There's no such thing as "minimal impact" in my opinion, there's impact or no impact. I'd rather avoid impact altogether. :P

Brief explanation of uncovered topics (yet) in this video: Since strings is not a primitive type of C++ we need to import the header #include To use string without namespace std is like this: std::string MyString("hello") This is equivalent to: std::string MyString = "Hello" Pointer instances: new keyword returns a pointer std::string* MyString = new std::string("Hello") And if is a pointer you access their properties with -> instead of a dot (.) std::cout length()

For the newcomers, my suggestion would be to watch "stack vs heap memory in C++", "how to create/instantiate objects in c++" and "the new keyword in c++" before watching this.

My English captions: "my name is HMO and welcome back to my syphilis gloss series".

By far the best channel on youtube to learn anything about c++! Thanks a lot cherno!

Beautiful set of tutorials. Probably the best I've seen so far for any programming language. I also like how it is divided into the different episodes that you can watch whenever you are only interested in a specific topic. Thank you for your time and please keep going like this!

You are the best Cherno. I am visiting your c++ series regularly. Basically when I run into a concept I need to get familiar with on the go :D

One of my lecturers actually went and dissembled the function calls for a Virtual function and for non-virtual functions for us to look at. The Normal function call executed 4 assembly instructions where as the Virtual function call executed 6, the additional 2 were dereferencing the pointer to the function pointer in the Vtable and then dereferencing the function pointer in the Class-specific function list. The overhead of 2 extra x86 instructions is next-to unnoticeable compared to the penalty of setting up a new stack-frame (which you have to do for both anyway) so the performance hit really in negligible.

This is short and beautiful, man! Please, continue doing what you do now

Gotta say this video helped me understand virtual functions a lot more than anything else so far. Going to have to hunt down the other things that confuse me. I've been following a C++ tutorial app at work during breaks and such and these were stumbling blocks that undermined my whole understanding of polymorphism.

Very nice explanation. Short and right to the point. It's easy to agree with your assessment that v-tables have such minimal cost that the inconvenience of not using them makes using them a no-brainer. Thank you very much!

Figured id give you a thumbs up your 30 second explanation of what a virtual function does explained what my teacher could not do in 2 hours. Appreciate it sir.

Most of the time I've seen a tutorial about virtual functions/vtables it works pretty well to make some diagrams on paper about how it works because it's such an abstract concept that in general people, especially newbies, find a hard time trying to understand what's happening under the hood.

Virtual functions at first seemed harder than pointers for me... You've simplified it so elegantly... Thank you :)

Hey. Thank you so much! Had been waiting for this :)

good videos, keep it up. so glad you dropped the backgroundmusic

Thank you! You explained VTable so easily. I can continue my Reverse Engineering tutorials in peace now. Keep up the good work!

Guests: That's a very nice sofa, how comfy is it to sit on..? Cherno: No, it's just for the Aesthetics, I sit on the ground.

This was perfect! Thank you 💕

I'm working on an assignment and this is so helpful, thanks so much!

Thanks for this - excellent refresher, and I learned a few new tidbits! Keep these coming.

Haha loving the "is he going to be in focus or not?" game I'm playing watching through these videos 😂 such an epic series though mate, thanks!

Thanks for your video. One thing I could add for virtual keyword is to add this keyword on destructor of the parent class to prevent memory leak when a derived class is deleted through the parent pointer.

You a life saver. keep up the good work!

thank you, i always come back to reference your videos.

tysm! every topic you explain is so clear and simple

TheCherno, thank you for your great tutorials! Are you planning on making a tutorial on generic programming and C++ templates?

Your videos are amazing tools for learning this stuff.

Cherno, you are an absolute legend!

Excellent explanation. Something I'm looking for. Thank you so much.

Good stuff. Knew and used virtual functions already and funnilly enough I already learned this morning about the word "override" (also spoiler alert: final and volatile classes/member functions :O so much to learn!).

Love u dude

Dude ! You are wonderful, you are smart not to explain unnecessary stuff. Explain the important things and other important related aspects ! wow ..

To better understand his code, go through these topics first: 1. String Class 2. Initialisation list 3. Arrow Operator 4. New keyword

Let me tell you, I've been going to school for Software Engineering, and I have taken a bunch of different languages. Not a single one of them I really understood, just got it well enough to pass the class. But ever since I've found your CPP series, it's really helped, and I think I finally "get" it. This is the first language where I'm able to code without having to look up the solution 5 minutes into trying. Thank you for this series!

Please make a video on V Table and Memory allocation. I have been watching C++ playlist, your videos are very good to get concepts more clear.

It is the luckiest moment in this year that i found these series right after i started learning cpp

Its was a very good and technical explanation, thank you.

what a wonderful tutorial! Love it!

Hey Cherno! Got to say great channel to learn c++, awesome channel to get used to the australian accent!! :)

Dude you are great at explaining these things. Probably won't ever see this comment but thank you. I don't write comments a lot but I am teaching myself c++ and I've watched several of your vids and they are awesome and extremely helpful. Thanks again!

Super easy explanation. Many thanks mate

this is virtually the best tutorial on youtube (:

In 2:10 an entity pointer is pointing to a memory area assigned to a player object. It will get converted this way: Entity *e = (class Entity*)p; Great video!

Thank God for these videos. My professor is super chill, but he's so bad at explaining things. He reads the book at us and then explains things as though we already know it and moves way too fast and gets way too complicated.

awesome video man

If you're confused by this video and the next video... come back to it after watching more of his videos in the playlist. They are a bit out of order.

thanks Cherno

Great explanation

Super helpful gosh

A+ video. Very helpful.

In Bjarne's book he states the cost of a vtbl as two memory accesses plus the function call, exactly. The vtbl is just a collection of pointers to pointers. Two accesses is proportionally huge for some special cases and totally insignificant for others.

Personal notes: - Virtual functions help us to override functions in subclasses - Normally, without virtual functions, when you call a fucntion, that funtion is called according to the type the variable is declared, not according to the real type that variable points to(see video) - Virtual function helps you to call the proper fucntion, not according to the declared type, but according to the actual type it points to - Override keyword is used to specify that that function overrides another func in base class(u don’t have to use though)

Nice video, thanks bro

6 years later and I am still waiting for your VTable Video Cherno. 😆 I love your series. Please link me to the vtable video if there is one.

Thank You!!

I don't know if I particularly like the fact that the override keyword comes after the function signature. I come from C#, so it's strange to look at.

So many new concepts in this video, I wish you would just explain them quickly lol. All the other videos have been perfect. Thanks though.

this is the best

Excellent

This is really complicated for me a new learner.

After surfing the internet for more than 10 minutes, and this tutorial was much more helpful.

Awesome video as always Yan. I know for the general use of virtual functions this video is absolutely enough, but I would love to see an explanation of how early and late binding comes into play with these functions and the concept of a vtable. Thanks!

u save me dude thank you so much !!!!!!!

Great video!

you are genius

1. Virtual function: declared in the base class, which enables the derived object to use its override function. 2. Override: declared after the function in the derived class. not required, but avoid misspelling the function name or overriding the non-virtual function in the base class. 3.V Table : stores the virtual function in the base class to dispatch, which cost space, int * pointer to the override function. 4. in specific embedded systems, using v table might impact the performance .

-> in c++ ~~~ An operator in C/C++ allows to access elements in Structures and Unions. It is with a pointer variable pointing to a structure or union. The operator is formed by using a minus sign, followed by the geater than symbol as shown below but bro we didn't reach union yet

If I was new to this I would have struggled to understand. Your explanation is very good but it is impossible to pause the video to see all code to be able to imagine this scenario. It would be nice to have this simple code all on the screen and then You explaining it. In Your video, You jumping between screens and this create a lot of confusion for all newbies I imagine. Maybe a smaller font :) ..the point is If I explaining this to anybody I Print the example code on a single page and then explain, If I jump pages from declarations to the main function this is very confusing ...but this is just me ...Anyway I like Your videos Regardless :) Regards

Türkçe altyazı ekleyenin eline sağlık. Thanks to the contributor for the Turkish subtitles.

Okay Cherno... we get it... we are dumb. You happy now? Guess I'll just have to watch more of your videos to understand these unexplained concepts, which I was going to anyways because you're the best teacher ever. :D

This series Applies in 2022 Meets the standards for my school's conventions (industry standards) Is more articulate and understandable than the "C++ For Dummies" series Has a loving/lovable character directing it I (with next to no rep or qualifications) award the Cherno with best C++'s best resource award I said it here Now I'm going to say it everywhere else.

2:39 that resignation in his voice lmao

Your hair reminds me of that scene in There's Something About Mary. You know which one.

Virtual functions are basically backups for functions. So it tells the complier that if a function is overwritten then it knows that it originally meant.

pretty cool! ... well explained.

amazing

What is the difference between Player(const std::string& name):m_name(name) {} and Player(const std::string& name) { m_name = name; } Is it some kind of syntactic sugar?

Congrats, fellow hacker, i recognise you as one of them 'Non-pasters', have a nice journey hooking them VMT-s!

@The Cherno when you say some people don't prefer virtual functions, what's the other option in that case? Is it CRTP ? Do you have a video on what to use if no virtual function?

I can't say how useful your series has been. My son is twelve and is into robotics and programming and switching from python to C++. He loves your series and I'm playing catchup to help him though I'm the one lagging behind. Thank you, and let me know, if you read this, if you ever considered doing something about OpenCV or anything machine learning? :-D

I enjoyed the video :)

This is amazing, first time watching one of your videos and I'm in for more! Thanks!

Hey Cherno! Are these tutorials going to be by the C++ 14 and up standart? I mean like will these tutorials be of modern C++?

Thanks a lot for the video! :))

Employer in the interview: "Where did you study?" Me: "The Cherno University..." Employer in the interview: "Where is that located?" Me: "UKposts..."

A very basic question (coming from java). Why do you write Entity* e = new Entity()? Why do you add that pointer * ?

guys this is the hardest in c++ so dont quit

From the auto-generated English captions: "Hey what's up guys my name is HMO and welcome back to my syphilis gloss series!"

you just summarized my 3 hours lecture in 5 minutes

Hey Cherno, could you please make a video on the virtual table and stuff.

1:10 why is m_Name, class variable, used after : and with () like a function ? is : part of labda" notation ? and () funcional" casting/asigment ?

thanks

Not sure if this will get seen this many years later, but I have a quick question. Does this mean that we should always define all of the functions in the base class as “virtual” as a rule of thumb? Thank you for the videos yan love your content

Thanks for this awesome video ! Will you do a DirectX tutorial in the future ?

Slapping like on all the vids :-)

I have learned a lot from your videos. Can you create a tutorial on setting up C++ in Visual Studio Code? Visual Studio is still too heavy for me.

Like the speed... Good.

player(const std:string& name):m_name(name){} // this is an example of initializer list

I was wondering why you used the x->object style instead of x.object but it turns out that x.object won't use a vTable. Baby steps for me I guess.