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Jun 11, 2023 · A pure virtual function (or abstract function) in C++ is a virtual function for which we can have an implementation, But we must override that function in the derived class, otherwise, the derived class will also become an abstract class. A pure virtual function is declared by assigning 0 in the declaration.
Feb 9, 2024 · An abstract class is a class that either defines or inherits at least one function for which the final overrider is pure virtual. Explanation. 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).
What is an abstract class in C++? By definition, a C++ abstract class must include at least one pure virtual function. Alternatively, put a function without a definition. Because the subclass would otherwise turn into an abstract class in and of itself, the abstract class's descendants must specify the pure virtual function.
A class that contains a pure virtual function is known as an abstract class. In the above example, the class Shape is an abstract class. We cannot create objects of an abstract class.
Abstract classes act as expressions of general concepts from which more specific classes can be derived. You can't create an object of an abstract class type. However, you can use pointers and references to abstract class types.
Jun 10, 2024 · An abstract class in C++ is a class that cannot be instantiated on its own and is designed to be a base class for other classes. It contains at least one pure virtual function, which is declared by assigning 0.
Sep 6, 2023 · We can implement Abstraction in C++ using classes. The class helps us to group data members and member functions using available access specifiers. A Class can decide which data member will be visible to the outside world and which is not.
