Private Base
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Private Base
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One of the most important concepts in object-oriented programming is that of inheritance. Inheritance allows us to define a class in terms of another class, which makes it easier to create and maintain an application. This also provides an opportunity to reuse the code functionality and fast implementation time.
When creating a class, instead of writing completely new data members and member functions, the programmer can designate that the new class should inherit the members of an existing class. This existing class is called the base class, and the new class is referred to as the derived class.
The idea of inheritance implements the is a relationship. For example, mammal IS-A animal, dog IS-A mammal hence dog IS-A animal as well and so on.
A class can be derived from more than one classes, which means it can inherit data and functions from multiple base classes. To define a derived class, we use a class derivation list to specify the base class(es). A class derivation list names one or more base classes and has the form −
Where access-specifier is one of public, protected, or private , and base-class is the name of a previously defined class. If the access-specifier is not used, then it is private by default.
Consider a base class Shape and its derived class Rectangle as follows −
When the above code is compiled and executed, it produces the following result −
A derived class can access all the non-private members of its base class. Thus base-class members that should not be accessible to the member functions of derived classes should be declared private in the base class.
We can summarize the different access types according to - who can access them in the following way −
A derived class inherits all base class methods with the following exceptions −
When deriving a class from a base class, the base class may be inherited through public, protected or private inheritance. The type of inheritance is specified by the access-specifier as explained above.
We hardly use protected or private inheritance, but public inheritance is commonly used. While using different type of inheritance, following rules are applied −
Public Inheritance − When deriving a class from a public base class, public members of the base class become public members of the derived class and protected members of the base class become protected members of the derived class. A base class's private members are never accessible directly from a derived class, but can be accessed through calls to the public and protected members of the base class.
Protected Inheritance − When deriving from a protected base class, public and protected members of the base class become protected members of the derived class.
Private Inheritance − When deriving from a private base class, public and protected members of the base class become private members of the derived class.
A C++ class can inherit members from more than one class and here is the extended syntax −
Where access is one of public, protected, or private and would be given for every base class and they will be separated by comma as shown above. Let us try the following example −
When the above code is compiled and executed, it produces the following result −
c++ - Cannot cast "derived" to its private base class... - Stack Overflow
C++ Inheritance - Tutorialspoint
POF Private - Base 1 - YouTube
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