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c++ inheritance Exams 2024
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c++ inheritance Exams 2024
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c++ inheritance Exams 2024define a copy constructor or assignment operator for a class that contains a pointer to
ABC - ANS-USE A virtual constructor
EXAMPLE non-virtual function of the base class to call a virtual function? - ANS-void
Shape::print() const
float a = this->area(); // area() is pure virtual
Explain use of Private Inheritance
The use of public inheritance implies an is-a relationship between a base class and its
descendant. Unlike public inheritance, private inheritance is used when you want to
inherit the implementation of the base class without the is-a commitment. -
ANS-aggregation(CAN)and containment(CAN-NOT)?
Aggregated object can exist without container. Composited object is managed by it's
container and cannot live without it. Interviewer would probably expect that you will say
that composition implemented by creating object by value and aggregation implemented
by creating object by reference (or pointer)
Private inheritance models the "is implemented in terms of a" relationship, rather than
the is-a relationship that is modeled by public inheritance.
Private inheritance results in all public functions of a class being inherited as private
functions
Private inheritance should be used sparingly, but can be necessary when you need to
override a virtual function
Explain use of Private Inheritance - ANS-prevent class inheriting
1.make the class's constructors private and to use the Named Constructor Idiom
2.virtual inheritance.
How do I separate interface from implementation in C++ - ANS-An abstract base class.
how to define a "virtual constructor"? - ANS-effect of a virtual constructor by a virtual
clone() member function (for copy constructing), or a virtual create() member function
(for the default constructor).
virtual Shape* clone() const = 0; // The Virtual (Copy) Constructor
How to implement Named Constructor - ANS-declare all the class's constructors in the
private or protected sections, and you provide public static methods that return an
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