Buckys C++ Programming Tutorials - 42 - Arrow Member Selection Operator

[@NoobOnTour024]

Bucky, you must have heard/read this a thousand times, but I'm gonna say it again. You are a hero. Seriously, I really appreciate what you do! I'm not done with my Bachelor degree yet, but if I ever make it, it will be thanks to you! My teacher is... Nothing close to a teacher. So we have to learn this stuff ourselves. Couldn't have done it without your tutorials.

[@waldomonroy452]

Did you ever finish your bachelors degree my friend?

[@alexdoodd]

I've read 250 pages of C++ textbooks and 42 tutorials in one day... I should probably sleep

[@Howtodothatshit]

***** Too much dedication, you body and brain needs to sleep to keep track of what you've learned throughout the day. If you stay up for too long, you won't remember much of it when you wake up.

[@lastofthestars6481]

holy cow bro hahhah :))))

[@ROVAKAN]

this dude wrote it 4 years ago , he must be a bilioner right now acording to his dedication :)

[@shahmeer911]

So how's it going now a days

[@nepalihercules]

instead of doing that, it's better to just do 4 of 5 tutorials and try to to use them in examples.

[@jared0801]

The way you said "A pointer isn't the same thing as an object" just made my day xD

[@AlphaCrucis]

I'll go to bed after one more tutorial! It's like I'm addicted to these!

[@waldomonroy452]

Same. Did you learn the concept well and are you still coding today??

[@AlphaCrucis]

@@waldomonroy452 I didn't really continue with C++ specifically until a few years later. I am still coding today for work and for fun, though I still don't feel anywhere near being an expert.

[@TheVideoVolcano]

Coming to 12 year old videos to learn because bucky is a phenomenal teacher.

[@glennjoecy]

Very clear as usual. Copy/Cut is the Edit menu (right click)

[@areg7182]

Bucky, Idk how the hell can u make ur videos so that i dont get bored. i watched 20 of them today!

[@CinghAnkit]

for guys having problem during compilation .here is the solution . open codeblocks --> create new project-->choose 'console application'-->write the name of your file-->then goto file -->choose 'class'-->uncheck the buttons as told by bucky-->click ok-->on the left side of the screen you can see your file name with codeblocks logo and two subfiles under it 'sources' and 'header'->to create the main you just need to click on the source and you will see there is a main.cpp file already created-->just open it-->you will see bunch of codes there,erase them and code! like this so that other people can refer to it as this comment is very lately written.

[@mohammadbadruzzaman1067]

People who are having problem with "undefined reference to " error, please uncheck "use relative path" check "add path to the project" check "header and implementation in the same folder" It solved my problem

[@Sevendogtags]

Thanks a lot man! I didn't uncheck Relative path and I was getting this error so I took a look at comments you solved it! :P

[@Sevendogtags]

btw, anyway to change the settings of an already created class or do I have to recreate it if I did something wrong like this time?

[@jaycobea7610]

thanks bro!

[@MrInfoJoe]

***** ty this solved my issue too, but could you explain why not having that box checked solved the issue. Thank you for your time

[@JoelDzs]

+Zaman Shakib DUDE YOU ARE A LIFE SAVER !

[@M_Hamza]

pretty cool..huh?!!

[@RadicDotkey]

This is the most important lesson. A quintessence of C++ Thanks for that.

[@MontSteve36]

Actually the is a Copy on that menu. Right click>Edit>Copy. I am really getting a lot out of these tutorials. Thanks a lot. And God bless you.

[@NecroPhase1]

I finally managed to fix this error by deselecting the "use relative path" option and setting the file path to the 'include' folder located within program_files/code_blocks/MinGW (or whichever compiler you're using). Create a project and add your .cpp file before creating a new class. Go to project/build_options/search_directories and add a new search directory leading to the same 'include' folder as before. Once this is all done a new class can be added. It should be automatically created in the 'include' folder where the compiler will now look and should find the header file. Hopefully this sorts the problem those who were confused about it.

[@Deathfang89]

csharp/java programmer here. @ 7:47 I still don't see the benefits of calling a function through a pointer... Why would it be better to do so exactly?

[@thesickbeat]

it'll do the same, but it the difference is is that the latter one is accessed with the dot operator and the first one with the ->. The reason why -> exists is to make it more visible whether it was used by a pointer or an object.

[@73igStar]

Thank you so much for these immensely helpful tutorials!!

[@waldomonroy452]

Are you still coding today?

[@TheHTMLCode]

If you created your class through the class wizard this should have been done automatically, but glad you resolved your problerm!:)

[@lutescutudor]

Awesome. Just subscribed and plan on learning new things on your channel. Thanks for the amazing work.

[@ildottore2]

codeblocks 13.12: People who are having problem with "undefined reference to " error uncheck "use relative path" uncheck "add path to the project" check "header and implementation in the same folder"

[@zeeshiscanning]

thank you bucky, i was getting tired of Arrow Member Selection Operator but you made it cristal clear.

[@nutellablop]

This tutorial is the answer to life, the universe, and everything.

[@vbukhari86]

hey Bucky, you have done great job with this tutorials....thank you very much from one of Gators.

[@waldomonroy452]

Are you still coding today?

[@SerhatAtes]

nice to mention here: (*sallyPointer).printCrap() is equal to sallyPointer->printCrap(). dereference stuff...

[@onelerv1]

@vbukhari86 printCrap was defined as a function specifically for the Sally Class.. So if you ever want to use the function you have to use the object accessor (which is either . or -> depending on rather its object is on the free store or not) But to answer your question he defined printCrap in the Sally class so he can only use it through an object of that class.

[@forcebewhithyou94]

If you include this in your .h file, Bucky you are able to used in any cpp who use this .h #include using namespace std; no need to declared in any other place. Your tutorial are really good, thanks.

[@theronster345]

Thanks Bucky So helpful. I enjoy your welcoming voice and humor. Excellent Character as well.

[@OnTopOfDreams]

really appreciate going over the whole process of class n object to refresh my mind. Great Vid

[@kareemtawfik2886]

U r the best bucky i wish you are my professor rather than my professors 😂

[@viandare]

I like your engaging way of teaching I will take action...........

[@rodrigueskorn]

MyFFfanatic, I don't how to pay you this, but know that you clarified my mind, you open it. Thank very much. I had created the files, but they were not indeed in the same project, they were just in the same folder, as you said that was not enough, then I could see, because you helped me.. Thank you one more time.

[@asfadasfa1234]

Also for anyone who doesnt know, if you wanted to create a pointer without the original object, you could do this. Sally * sallyPointer = new Sally; btw thats also how you do dynamic allocation. but if you do that at the end you want to put delete sallyPointer;

[@madhavsuri4396]

I like the mimicry part :) some people are waiting to make us make trivial mistakes and then jump on us (lol)

[@sergeantseven4240]

Did you have a couple beers before making this? lol Thanks for these, great for refreshing my memory.

[@theblobber4461]

If "undefined reference to"-error occurs, first of all try: -in main.cpp add also: #include "Sally.cpp" If this not works try: -uncheck "use relative path" -check "add path to the project" & "header and implementation in the same folder"

[@joshnichols9667]

these videos are fantastic, on a side note i hope you have improved your diet

[@pkflyers]

They usually are a precursor to using Linked Lists, as many use Linked Lists within classes

[@Ravushika01]

I had the same problem too, I solved it including the start of the "main" the instructions: # include "Sally.h" # include "Sally.cpp" and works fine

[@faisaltushar774]

Your comment helped me a ton after 7 years of making it. Thanks a lot.

[@MrBumpalicious]

Yeah, you can CTRL+V. Which is what buck does. he said "Code blocks dont have a Paste option" so i was just giving him a tip or what-not.

[@Telseilong]

@conorucd that a hot key to copy yes but those are common to most windows applications. I was more talking about the Right Click Menu . Code-block puts all the copy cut, paste under the sub-menu Edit.

[@lunatunny7594]

Arrow member tutorial begins at 4:22

[@xthlon]

@iamawesomelessness i believe the * tells the compiler that it is a pointer and not a variable, int *p would be a pointer int p would be a variable

[@XGazudin]

Jesus!! That's exactly the problem I was going to ask about here, thanks man you saved me some trouble. Still, there is one thing bugging me: In the last video about header files n stuff, I had the same problem. I "solved it" by actually creating a project within code::blocks and going through the video again, and it worked. And tbh, I think that's some stupid shit. Why would having the files in an actual project make such a difference? The code is identical after all

[@jrose6891]

Nice Deuce Bigelow reference, Bucky. :D

[@bohterham]

@Aireavix haha achievment unlocked: First bucky commenting + 20 Gamescore

[@irfanete]

I did everything same according to video he showed but when I go run it...shows error message "" Undefined reference to Sally:: Sally ()" But Why?? I did everyhting whatever he did in video..Could anyone explain please !!

[@parthgoel6151]

maybe its too late to answer but still. you should create a program in a project and not like directly making it from an empty file. I was facing the same error

[@klodiqoshku4315]

@@parthgoel6151 not that late.maybe you cant help him right now,but helped me.

[@this_is_mac]

@@parthgoel6151 You are freaking late man!!! I was searching everywhere for this problem for about 1 hour

[@this_is_mac]

@@parthgoel6151 Thanks btw :D

[@this_is_mac]

@@parthgoel6151 Thanks btw :D

[@jamesaylward2303]

To copy with clicking in codeblocks, right click and then go to the edit sub tab. It's there

[@unison1978]

that part before 2:30 was not explained very clearly, I had no idea what you was talking about... Could you please go over it for the layman?...

[@aperson4051]

Anyone know in which tutorial he explains why you would want to use the arrow member selection operator?

[@Ishihok]

@Mr1naruto You indeed speak truth. I am only started watching the vids because i knew bucky would give me a better explaination about pointers than this book i am reading. Once I am done here I am going straight back. He did a wonderful job with this stupid subject, hopefully i will learn why pointers are worth their time soon, although it is interesting passing address into parameters.

[@sagargdeshpande]

@Bucky @1.23 you say there is no copy ,goto (right click) to Edit there you have the option.

[@lauro199471]

did somebody say steak? lol

[@Johnybogo]

this is what makes his tutorials the best, the names he gives are just hysterical.

[@imackshungames4304]

Chie would be proud.

[@bredmond812]

"I love steak." -- Commander Shepherd

[@samirgunic]

1:17 Yes there is?! Just go to the Edit submenu, select Copy and be happy.

[@somasarkar2008]

lol

[@Nahiyan12]

@QuicK2800 Maybe, you were viewing the tutorials where Bucky was using Dev C++ and accidentally you click this video if I am not wrong.

[@VedantMishra55]

yeah

[@Jakobpb]

You are a gentleman and a scholar.

[@AbdelmajidZahmoul]

Somehow i had the error in the latest version of Code::Blocks, but when i switched to the 10.5 version that he uses here the code run perfectly guess they changed some check-Boxes or values in the class creation box

[@Qazqi]

Just what they are in math: a way to change the order of operations. Or do you mean the ones used to call the function?

[@MontSteve36]

I have had trouble getting either on of these external class programs to run. The problem lies in the #ifndef statement. replace those three lines with on line at the top #pragma once. This does the trick.

[@CCNezin1]

@eclecticatdesign I realized a while after that you have to create a project and add all of those files to it in order for this to work correctly.

[@MrBumpalicious]

Code blocks does have a paste option. Right click >> Edit >> Paste.

[@doublewhopperjunior91]

After years of trying to figure out error: 'class A' has no member named 'printA' I have come up with the solution. Create new project file -> create new class -> uncheck "use relative path" -> set the file location for the folder ( you have to double click where you folder is, I skipped this step and I was about to give up ) Make sure under projects tab to the left, under sources, your main.cpp and your class .cpp file is there

[@TheHTMLCode]

Ahh right! I was confused, thought you did not know the paste short cut hehe

[@popocraft4677]

6:47 why are the letters different on the rows?

[@TheHTMLCode]

Hey what IDE are you running? Im not sure what code blocks looks like but Im running visual studio 2010 - if you created your class properly via the wizard you should see under source files folder "main.cpp" and "class.cpp" under your header section you should also see "class.h", if you did not save these into the same location they will not be there, in which case you should seek them out in your directory and use #include"../../class.h" to include them into your program!

[@hajrafarooq2870]

youre surely a big Mc fan xD

[@MrSalehovich]

Probability researches concluded that if you get a sample of 50 people or more, your probability of finding two individuals with the same birthday date is almost 98%. So if you are in a party with more than 50 people you can bit on this and have yourself a hundred bucks ;). (By saying the same birthday, i mean the same day and the same month, but not the year of course).

[@rodrigueskorn]

Thank you for helping, but all the files are in the same folder since I have created them. All the headers files are correctly put, but the problem still happen. I changed the compiler MingW for Borland 5, just to see if the problem was on the compiler, but the problem is there. I can't figure out what it might be. After I having changed the compiler, the error is almost the same: "Error: Unresolved external 'Sally::printCrap()' referenced from 'D:\MYPROGRAMFOLDER\MAIN.OBJ'. Any idea? Thanx.

[@danielb3904]

I get an error that says No Such file or directory, anyone knows how to fix this?

[@zhahzain]

make sure you add paths to the project while creating new class

[@Skulltroxx]

why did he create and completely different page for the class? Couldn't he just have made one above the main function?

[@瑠ちゃん]

For some reason Code::blocks doesn't give me suggestions and I need to type everything myself?

[@lennartschellen3586]

The thing with creating that class and then use a function from there doesn't work on my computer although the settings of my class are the same as yours. Is this a problem caused by some new updates.

[@tachomnzvs3]

I'm stuck in 2:43 whenever I create my function (createCrap on the video, but i named mine different) the red error line appear under that function, it says "Error: Class 'Sally' has no member 'printCrap' " please help, I am using Visual C++ 2012.

[@iamawesomelessness]

can anyone explain me why we are initialising a pointer(say p) as int *p = &a; doesnt *p mean the value of the variable itself....... so if we want to point a pointer to the address of a...we should be doing int p=&a; thank you for the help...

[@ArtistofAkron]

The way the program works will not allow the use of a function unless it is introduced before hand. That's where the .h inclusion is for. Think of the .h as eharmony and the class .cpp is the actually person. they don't just go on a date without knowing who they are even meeting, they first go through a medium to introduce each other then go out for a steak. "Did someone say steak?"

[@shishirmaharaj6585]

hey.... How do you save when you are opening class..every-time i create class,it doesn't run and also when i try to save it and open again...i only get main.cpp and the other tabs are always missing... please help me..

[@gorsama-2190]

when to use it where is the video? awesome video btw thank you.

[@chaostroll1267]

6:07 Schooled.

[@rolarola5915]

just great. Thank you !!

[@evanmastermind]

What is the benefit of using a pointer?

[@taneix_tutoriales]

what is the diference from "(*pointer).print()" and "pointer->print()" or it is the same, but the result is opsoluted the same, but it is the same for computer ?

[@sherifal-demairy5279]

getting an error message .. " undefined reference to sally::printcrap any help ?

[@bernardparahbarje]

make sure all the classes are in the same directory as the main file or you can simply create a project and then create the classes. A project will give you the main.cpp by default.

[@unison1978]

Is it faster to point to a function rather than access it through the class?

[@Qazqi]

Make sure the one in your class definition is void faiths();

[@RaamAnkka]

Wait which video did he cover the class files? because i skipped whole lot of them because i thought i know pretty much it

[@brianlaudrupchannel]

I had to put using namespace in the other class for cout to work

[@northory2846]

+billyblackburn87 You could also use std::cout instead of cout and then you won't have to put using namespace in it.

[@amanuel2135]

+billyblackburn87 What +Northy Said is much reccomended: stackoverflow.com/questions/1452721/why-is-using-namespace-std-in-c-considered-bad-practice

[@buraky16]

+thenewboston god, bucky you teach very well but no offense , the way you sort the topics are like sphagetti . i came to this video from 55th tutorial and it also really took so much time to find that video cuz of naming (i was looking for 'using pointers in classes' ) . Thank you a lot for teaching anyway :)

[@spacemansensei9434]

If you get an error.... restart codeblocks it works :)

[@Tonyrosama]

I also constantly try using right click- copy on CodeBlocks. Maybe its for the better to break the habit for good!

[@waleedaz100]

Dear my brother, please can you show us how we can open a new class with visual Studio 2019 as you have done in your video. I am stuck. Please, i need your help

[@shirshahsahel917]

I am facing an error that says ||=== Build: Debug in pact 2 (compiler: GNU GCC Compiler) === error: 'Sally.h' file not found| ||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===| Any idea ??

[@oscarabrahamsson5820]

I love this Arrow Member Selection Operator :D

[@akashpriyadarshi5612]

I am not able to wrap my head around the concept of class and objects as to why we actually need them.Could anyone please help me out here?

[@steve122288]

Interesting how you can declare a class within a function, and still use it if all your functions inside it are already defined. Course, when you try to define them outside the class, you get errors; c++ seems to think you're trying to call a function in a different scope or something. Strange thing I noticed.., If you create a class that uses a header file, then delete the header file and all references to it, then go and try to define class functions outside the class declaration, it gives you these "multiple definition" errors. It behaves similarly to if you were to try to define its functions when already inside a function, but seems to think perhaps that the file is for defining things only, and so when you declare something, you are also defining it.

[@Bengadeer]

Code::Block 13.12 won't let me use the Sally object without defining the Constructor first. I get "undefined reference to 'etc.' " dot reference or -> reference.

[@ranesagar]

+John Wolf 1. Save all your files (all the 3 files) 2. Close CodeBlocks 3. Restart the CodeBlocks application. That will solve the problem

[@Bengadeer]

+Sagar Rane Thanks. I found out I have to open a new project for each of these exercises. Code::Block doesn't know where all the connected files are without them being in a project. So now I start with a project and the only issue is occasionally CodeBlock can't find some reference MS file I never heard of, but restarting the app makes all that go away and it works perfectly fine. I'm using WinXP. That might have something to do with it!

[@ranesagar]

+John Wolf when you create a new class file, just un-check "add relative path" which is by default checked. By doing that, you would not need to restart code block.

[@Bengadeer]

+Sagar Rane Okay, I'll look into those dialog boxes a little deeper. There are a lot of boxes to check or uncheck. I did notice when I closed out a troubled exercise, CodeBlock had a series of dialog boxes that essentially got everything straight as I closed out. I also figured out I didn't need all the extra .o files, etc., just doing these exercises. The given main.cpp file that comes up as part of a project is interesting. It has acted weird some of the time. At first I had to "save-as' to a different file name to get the .ccp file added to the project and then delete the main.cpp and other times the main.cpp didn't give me an trouble at all. I just filled it out and went about business. I got the weird MS file the app couldn't be locate as a error message when main.cpp was acting weird. It wouldn't build and run because of this error. That's probably part and parcel to setting by the dialog boxes as well. By just building up a project with each exercise, all runs smoothly.

[@AnupKumar-wk8ed]

+John Wolf Thanks a lot. Your comment helped me with same problem.

[@jbkfootballer]

when did you switch over to codeblocks from dev c++

[@katieyeates6856]

I know this is probably a stupid question, but in the header file when prototyping the function printCrap why do you need the void before it?

[@leonardotornesello930]

if i understood well, you need the -> in order to use functions into classes and not the entire class, am i right?

[@itsforyou7244]

I can't understand the benefit of using pointers over actual objects. Will anyone help me? Bucky didn't say it either

[@kuanlimputera]

This may be silly but how to type the symbol arrows member selection operator in your keyboard .. ?

[@Moon_Rose달장미]

at 6:07 Bucky be like ( *in weird voice*): Some people are gonna say, Grammatically, pointers aren't even the same thing as an object

[@Qazqi]

It's not enough for them to be in the same folder. They have to be in the same project in your IDE.