Abstract Class As Parameter C

An abstract class is designed to be derived from.

Abstract class as parameter c. Consider the example presented in virtual functions. You can pass an animal pointer or reference to the method. That means a reference or pointer to the base should be used. Abstract classes are used to represent general concepts for example shape animal which can be used as base classes for concrete classes for example circle dog.

The liskov substitution principle roughly states that anything that uses the abstract parts of types derived from an abstract base should work equally well using the base polymorphically. Classes derived from the abstract class must implement the pure virtual function or they too are abstract classes. You cannot use an abstract class as a parameter type a function return type or the type of an explicit conversion nor can you declare an object of an abstract class. If an class contains atleast one pure virtual function speak then the class becomes an abstract class and you cannot create any objects of it.

Abstract class and pure virtual function in c. A pure virtual function is declared by assigning 0 in declaration. See the following example. The way this concept is expressed in c is to have the member function declaration assigned to zero.

The intent of class account is to provide general functionality but objects of type account are too general to be useful. We cannot create objects of abstract classes. A pure virtual function or abstract function in c is a virtual function for which we dont have implementation we only declare it. A class that contains at least one pure virtual function is considered an abstract class.

Abstract classes are used to provide an interface for its sub classes. Therefore account is a good candidate for an abstract class. You can however declare pointers and references to an abstract class. An abstract class is one in which there is a declaration but no definition for a member function.

Answered feb 16 11 at 1631. No objects of an abstract class can be created except for base subobjects of a class derived from it and no non static data members of an abstract class can be declared.