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C++ Abstract classes and pure virtual functions
/* * Abstract class: A class which does not contain implementation. * * abstract class must have at least one pure virtual function. * * Pure virtual function: It does not have body. * Syntax: * virtual void function_name(argument_list) = 0; * * C++ is supporting pure virtual destructor as well. However, this * is different from pure virtual function. Because, pure virtual * de s tructor must have function body. * */ #include <iostream> using namespace std; class Animal { public: virtual void run() = 0 ; virtual void speak() = 0 ; // virtual destructor is recommended if there is any // virtual function in a class virtual ~ Animal() { } }; class Dog : public Animal { public: virtual void speak() { cout << "Woof!" << endl; } }; class Labrador : public Dog { public: Labrador() { cout << "New Labrador" << endl; } virtual void run() { cout <...
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