Copying and Copy Constructors in C++ 

finally a series on youtube I don't have to put on 2x speed lol

We're so lucky this C++ series are free x)

The speed you go is perfect, most tutorials are too slow. I lose interest and get nothing. This isn't overly fast and can be followed, also you can tell you really know your stuff so if just flows. Good work, thanks.

7:25 thank you for the solution for fixing random garbage at the end of a dynamic char array. I came here looking for copper But found gold

17:48 Little did he know it would take him 3 More Years...

As someone who learned C and Java at Uni, and is trying to learn C++, this was something that I didn't realize was important until recently. I think this helped solidify a few things in my head. I assume you're going to talk about Move constructors soon too.

Thank you so much. I've heard of this copy constructor topic many times and never understood it. You're the first person to explain WHY it's useful and the problem it solves.

Even though I've already been through most of this stuff, I love watching your videos 'cause they're such a great way to remind me of some details I've forgotten, provide another viewpoint on some of these topics and deepen/solidify my understanding of them. If it weren't for these videos I'd probably have a whole lot of "backtracking" to do at certain points but just watching one of your videos every day or two really helps rearrange all this stuff in my head in some kind of orderly manner ^^ Keep up the good work man, this series is basically the best online resource ever to do that sort of thing

Ever since I stumbled across your channel , it has become a routine to watch one or more of your videos . I don't know it's like an addiction . You have such a clarity in your understanding at such an early age . Awesome and good luck.

I've been rewatching this series just for fun, and as always the videos are excellent, informative, and concise. Thanks!

the best video for deep and shallow copy you really got concept clarity in each video really appreciate your work for society! love your work and explaining

Thank you. I knew vaguely about copying, but thanks to you I understand it clearly now. I'm also watching other videos from the C ++ series.

I recently found these C++ videos on YT. They're excellent. Thanks for the effort Cherno.

this cleared concept of shallow vs deep copy, copy constructor, along with operator overloading & importance of pass by reference, brilliant!

The most perfect and not unliked video series on youtube. U rule my Career propably, at least you have a signifant influence about my clarity. I have to thank u

This is one of the greatest content I have seen on C++ copy constructors...Thanks Cherno

How can I be so information-attended and creative in writing code and remembering it without facing any obstacles? I mean u're so fast, so good, keep going brother.

This was a really comprehensive tutorial. Thank you!!

I am new to C++ and your tutorial just save my life, thanks a lot!

Great job with this series!!

Excellent example, really clear and concise, well done.

Thanks for making a good example. It cleared Copy constructor, Deep/Shallow copy and reference.

Personal Notes: -Shallow copy becomes a problem for heap-created objects, not for stack allocated objects(might needs check) -Deep copy is performed by adding copy constructor. After writing copy constructor, you can use “entity1 = entity2” for deep copying -Explained pass by value vs pass by reference. It is safe to use const reference for the function not to be able to modify the object.

this is the most interesting episode in the series :)

Charno - No char for you

This literally gave me the solution to an issue I was having related to dynamically creating pointers inside of a base class. I narrowed down the issue that the same location in memory was being deleted twice, but I didn't know the next step. Then this video got reccomend almost as if youtube just knew lol. I'll have to implement the copy constructor and try it out.

Just want to say thanks for preparing me for my job interview.

ive said this before, and ill say it again.. this is one of the most informative code channels on youtube.

Man, this series is good. Fast, to the point and makes me feel like I've just sniffed 20 grams of speed.

Great summary, excellent, simple examples

There is no need to separately copy the NULL terminator in the constructor, you could've just used the m_Size + 1 in the memcpy, just like in the copy constructor, since if the string wasn't properly terminated, the strlen wouldn't work properly as well.

Congrats on 500K subs man !

Nice explanation, awesome . Excellent work.

you said at 1:24 "so what I'm trying to tell you is always pass your objects by const reference" and I misunderstood that, trying to pass pointers to arrays by reference... it was a 1-hour nightmare fixing the resulting bugs

Thank you so much for helping with that piece of code for 14:32

Such a fantastic lesson! Second time to review this.

TheCherno has taught me well; I saw the copies coming with the PrintString() function as he always passes by const ref to avoid this exact thing

Creation of "Reference(&)" is one of the good improvement of C++ comparing with C. Reference gives more "memory efficiency" to us.

thanks alot man, you are the best. for me this is heavy stuff alr, but you make me so easy to understand.

Thank you so much Yan for these amazing videos. I don't have the money to support you on Patreon but one day I will definitely do it. Love from India :)

Thank You. This was an awesome video on c++ concepts.

Thank you. That was super helpful!

Great explanation. Thank you!

C++ is a great language. I admire sir. Bijarn Stroustrup as well as sir. Dennis Ritchie.

Ah, looks like I have reached my first soft cap. Everything up to here was pretty easy to understand for me but I'm starting to feel that I have not understood the preceding topics well enough to follow this 100%. I get the problem you are trying to demonstrate but the stuff around it is a bit too shaky still. I will have to rewatch some of the previous videos and practice some more and I'm sure I'll understand this better because your explanation is done very well :)

Great video!

hey youre really good at explaining things cheers!

You sir are a very good, thanks for these series!

Amazing explanation ❤️

Fantastic content!!!!

Awesome Video .. All concepts well explained...!

Thank you Charno, I have learned a lot from you : )

Thank you, very well explained.

haha ChArno! Bro you are hilarious! Really like the series!!

That is awesome video!

For some reason, at my old place of work work our style guide was against passing by reference but to use pointers instead. I'm not sure if they determined it was actually faster, or because they preferred more "C" style code. I don't think the advice was much heeded, though.

The action is starting!

probably the best cpp video it covers so many things haha

Very helpful. Also note that you will make a copy when you return a String object

You talk really fast and put so much information in just 5 seconds. For a beginner I find Your channel intimidating to watch as i really just understand the first minute and everything comes after slips away

I love the humor this man has.

Thanks for this video! It is amazing. Greetings from Germany!

this video is still helpful in 2022. Thanks a bunch

The only exception that I can think of at the moment to the pass by const ref advice is with primitive types that can be created on the stack.(x86 specific) And that is because the speed of creating, using, and deleting stack frames is pretty close to the minimum lag physically possible due to a combination of cache coherence, registers, and the way the stack pointer works. In some cases the optimizer will not even assign a memory location to a stack primitive, it may live entirely within a cpu register; and deleting a frame is only a matter of decrementing the stackpointer which is generally a one CPU-cycle operation. Still its a pretty narrow case where a program would spend a substantial amount of time creating and deleting primitives. Along with the usual advice to not optimize too much until after getting the logic correct and profiling to find that big O chunk of code. (A bit of consideration for runtime efficiency is warranted during the initial draft just to avoid huge structural changes later on, just don't spend a bunch of time on it.)

youre a great teacher, thanks

really helpfull stuff :)

Nice one :) i get the ideas of what that actualy does far better Then in highscool explanation

Awesome, Thanks!

Hey Yan, I'm following your channel for about a few days, and I'm loving your videos about C++ and I wanna know if you have a Github of projects in C++ or maybe you know of some Githubs with projects in C++, I wanna look at the code to learn more programming technics.

Any idea when you'll be able to get to move semantics? BTW great job with this c++ series!

best video explaining copy and deepcopy

this is very good information

I just tried this technique and it work for object on the heap too.. so now I realized const reference is used when the object we want to use does not need to be changed.. although it is const it's value can be assigned to another variable like std:: vector or array

Great episode.

Very nice tutorial

¡Happy day, Cherno!

Deep Object.. Shallow Copy.. I saw that look! So many great analogies to make lol

Awesome video

Nice explanation.

detail is rich, pace is balanced, a sub is gained

Just WoW Thank you

Great video

Fantastic!

just excellent!

Aren't you already assuming the string is 0 terminated when you measure its length using strlen?

This was a quality lesson

I love you Charno

That cactus, watch out for your hands ;) thanks for explaining!

This is a lifesaver

So well explained Cherno. I would love to get a book with all those details of about C++, would you recommed me one, please?

Your tutorials are amazingly well done, and helped me a lot, thanks man!

You have my sub.

@The Cherno. Pls, pls, pls make a Cherno branded T-shirt. I wanna but its to support you cuz I love what you do and I want others to know about you. the best way for me to spread the good word about your channel is with a T-shirt!

At 8:01, since you were using strlen which calculates using null terminator, there will be a null terminator for that string, so it is safe to just copy it.

My own 2 cents: the size of a reference/pointer is around 8 bytes, if your passing bools, ints, floats etc etc, it would be better to copy them since they take up less bytes of memory.

Your hair is a riot in this one. :) lol

To those who don't know what the keyword "friend" does: Friend is a keyword that allows functions declared outside of the class to modify private variables inside a class.

You are talking so fast. but your style is very clear. Thanks for sharing.

Awesome BUT so fasssst! I have to watch the video many times to better understand. Anyways you are still my professor

Really good tutorial man thanks, I've learned a lot from you so far! However we disagree in one point, I tried this code and I found that passing by reference is enough to avoid the unnecessary copy constructor. It didn't need to use const reference. Has anyone else found this?