Last lecture on OOPS

1.
OOPs – Advanced

2.
OOPs – Const Dest
●
Constructor : Things to do when a new
object is created
●
Destructor : Things to do when object's life
ends.

3.
OOPs – Const Dest

4.
OOPs – More Constructors

5.
OOPs – More Constructors :
ERRATA

6.
Lets answer the TRICK Question

7.
Lets do the TRICK Question
15 years back, before C++ came in,
Address(cool) = Address(coolness)
COMPILER OPTIMIZATION!

8.
Lets answer the TRICK Question
●
While making a COPY of the parameter, the
Copy­constructor of the parameter should
be called!
●
Thus the compiler optimization was invalid.

9.
OOPs – Interfaces
●
Class definition, no logic
●
Defines what functions and data (vars)
should be present in the Class that
IMPLEMENTS an interface.
●

10.
OOPs – Interfaces

11.
OOPs – Interfaces

12.
OOPs – Abstract Class
●
Small extension of Interfaces
●
Instead of requiring subclass to implement
ALL virtual functions, it also defines some
function's body.

13.
OOPs – Abstract Class

14.
OOPs – Virtual keyword
OUTPUT for each?

15.
OOPs – Virtual keyword

16.
OOPs – Static Variables

17.
OOPs – Static Variables

18.
OOPs – Inline functions

19.
OOPs – Friend Function
PS: Never encountered a good use for a friend function :­/

20.
OOPs – Static Var and Function
Output?

21.
OOPs – Static Var and Function

22.
OOPs – Namespace

23.
OOPs – Namespace

24.
OOPs – Namespace

25.
OOPs – Namespace

26.
OOPs – Shallow Copy
Output?

27.
OOPs – Shallow Copy

28.
OOPs – Deep Copy
Output?

29.
OOPs – Deep Copy

30.
Inheritance ­ advanced
●
Types of inheritance :
●
Public
●
Private
●
Protected

31.
Inheritance ­ advanced
●
Types of inheritance :
●
Public
●
Private
●
Protected

32.
Inheritance ­ advanced
●
Types of inheritance :
●
Public
●
Private
●
Protected

33.
CLASS DIAGRAM
READUP : UML Elements

34.
QUESTIONS

35.
Q) Variables
●
What is the size of a NULL value in C++?

36.
Q) Variables
●
What is the size of a NULL value in C++?
●
1 Byte

37.
Q) Functions
●
Python uses which of the following?
●
Call by value
●
Call by reference
●
Both, interchangeably
●
None of the above

38.
Q) Functions
●
Python uses which of the following?
●
Call by value
●
Call by reference
●
Both, interchangeably
●
None of the above : It uses Call­by­object

39.
Q) C'tors and d'tors
OUTPUT?

40.
Q) C'tors and d'tors

41.
Q) This pointer
What is the error here?

42.
Q) What are the OOPs conepts
used here?

43.
Q) Inheritance
WHAT VARIABLES ARE ACCESSIBLE
TO
Function foo() ?

44.
Q) Inheritance
WHAT VARIABLES ARE ACCESSIBLE
TO
Function foo() ?
a_v1, a_v2, b_v2, b_v3, c_v2, c_v3
WHAT VARIABLES ARE ACCESSIBLE
TO
Object d?

45.
Q) Inheritance
WHAT VARIABLES ARE ACCESSIBLE
TO
Function foo() ?
a_v1, a_v2, b_v2, b_v3, c_v2, c_v3
WHAT VARIABLES ARE ACCESSIBLE
TO
Object d?
a_v2, c_v3

46.
Q) This pointer
What is the error here?

47.
Q) Interfaces and Abs Class
●
Can you instanciate an object of an Abstract
class?

48.
Q) Interfaces and Abs Class
●
Can you instanciate an object of an Abstract
class?
●
NO

49.
Q) Interfaces and Abs Class
●
Can a function be final and virtual at the
same time?

50.
Q) Interfaces and Abs Class
●
Can you instanciate an object of an Abstract
class?
●
NO
– Virtual functions HAVE to be over­ridden
– Final functions CANNOT be over­ridden