Virtual Functions

Virtual Functions Concept explained easily with diagrams.

[deuduttanagori]

Excellent explanation. Virtual functions are used in system. verilog too. This clears a lot of doubts

[voidzero]

Great Explanation sir... thoroughly understood virtual functions... Thank You!!!

[yuka]

Thank you, sir, very clear and concise. Other videos on Youtube are usually more than half an hour but not touching the main idea of the virtual functions.

[sharvilshah]

Excellent explanation..I went on different videos to understand virtual functions but your explanation was best...very clear.

[jayanthibalasubramanian]

Very clearly explained. I strongly feel you should do more videos in C++ and put up your notes in a site accessible to the public.

[bbshabarinath]

super sir....great work with real time

[jintao]

Thank you a lot for being so clear and helpful!

[abisheksindhe]

Good work Sir...Very nice explanation.

[pavanpongle]

Hi can you please confirm whether vtable created per class or per object, it should be per class, as vtable has only function pointers,

[Mr.Kaduru]

thanks it is very useful for beginners.

[nanerakesh]

Good Explanation and expecting .NET framework explanation in the upcoming days

[Cadenza]

Awesome explanation !! You should be doing more videos for your clarity of teaching :)

[AbhishekKumar-imxd]

Sir, 14:08 example
What will happen if in class shape: virtual void Draw() =0;//pure virtual function.
Will your program still run because we are creating here an object of abstract class(which contains pure virtual function)???

[vijaykumarkari]

thanqq sir, , , it really help us to understand

[HARI-jsgk]

i have a doubt sir
what will happen if class D1 has 1 more function like:
public:
virtual void function1(int x){}
is it method hiding?
and, what will be the entry in D1 Vtable ?

[openembeddedworkshop]

Sir, I think there is a flaw in your explanation. At 10:08 you said every object will have a virtual table (vtable) which isincorrect.
vtable is per class basis (only in class containing virtual functions). Whereas virtual pointer (vptr) is per object/instance basis of the class (containing virtual functions). That is instance contains pointer to vtable (vptr).
If vtable was constructed per instance/object basis then memory usage will increase greatly compared approach of just creating a pointer to virtual table.

[utkalikasamal]

Its very helpful...I have a doubt that how vptr get involved with each object while calling a virtual function?

[govindrao]

Hi Ashwin, can please explain about base class *vptr and Derived *Vptr(inharied) ?

[kartikpodugu]

virtual pointer and virtual table concepts are not very clear sir. understood what is happening, but didn't understand why it is happening.

[camel]

Why do we need pointers to base class? And further why would we need the parent to control the derived class function redefinitions.  Why not just use the derived class objects to control their redefined functions by themselves?