Often asked: Can Pure Virtual Function Have A Body?

Pure virtual functions (when we set = 0 ) can also have a function body.

Can we have a body to pure virtual function?

Yes, it is possible to have pure virtual destructor. Pure virtual destructors are legal in standard C++ and one of the most important things to remember is that if a class contains a pure virtual destructor, it must provide a function body for the pure virtual destructor.

Can pure virtual function have definition?

A pure virtual function is a function that must be overridden in a derived class and need not be defined.

Can we create object of pure virtual function?

A pure virtual function or pure virtual method is a virtual function that is required to be implemented by a derived class if the derived class is not abstract. When a pure virtual method exists, the class is “abstract” and can not be instantiated on its own.

Can pure virtual function have arguments?

Yes, C++ virtual functions can have default parameters.

Can we call virtual function using object?

A virtual function is a member function that you expect to be redefined in derived classes. When you refer to a derived class object using a pointer or a reference to the base class, you can call a virtual function for that object and execute the derived class’s version of the function.

How do you make a virtual function a pure virtual function?

A pure virtual function is declared by assigning 0 in declaration.

Can not be a friend in C++?

You cannot define a class in a friend declaration. For example, the compiler does not accept the following code: class F; class X { friend class F { }; }; However, you can define a function in a friend declaration.

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What is pure virtual function in C++ explain with example?

A pure virtual function is a virtual function in C++ for which we need not to write any function definition and only we have to declare it. It is declared by assigning 0 in the declaration. If an Abstract Class has derived class, they must implement all pure virtual functions, or else they will become Abstract too.

Which of the following is true for a pure virtual function?

Which of the following is true about pure virtual functions? 1) Their implementation is not provided in a class where they are declared. 2) If a class has a pure virtual function, then the class becomes abstract class and an instance of this class cannot be created.

What is difference between pure virtual and virtual?

The main difference between ‘virtual function’ and ‘pure virtual function’ is that ‘ virtual function’ has its definition in the base class and also the inheriting derived classes redefine it. The pure virtual function has no definition in the base class, and all the inheriting derived classes has to redefine it.

Why we use pure virtual function in CPP?

A pure virtual function makes it so the base class can not be instantiated, and the derived classes are forced to define these functions before they can be instantiated. This helps ensure the derived classes do not forget to redefine functions that the base class was expecting them to.

Can constructor be pure virtual?

You can call member functions from a constructor or destructor of an abstract class. However, the results of calling (directly or indirectly) a pure virtual function from its constructor are undefined.

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What is Diamond problem in C++?

The Diamond Problem in C++, Solved The Diamond Problem is an ambiguity that arises in multiple inheritance when two parent classes inherit from the same grandparent class, and both parent classes are inherited by a single child class.

What is the syntax of pure virtual function Mcq?

Which is the correct syntax of defining a pure virtual function? Explanation: virtual return_type function_name(parameters) = 0; where {=0} is called pure specifier. 4.

Can abstract class have constructor C++?

Can it have constructor? Yes it can and the purpose is to initialize local variables from the base class. You should avoid using public constructor in Abstract and use protected only.