Dynamic Arrays in C++ (std::vector)

[@davidcarwile9205]

Seriously, you are better than my instructors at explaining everything. You are better at explaining than the damn books. These trimmed down and non bloated explanations are so much better than what I have been going through.

[@BombeNissen]

Great set of videos! I study computer engineering, and work with C++ for nearly all assignments. When there's issues with the code, I've been using these videos to get a deeper understanding on how a certain topic works, and it's been a huge help. Keep it up!

[@matthewortiz7859]

I learned more watching this than a week taking my CSII course! Keep it up

[@woofelator]

Same

[@ytacctaccnt]

Go boy, go! You're my inspiration for learning C++. Your videos and your charisma and attitude!

[@sizlax]

I double this. He's not like most of the other people that teach this stuff on youtube. Listening to most people is like listening to text to speech or Ben stein and watching pain dry at the same time. This guy will make my life if he avoids using the word GOOEY and says G U I like a normal human being.

[@sizlax]

@@MrSerozka Sure, they make up something that sounds retarded and takes more to spell than the original spelling for... reasons! Fuckin millennials..

[@mrbrian826]

I wonder after 4 years if you ever did learn c++.

[@ytacctaccnt]

@@mrbrian826 Yes, but I still don't use it as my primary language, practically for anything... I'm into C# at the moment

[@mrbrian826]

@@ytacctaccnt nice

Fantastic channel! So great to get things explained by someone who actually knows what goes on behind the scenes, and who does not make absolutely everything into an programming analogy with food and animals. 10/10

[@JoeyMcCart]

Man i'm so glad I found your channel, you're saving me rn

[@bratanvonehre3559]

Brilliant channel man! Right now I have to implement an algorithm in an efficient way in C++ for my studies, your videos are an incredible help!

[@abdulcool1268]

your videos are truly amazing. I wasn't able to catch up at first but now i really enjoy it and i am getting to understand more and more about c++ everyday

[@flippygat3]

Amazing channel, just found it. :) Also the first tutorial channel I have ever found that I do not listen to at 1.5X speed.

[@ldmdesign5610]

i need to slow it down sometimes i think lol

[@nighma]

It will be so cool to compare one of the STL container (as an example) with one rewritten in the EA library and see the differences ;)

[@arhantbararia380]

it will be 35$ extra for that DLC

[@Blonder_Studio]

better not to, BF2042 is one reason for that, game so broken that Engine so broken as well and plus extra charge for DLC, so good that Cherno left EA

[@lightknight876]

@@Blonder_Studio he's too good, passionate and professional for them.

[@ashleycalhoun1824]

Probably my favorite programming channel, Not only are his videos exciting, his style is so much cleaner. Best channel on youtube!

[@jannesopanen8032]

Yea he tends to dig a bit deeper than others :)

[@ashleycalhoun1824]

@@jannesopanen8032 here you are replying to a comment from a couple years ago, and I've already forgotten all I knew about programming.

[@fayzankowshik3625]

I love how you treat C++ like an actual language you'd speak in

[@ryhi-gg1]

He explains it in such a clear way!

[@yl2415]

Up to this point it's not that I don't know all these, it's just I want to see how you program, because you have way better programming style than I did. Thanks Cherno!

[@agentandy159]

11:30 Thanks for addressing this finally... Coming from C# I saw the method signatures in C++ and thought "are humans supposed to be able to read this"

[@keidon6841]

So much usefull information,u do not just give general understanding of a topic but provide the logic of its work i am glad i found your channel

[@sanjayreddy3295]

It's called a vector because Alex Stepanov, the designer of the Standard Template Library, was looking for a name to distinguish it from built-in arrays. He admits now that he made a mistake, because mathematics already uses the term 'vector' for a fixed-length sequence of numbers. C++11 compounds this mistake by introducing a class 'array' that behaves similarly to a mathematical vector. Alex's lesson: be very careful every time you name something.

[@christianlabanca5377]

So now we have a class named Vector that behaves kinda like an array and a class named array that behaves kinda like a vector... Indeed, be careful when naming something

[@clodgozon3968]

11:34 Roughly speaking, abstract thinking develops over the years as a programmer which is a good trait so one doesn't have to stay longer into details like this.

[@tanguyletessier]

Thank you! One of the best YT channels to explain simply difficult (at first glance) problems and especially put them into practice

[@maryameskandari7510]

I learned a lot , thanks pls keep it up and make some video about graph representation and boost library

[@perelium-x]

Thank you SO SO SO MUCH BROOO! You don't know how you've just helped me... I understood every single thing you just said.😱👍👍👍

[@ahmedanwar976]

at 9:48 if anyone doesn't understand how he initialized the struct you can search for "aggregate initialization".

[@Xgamesvidoes]

Yepp... I was also confused with going from Unity C# vectors... To the C++ version of vectors! XD Nice video!

[@manishgurawalia7625]

11:40 C++ is love♥️

[@MultiVishnu55]

bro, you're too smart! goddamn, good shit

[@abhisheksa6635]

Will be glad to see someone trying to rewrite a STL written thing which can be more optimal and more towards the personal use case.

[@rcookie5128]

Great stuff! The name confused me too when I first learned about std::vector..

[@limmeh7881]

To think I was modestly learning about pointers and jumped into this rabbit hole.

[@serkanozturk4217]

Personal Notes: -dynamic size, at the background it has limited memory but when reaches the limit, it creates a bigger sized memory and copies contents to it. - #include - std::vector vertices To add: entities.push_back((1,0,0)) (must be implicit conversion) - can use it in for loop: for(Vertex v: vertices) { //do sth } To prevent copying and being faster, for(Vertex& v: vertices) { //do sth } - to delete 2nd element: vertices.erase(vertices.begin()+1)

[@work9167]

This is amazing, man. I like your videos so much

[@Solo6R]

You're a god with a compiler. Been programming in C++ for longer than I care to admit, and when I stumble across something I'm not 100% confident with I think "I wonder if Cherno can help me out here" and sure enough you can, and have, several times! Keep up the good work bud, VERY much appreciated.

[@MichaelYoussry]

Thanks for putting so much effort into these videos.

[@archimedeis]

Wow that was pretty well done. I think I got enough to try out my own sort of mini project.

[@tannerbarcelos6880]

Yet to understand why my professor decided to teach so much array stuff but said “vectors are the same so I’m gonna skip over them” when in reality, these vectors are beautiful works of art that shit on arrays lol. Simply the fact that they’re dynamic makes life so easy.

[@vaddimurthyram3364]

Thanks a lot......clearly explained basics about vector(Dynamic Array or Array List)👏👏👏

[@genelee2050]

it happened again. Near the end of the video, I thought someone else was playing music somewhere until i realized the source coming from this video...

[@diassagatov9784]

Enough eye contact for today

[@orbyfied]

so i didnt know how the vector class worked, so i created an "ArrayList" class, and i did the exact same thing that the vector class does xD to add an element just create a new array with current size + 1 and copy all of the previous contents into array[0 to size-1] and put the new element into array[size]

[@orbyfied]

@Peterolen i know but it is sort of a simplified version of the vector and ArrayList. It has the same concept behind it

[@shadyganem5448]

Great video. I learn so much from this guy. real talent. I would like to learn more about the best practices of memory allocation.

[@CombatFXZone]

I absolutely love the comparison with Java, because I started out with Java in High School.

[@Blonder_Studio]

learning programmin in high school sucks balls i learned c# in high school and my "teacher" is a piece of shit bad

[@nhensonbass]

I know this is about five years later, but another reason I've learned not to store pointers in vectors is that the element can be deleted from the vector leaving a memory leak. If you're using vectors with pointers, be careful.

[@zaid4708]

"Simple spice series" very accurate caption

[@erwinschrodinger2320]

Great video as always!

[@jms547]

At 8:50 there's a note about moving rather than copying. Is there a video about this in this series?

[@hassantariq4731]

Thank You For Saving My Semester :)

[@younismalik8809]

Thanks The Cherno! Great explanation as always! 👍

[@TheTrashpack234]

Is it bad that instead of watching the video I'm just watching his hands?

[@1Naif]

No

[@PflanzenChirurg]

explains pretty much everything

[@mprecup]

If I'm watching his hands, it's because he's getting close to backhanding the cactus.

[@MsJavaWolf]

That is the purpose of the video. The hand gestures are an advanced form of hypnosis that will make you understand vectors better.

[@Dunestorm333]

I think The Cherno is secretly Italian ;)

[@PongPongDudlDu]

Hey Cherno! I got a little question about passing the vector to a subfunction: In the Video at about 12:50 you are passing the vector via Function(vertices); I would have expected a Function(vertices&); to specify it as a pointer or a reference, basically. In C, every array is automatically passed by reference, it will never be copied. Is it in C++ depending on the parameters of the target function as it is a pointer in your example? Would love to hear your answer as I am a C developer and sometimes C++ is still a little strange to me. All the best!

[@GenericPhantom1]

Dynamic arrays (mostly std::vector) is an array which can resize. You can push new things into it.

[@hangyanma2501]

你好，陈诺，你的课讲的太好了

[@李景天]

I remember in Bjarne Stroustrup's book, he never talks about raw array, he just went a head and talks about std::vector.

[@sharrayyy]

Coding and guitar That's an awesome combo!

[@lizzienovigot]

In linear algebra pne of the basic example of vectors is exactly what programmer would think of as an array or a tuple. So mathematically its quite natural to identify arrays and vectors as being very similar, if not the same thing

[@cowboybebop521]

very nice little class learned so much cheers!

[@stevefox7418]

Very nicely explained and very informative!

[@paul87173]

hey cherno, why dont you use "using namespace std" when you code?

[@carlomiriani5588]

can someone explain me this function? i understand that it takes the vector as parameter, but why "std::ostream& "? It returns stream?? why is it that? i know is operator overloading stuff, but he's not really beginner friendly with this kind of stuff.... std::ostream& operator

[@alexdavidsantiago3955]

All the videos have in common that when you made a question and the answer is: "It depends"

[@blackfun4448]

you are amazing at teaching, keep it up!

please make parallel process and simd tutorial

[@dmitrijjafisov1912]

Quality content! Thumbs up!

[@abhayagarwal7103]

Man, your concepts are so clear.

[@kemptcode]

You should mention emplace_back in another video.

[@joriskbos1115]

I was writing a little game in c as a bit of a challenge and I had to write my own dynamic array. The way I did it was that you create it with an initial size, but when it exceeds the size, the size of the array doubles. That way I don't have to reallocate the array every single time I add or remove an element, but I'm also not using up too much memory.

[@sethtaylor7519]

I'm pretty sure that is what vectors do as well.

[@amaanmohammed6131]

what happens if there are no vertex does not have parameters would it just be vertices.empalce_back() ?

[@manuellabor2759]

Subscribed! Looking forward to going over your videos on C++👍👍👍👍👍

[@chemistrymickey]

Hm... While following along after making the Vertex class and attempting to print it to the console using std::cout

[@Byynx]

Should we call STL to the C++ standard library ?

[@sidharthcs2110]

In physics we can represent a vector as a row or column matrix( kinda like a 1d array ). maybe that's why

[@Moren162]

Please go in to data structures! All other videos is not even close your your quality!

[@georgecristianiordan3712]

Well i would like to see a video with data structures too, youtube lack of quality videos with data structures in c++.....

[@ags0004]

Data structures are supposed to be abstract and language agnostic, unless they need to meet a very specific need. But assuming you are talking about datastructures such as Queues, HashMaps and all that, the implementation is relatively the same. The only thing that might be a little different may be some fine tuning using your knowledge of the language to optimize some bits. But they should work the same way they would in every other language. Knowing how one is implemented in abstract and knowing the language you are going to implement them on is the only thing you need.

[@dan110024]

As a front-end JS dev, 3 days ago I had not a care in the world for performance. Half way through this C++ playlist and my first thought on hearing how this works is 'Damn that must be expensive.' JS seems so basic now lol.

[@lowieh.3451]

I tried casting an int to (std::vector::const_iterator) to use as argument for the erase function, to no avail. Anyone understand what happens when vertices.begin + 1 is used as an argument? It seems there is some conversion going on, right? Why can the '1' be used there without any problem?

[@ncky2431]

Am I the only one that thinks the push_back({ 1, 2, 3}) looks weird. He said that this is done with the member initializer list however to me looks more like implicit conversion. Can anyone explain?

[@stewartzayat7526]

I have a question not related to the topic, why are classes in the standard library defined with lowercase identifiers, even though everyone declares classes with camel casing?

[@jayasribhattacharya2048]

In java compiler is your teacher but in c++ the compiler is your friend.

[@JohnnyRelentless]

I thought that arrays were pointers, so that you are never really passing the array to the function, but only the pointer, so you wouldn't need to pass by reference. Is it different for dynamic arrays, or am I misunderstanding something?

[@sewingsugar9892]

Can you recommend a book or course that gets more in depth information about behind the scenes of c++?

[@Hoptronics]

Ugh.. I've been passing just pointers around. Like: void setName(const char* txt){ _name = memcpy(txt,strlen(txt)+1); } Is this bad??

[@alexwhite6133]

Why the std team dont rename it to List ????????? simply as that?

This will result in failing builds for all the codebases which are using std::vector. It's not that easy to change the api which is standardized.

[@meJevin]

too many pages of documents would have to be rewritten, too much work in general would have to be done in order to make some class name more 'intuitive'. list is not a good name, btw. that's another data structure that operates differently, and already exists in c++. he'll probably talk about them.

[@Hopsonn]

Alex White not to mention list is already part of the std (linked list)

[@krood_]

Whats the difference between dynamic array and vector ? are they both the same thing ?

[@drxddy]

If i have a pointer to a vector which then moves to a different memory address to due to resize does my pointer automatically point to the new memory address?

[@ycp101]

Yes, you are great! your ccoding skill are great! I envy you!

[@Anonymous-mz9un]

i am a beginner. But why you are not using namespace std; along with headers? Thanks in advance.

[@miguelbarroso_]

It's a bad practice.

[@Anonymous-mz9un]

@@miguelbarroso_ Will you elaborate please?Sorry if it sounds naive. I believe that makes your whole code type faster. Thanks in advance.

[@Anonymous-mz9un]

@@miguelbarroso_ Ok ignore my comment. importing whole name space is memory wastage got it. But what about using it like this typedef std:cout cout; typedef std:cin cin;

[@miguelbarroso_]

@@Anonymous-mz9un The Cherno made a video about it. Just search for: "Why I don't use using namespace - The Cherno"

[@Anonymous-mz9un]

@@miguelbarroso_ Thank you :)

[@kensparkgg]

*making video as soon as you wake up*

[@otangerineo]

i love you papi cherno

[@jonathanolivier6932]

Good video, but if you have a vector of string, what can you do if you want the first character of a string?

[@sirrcharles1869]

The code on the screen does not compile. Use: | std::cout

[@tahaalkhashmany5678]

does it basically work like dynamic memory allocation with malloc/realloc in c?

[@Stav_Bodik]

A vector is a list of something (numbers for example) (can be in a row or column), A matrix is an array of vectors (one or more rows, one or more columns). More specifiec in Math, A vector is an object that has both a magnitude and a direction represented by numbers...and if you think about it, it is a line in some direction in some dimension that has a list of numbers and has start/end (size/magnitude). So you are little bit wrong, vector is a very good name (: Maybe hard to understand like ArrayList but Yes it makes sense.

[@ibrozdemir]

12:32 why do i have to indicate reference when i am passing actual classes in methods? void Function(const std::vector& vertices) isnt vector a class? its not a struct or a simple type, it shouldnt be get coppied just because i put them as parameter

[@ibrozdemir]

@Peterolen so if dont put & this there, compiler will only copy the pointer address right? not the actual class.. so i only prevent copying content of the method parameter variable right?

[@ibrozdemir]

@Peterolen this is realy feels different then other languages i coded.. copying whole object.. objects treated differently then int or float or struct in other languages.. it will be hard to get used to this.. thanks for the help man

[@GoofyTHPS]

When you erase Vertex from your vector, shouldn't you also delete the Vertex instance?

[@lukasmodry196]

Is there any reason why you not use ""using namespace std;" ?? Or you are just use to type std infront of code?

[@jimhalpert9803]

He has a video on this topic

[@saikirangattu2924]

Very nice , Please make more videos on other data structures

[@rafikmoh9295]

hello, I have a code which is working for the existing hardware setup but now I want to extend this code for mutiple hardware at a time. for this type of project. can anyone guide me on this this.

[@michaelwright8576]

Why aren't the array elements printed in a single line?

[@shahzaman2089]

kindly can someone tell me where is the AISTL link

[@lKyoto]

Video on advanced vector class: not found. :C

[@marcol6268]

I probably understood everyhing in that video (or not) but I still keep failing at solving a rather "simple" problem, that I could not figure out how to do, even with this great explanation. Here is my problem: I wanna write a short programm that allows the user to define how many numbers he can type in ("store" w/e). So something like std::cin (n). So if he types 5, then with some couts he gets told to write the 1st number, 2nd, and so on. So e.g. 1,2,3,4,5 and after he did that they just get displayed. That is all to it. How do you do this? I have a solution but this solution only works with compilers that allow "int array [numbers]" ( so a "not constant" within an array). This probably will never be read anyway but if yes, help is greatly appreciated.

[@fwfwe48y4t]

How can I make a vector of strings?

[@samdavepollard]

i'm a noob but FWIW: #include #include #include int main() { std::vectormyStrings; myStrings.push_back(std::string("This would")); myStrings.push_back(std::string("be one way")); myStrings.push_back(std::string("of doing it")); for(std::string& s: myStrings){ std::cout

[@theamjolnir9641]

how do you access vectors of vectors? like in an matrix cause you can't exactly do matrix.assign() to a specific value can you?

[@huthayfa1723]

Nice video ; I'm really confused of these vectors in computer science if we needed a dynamic array we would use a linked list . what is the difference between these two ?