 0 in the declaration of a virtual member function in the class declaration. This example works because the implementation of the static factory method will be creating a derived class.

The abstract modifier indicates that the thing being modified has a missing or incomplete implementation. A pure virtual function is declared by assigning 0 in declaration. A class that contains at least one pure virtual function is considered an abstract class. A class is used to specify the form of an object and it combines data. Inspect the actual runtime type of the object returned by the method in the debugger and you will see. Before and after back to abstract factory description. Trying to maintain portability across multiple platforms routinely requires lots of preprocessor case statements.