![]() Public : virtual int cal_Area() = 0 // cal_Area is a pure virtual function Welcome to FavTutor #include using namespace std Given below is the way to declare the pure virtual functions in C++ : Now we know theoretically, what are important points to keep in mind about the pure virtual functions to define, then let's just quickly have a look at its syntax as well. Note that classes having at least one pure virtual function are called Abstract classes. The derived class must provide the implementation code for this function, else this derived class is also termed an 'abstract class'.'0' must be assigned to the function to make them pure.In the base class, you can declare it, but you cannot implement it.These functions also must have a prefix before the function's name called 'virtual'.In this way, the base class becomes an abstract class, and it must be inherited by a derived class, which provides an implementation for it.īasically, they have the following characteristics: What is a Pure Virtual Function in C++?Ī pure virtual function in C++ is a function that is declared in the base class but you cannot implement it, with a '0' assigned to make them pure. In this article, we will look actually what are pure virtual functions in C++ with examples and advantages. Following from right, we know about functions, and "Virtual" means virtual keyword which we use to achieve late binding as we implement it in virtual functions. Look at this equation: Pure Virtual Functions = Pure + Virtual + functions.
0 Comments
Leave a Reply. |