Hi guys, one more thing I should have mentioned is that of methods are virtual, only then they need to be added in VTable and so the promote method should also be marked virtual in the example. Thanks for pointing this out in comments! 😊😇

Ma'am please continue your C++ series, it's really helpful and unique. There are very limited tech creators talking about C++ at the level you are explaining the concepts.

Best video on runtime polymorphism on yt, highly underrated. Your example made it a lot clear.

Thank you for explanation. This is the only video from where we can understand clearly about VT and VP

I was looking for this concept all over the internet and i couldn't get it with much detailed explanation. Thanks Keerti

Finally someone bring unique content...Thanks a ton!!!

Ton of thanks to you Keerthi pls continue this series..awaiting for new videos

Thank you so much ma'am for this concept. It became crystal clear just before my interview. Thanks a lot.🥰🥰

such a nice explanation!!! great job thanks for wonderful explanation

I tried to understand VTable from gfg and other sites. Finally got the video which explained it simply. Your efforts are worth it. Great Job !

I was looking for this for some time now, thanks!

DII please continue this SERIES naa.. its really very helpful.. bcz theses are some underlying concepts which you know that are imp for us to know but we as students are unaware and hence miss them will studying....plz continue this series of interview ques

Summary Virtual Function IMP: A virtual function is used to replace the implementation provided by the base class. The replacement is always called whenever the object in question is actually of the derived class, even if the object is accessed by a base pointer rather than a derived pointer. 1. A virtual function is a member function which is present in the base class and redefined by the derived class. 2. When we use the same function name in both base and derived class, the function in base class is declared with a keyword virtual. 3. When the function is made virtual, then C++ determines at run-time which function is to be called based on the type of the object pointed by the base class pointer. Thus, by making the base class pointer to point to different objects, we can execute different versions of the virtual functions. Key Points : 1. Virtual functions cannot be static. 2. A class may have a virtual destructor but it cannot have a virtual constructor.

Your way of teaching is good. Finally I can understand what virtual table and virtual pointer. Thanks

What makes the audience more happy: 1. Great Explanation (that indeed it is :) ) 2. Notes(not provided here) (drive pe uploaded)

Probably the most precise explanation I came across on the topic. Thank you 😊

Explained in very easy language that a beginner can understand as well. Please upload more videos on similar topics.

such a detailed and easy to understand explanation. loved it :)

Great Video..continue the series

Thankyou ma'am, for clearing out the query that even G4G couldn't explain properly.

You are great, thank you !

Thanks for explaining this difficult topic

Like the way you say that Hi guys by waving that hand in certain fashion. Feels comedy but nice 😂🤣👍

This video is really very informative . Best video about vtables . Please make a video regarding some tricky questions & answers around virtual func , vptr,vtable

Really great explanation. Keep going

awesome continue your series.

Thankyou for starting this series. Very well explained 😊

thanku ma'am for the valuable information it helps us alot

Quite a comprehensive treatment of the topic. This series might rival Yan Chernikov's C++ playlist and possibly outshine it. Well done!

explanation was really good thanks for sharing 🙏

Super helpful thank you!

I used to be always confused no matter how much I read. Thanks Keerti for clarifying it!!

Excellent explanation 😄

Learnt something really cool today, looking forward to more videos in this series 😇

very detailed explanation thank you so much

Thank you very much for the awesome explanation

great teaching skills. thank you,

Keerti, could not explain that how much your videos and your presentation affects a lot of people. Just sending you best wishes and loads of love !!! Keep up good work dear.... may all your wishes come true... because it is full of honesty and dedication....

You've earned my subscription.

Love this idea, please upload more!

Underated. U explained too well. Thanks

Thanks Needed This Series🔥🔥

great explanation!

I never used to get this 😭, but now you started a series thanks 😊.

Good content. Thank you!

Keerti never fails to make things easy.

subscribed after watching content's quality :)

Make more videos on c++ interview...u give a good job mam

More videos in C++, please.

Nicely explained ma'am. If possible can you make videos on other OOPS interview questions too?

Used a very good example.

Great explanation 🔥

it was a great tutorial.

Thankyou 🙂

Plzzz continue this series

Can you please create videos on some other cpp concepts like Special pointers, Multithreading in cpp, Casting, Thanks in advance 😊

thank you.

Plz continue the course.

Great Video

Awesome explanation. Doubt : is vtable inside the class or not ?

Thanks 😊

Nice explanation

Hi , The lecture is awesome. Just need a confirmation, The vtable only contains virtual function pointers (as i see promote is not a virtual function but still added in vtable) ? Can you please confirm on this one?

Hi mam, your lectures are really awesome with crisp and clear explanation. Can you suggest some book which we should follow to study some of topics like these in depth in C++. (I don't want to learn syntactical things. But I'm interested in how things work internally)?

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5:57 The vtable stores pointers for virtual functions only. In this case, Emp::vtable will only store Emp::RaiseSal(). Emp::Promote() will undergo compile time binding. Please correct me if I am wrong.

Thanks for the clarification about VPtr and Vtable.I have some queries below: 1. when we say late binding is happening at run time. How it is happening actually? 2. If one derived class e.g child is derived from two base classes e.g. Dad and Mom . In this case both vptr will be derived in child class if yes, then how it will resolved at run time. Thanks

Ma'am does vtable of a given class has function poiters to all the functions(virtual/non virtual) present in the class or vtable has gives memory to only to function pointers of virtual functions

Thanks for the explanation!! I have a question. AFAIK, VTable would comprise of pointers to Virtual functions only. In the Video, In Emp class, you marked "raise salary" method as Virtual but not "Promote" method, so I think Emp class's VTable would only contain a pointer to "raise salary" method ? Could you please clarify on this ? As you started with Virtual keyword, in the next video could you please cover Virtual Inheritance along with Virtual Constructors and Destructors ?

I have question since I'm new to the C++. Does vtable gets created by default by the compiler even without virtual keyword declared either in base or derived class for a member function?

@Keerti Purswani The concept is clear but why the virtual table pointer is not affected when copy or assigning operation is performed? Example: Emp* emp = new Engineer(); // is valid Emp emp = Engineer(); // virtual table pointer is not affected Usually the address of the pointer is copied. So, it is the virtual table pointer an exception?

thanks

Thanks for good explanation... I got the idea that vtable is static array and it gets created at compile time... Also Vtable gets created per class involving one virtual method directly or indirectly Question is about what happens at run time ? Is it like vptr of object gets associated at run time ?

Hi, Can a poymorphic funtion be able to access child class variables when called using base class pointer?

Sister, can you make a brief detailed video on pointers fully :) ? Thank you

Hi @KeertiPurswani, As far as i know vtable does not contain non virtual function. vtable is created only for virtual functions.

A Short an easy crash course video on VTFs 💯. Let's say there are 2 classes A and B and they are inherited, and we are making some functions virtual bcz we are doing function overriding . so how many vptr will be Assigned by compiler ? I meant will both v tables will be Assigned by two respective two vptr !! OR only 1 vptr is made and that only is inherited and so on... Actually got confused a bit that's why 😅

Hii i want to understand why we need to use base class pointer to call derived methods instead i can have dervied object for calling derived methods please help me with this

How would this work with multiple inheritance? Will the derived class have multiple vptrs? And if so, how does the compiler know which one to dereference?

How does VTable handles situation if we have a non virtual function in base and a same name function in a Derived class as well ? Will VTable of derived class still point to base function ?

Vptr secretly inserts a pointer in constructor of base class that points to v table of base class.. Derived class also gets vptr in constructor of derived class because of inheritance.. So now derived vptr pointing to vtable.. How exactly compiler calling the derived class function only.. Both vptr pointing to V tables right?

Great explanation, thanks. Unfortunately, audio quality is not so good (saturating), although you used a mic.

I think still many things are left in this Video...I would say please do some coding and try to create an object and do some dissection on object and try to locate vptr inside object memory and then try to locate vtable address inside object memory and then try to locate virtual fuctions address...then full clearity will come ....

how vtable are organized in multihineritance ??

V table is a static array..When u say all objects are pointing to the same vtable.. Means it will point to base vtable or derived class vtable?

What if two functions have virtual in base class how many vptr will create ?

If we have n number of class object, then how many virtual pointers will be there can you explain it. Thanks

VTABle will have pointers to the virtual functions only right ? not the pointers to the normal function

please explain can virtual functions be static ? i am not able to understand by watching the vedio

If vptr and vtable are part of class, then what are their type?

Key Idea: When "virtual" is used, function will be called based on object type not the pointer type.

Ma'am i'm preparing for cognizant GenC next interview, can you suggest me something please, I'm nervous af. Also, I'm not that good in logic building... so m just unable to solve problem, RECURSION DP DSA are way too difficult for me. Also Do i need to revise OS, networking etc for it.....

Commenting for youtube algo😁❤️

what is the use of pure virtual function? void fun() =0

vtable me sirf virtual functions jaate h since promote is not a virtual function it will not go in the tables

why virtual fn cant be static??

As Promote is not a virtual, why do we have entry for it in Vtable?

why it is static array , not dynamic array for vTable?

so for an engineer variable, I would do Eng* eng = new Eng(); instead of Emp* eng = new Eng(); so I can access the engineer class's Raise salary method. so i guess what i am asking what is the good use of a virtual function?

I am unable to understand why virtual functions can't be static? Can anyone help me out with this.