Table of Contents
- 1 Can we create object of pure virtual class?
- 2 Can we create object of virtual class in C++?
- 3 What is the correct way to declare a pure virtual function in C++?
- 4 What is the correct way to declare a pure virtual function in C ++?
- 5 What is the proper way to declare pure virtual?
- 6 How would you create a pure abstract class in C++?
- 7 What is a pure virtual function?
- 8 Why do we need a pure virtual destructor in C++?
Can we create object of pure virtual class?
Pure Virtual definitions Still you cannot create object of Abstract class. Also, the Pure Virtual function must be defined outside the class definition. If you will define it inside the class definition, complier will give an error. Inline pure virtual definition is Illegal.
Can we create object of virtual class in C++?
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. We can’t create object of abstract class as we reserve a slot for a pure virtual function in Vtable, but we don’t put any address, so Vtable will remain incomplete.
Does pure virtual function have return type?
Yes. The return types are allowed to be different as long as they are covariant.
When we do make a virtual function pure What are the implications making the function as pure virtual function?
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.
What is the correct way to declare a pure virtual function in C++?
Q) Which is the correct declaration of pure virtual function in C++ virtual void func() = 0; is the correct declaration.
What is the correct way to declare a pure virtual function in C ++?
A pure virtual function is declared by assigning 0 in declaration.
Can we create object of abstract class in C++?
We cannot provide implementation of function draw() in Shape, but we know every derived class must have implementation of draw(). Similarly an Animal class doesn’t have implementation of move() (assuming that all animals move), but all animals must know how to move. We cannot create objects of abstract classes.
Can you implement pure virtual function C++?
C++ Supports pure virtual functions with an implementation so class designers can force derived classes to override the function to add specific details , but still provide a useful default implementation that they can use as a common base.
What is the proper way to declare pure virtual?
Discussion Forum
Que. | Which one of the following is the correct way to declare a pure virtual function? |
---|---|
b. | virtual void Display = 0; |
c. | virtual void Display(void) = 0; |
d. | void Display(void) = 0; |
Answer:virtual void Display(void) = 0; |
How would you create a pure abstract class in C++?
You create an abstract class by declaring at least one pure virtual member function. That’s a virtual function declared by using the pure specifier ( = 0 ) syntax. Classes derived from the abstract class must implement the pure virtual function or they, too, are abstract classes.
Which is the correct way to declare a pure virtual function in C++?
What are pure virtual functions and abstract classes in C++?
Pure Virtual Functions and Abstract Classes in C++. Sometimes implementation of all function cannot be provided in a base class because we don’t know the implementation. Such a class is called abstract class. For example, let Shape be a base class.
What is a pure virtual function?
A pure virtual function is implemented by classes which are derived from a Abstract class. Following is a simple example to demonstrate the same. 1) A class is abstract if it has at least one pure virtual function. In the following example, Test is an abstract class because it has a pure virtual function show ().
Why do we need a pure virtual destructor in C++?
Why do we need a pure virtual destructor in C++? 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. An abstract class is a class in C++ which have at least one pure virtual function.
How can a class become a virtual base class?
Explanation : The class A has just one data member a which is public. This class is virtually inherited in class B and class C. Now class B and class C becomes virtual base class and no duplication of data member a is done.