Buckys C++ Programming Tutorials - 57 - Abstract Classes and Pure virtual Functions

[@andrewyounan9157]

Bucky youre a legend

[@vu5700]

Its been 6 years since you wrote this comment,did you become a professional programmer?

[@gutoguto0873]

no

[@danyfour7754]

@@vu5700 I hope so

[@ISLAMguidanceful]

the difference between Buckys and most professor in elite universities is, he actually wants to help you. his trademark isn't knowing c++ as much as it is his sincerity, hats off to you sir.

[@neoslink1]

Your videos are literally the best. My CS2 teacher is garbage, and after every lecture I run back to my room to look up one of your videos on the subject. You're the only reason I'm passing this class rn XD

[@pranjalshukla8096]

+Ben Cicotte same here you've been great help. keep this up man

[@SirRobbStarkGamin]

what my prof wasn't able to teach me in 1.5 hours you taught me in 7:40 mins. You sir are a BAMF.

[@AdityaFingerstyle]

You just paid more attention to this video.

[@ArslanAli-cs1be]

he made us pay attention

[@AV1461]

Typical :D. I'd say that is why it is important to study on your own. Same thing could happen the other way around: If you watch this video first and didn't understand, then you could have your teacher teach it and you would understand then. Having two very different contexts teach you something is very effective at highlighting what's important. So, go to classes, read books, watch videos, etc..

[@TheAvekat]

Greetings from AU Software Bachelors, in Denmark. Would just like to thank you Bucky. Our teacher is linking to your videos if we prefer videos over books, which most of us do. So you're basically a university teacher :D

[@hashmatullahhassani2825]

Hi Bucky, I am watching your videos more than 3 years, I found no body at explaining logic points better than you. whish you more successes, keep shining well.

[@AdityaTiwari-le9oe]

Listening to your videos in 1.5 is a fun and fast way to learn. Thanks for your tutorials.

[@malaki7123]

Hey Bucky. I' started watching your tutorials about 2 weeks ago to help learn a new programming language along with my Java, and I've gotta say that I've learned a heck of a whole lot of stuff here that I've been able to use to understand all that other stuff, and I absolutely love C++ now. Thanks a lot!

[@CraftySidd]

So, just wondering. Where are you in life right now?

[@jordanmakesmaps]

I love it when I don't understand some aspect of syntax for c++, and when I search for it on KZbin, I see thenewboston as the first video. It's gonna be a good day.

[@muffinspuffinsEE]

Your voice is perfect in 1.25 for people in a hurry :) :D

[@kylethorburn5038]

+muffinspuffinsEE lol, i always listen in 1.25 : p

[@ChucksNourish]

+Kyle Thorburn Im almost tempted to do 1.5 lol

[@yoteango]

+ChucksNourish Every day 2.0

[@ke9n]

I listen in 1.5

[@danieldinh9911]

yoteango 2.0 for the procrastinators

[@bern1223]

For years I have never understood the point of pure virtual functions, but I was able to understand the significance of it because of you in under 8 minutes. Thanks Bucky!

[@giancarloandrebravoabanto7091]

Im in love with C++ even more. old is gold my friends

[@nc8024]

I really appreciate your channel. I spent hours reading stack overflow, professors lecture slides, and google trying to understand polymorphism and pure virtual functions. You explained it in a few minutes.

[@AssassinGrudge]

somthing importan bucky : you cant create an object with a Abstract classes : i mean if u did this Enemy Object; it will not work we can just create pointers

[@Muzzletainment]

I didn't understand at the beginning but after you explained it multiple ways and repeated some info it clicked! Thank you!!

[@mddilshadislam6617]

Hey Bucky.. Your vedios are inspiring and a gate away to escape all of the issues of broken mind....... It's been quite a days I didn't code.... Coz I have been suffering some meaningless emotional issues...After all, these emotional issues are always seemed to be meaningless as usual.... So today I'm got my track back on starting abstract class.... Trying to forget all those things....

[@Wiwiha123]

now it's 6:00 am and i have my first programming exam at 8:00am in virtual function and poklmorphism and the pure functions ... , thank u 4 this fast tutorial,really good one :))

[@dosomething3]

wow. you made the simplest concept - into something that even I cannot understand. Hats off.

[@preetigodara544]

you r seriously a legend, i tried to understand it from so many sources but i couldn't nd now after watching this video it seems so damn interesting and easy

[@tlhomotsemoteme2423]

I can't stop laughing and giggling because you make my programming life so easy! Thank you so much.

[@AndrewAmesbury]

Legend, queried 4 books 2 tutors and a friend but this finally made sense thanks to your short video.

[@thethinker8717]

Bucky whoever you are god bless you I only trust you on KZbin video for c++ ......you explain well dude

[@mehrnazzhian1912]

Amazing.Simple and understandable. Thank you

[@abdannour26]

I don't think that i'll be able to learn anything without Bucky Roberts, :) :) :)

[@MrKrillovski]

Thx for your videos. I didn´t understand anything of my homework until I´ve watched vid nr 56 and 57.

[@SilenThps]

wow you explained this soooooooooo much better than my professor did. I sort of had a lightning bulb experienced and thought "OOOOOOOO thaaaaaaats why it's called a pure virtual function!"

[@shradhajaiswal1562]

thank u so much Bucky....u r just amazing....Ur videos actually help me to keep on studying computer science....all doubts a just cleared with Ur help...thank u so much...:-D

[@trido3815]

Buckys, you make it very easy to understand. thx

[@romankantor1326]

Your explanations are the best! Thank you for all the tutorials!

[@puffbluesam021]

So much kindness Bucky!! Thank you! You really deserve some Tuna!!!!!

[@jas4768]

Bloody legend. Cheers from London, UK.

[@khaledalhousa6687]

that one of the best in the c++ thanks

[@jaunathang]

9 years later and this saved my semester

[@majedalghanmi7429]

youre a legend youre a legend youre a legend youre a legend youre a legend youre a legend

[@kiva8986]

for (int i = 0; i

[@rushipatel4466]

you forgot to put i++ ;)

[@jerichosharman470]

WOOOHOOOOO SUPER AWESOME VIDEO>>>>..well explained and thankyou

[@abhinavs03]

BUCKY! YOU ARE THE MVP BRUHHHHHH!

[@ServusTuus.]

eres un chingon Bucky!.... eres mi gallo. Muchas gracias

[@sheralikhtk5200]

Thank you so much now i can write something in my exams

[@GoddamnAxl]

good job on the teaching!! really love your vids and helped me a lot. It kills me to see that type "mponster" tho..

[@tristanortiz4054]

Jesus thank you man your stuff is amazing. Regards from canada

[@yikes3796]

I learned more from this tutorial than my Professor.

[@Shahzebnaeemminhas]

Bro love your videos. Stay awesome mate 👍

[@2fatb0y]

I love these tutorials !!

[@gba7613]

Thanks ! a lot.. really we are gaining too much knowledge from ur tutorials ....

[@TysonGill]

[@emmanuelvelez8431]

Thanks for made this videos, it helps me a lot

[@bookdream]

But I wanted another clam =/

[@akashkedari255]

Hey bro a heartful thanks....May god bless you brother

[@ziadhassan7]

I actually enjoyed the Polymorphism videos more than any thing ^_^

[@rabimoshehizskiaavnergolde3195]

same it was easy XD

[@danysvideos]

Thank you! Now I know the difference. Pretty easy!

[@KW-dg6fs]

So basically a pure virtual function is equivalent to not writing a function at all. At least based on this example, all I can think of the use of an abstract class or pure virtual function is that it is just there so when programmers write a derived class, they know they have to write a function of the same type as the pure virtual function.

[@KW-dg6fs]

virtual void attack()=0; if its pure virtual then enemy1->attack() cannot call it as well. I believe, let me confirm it on my IDE

[@katerinadimova6334]

Bucky you're a legend !

[@95shade36]

Thank you for this video, you explained it very well.

[@KenFujimoto]

24,000 views! I'm sure it will be 2,400,000,000,000 someday.

[@gabirodriguez1000]

bruh.. your are absolutely great!

[@gaab03]

first i want to say thanks cause your videos are amazing and extremely helpful. Second I have a question about how to access the virtual functions. Do they have to be called using the pointers or can u declare them normally?

[@mpk0422]

This helps me so much... thank god

[@Sgoose105]

so good better than my professor!

[@omahdezavalos]

What editor are You using is kind the cool the highlight theme

[@GrozaDanut]

So in Java you have to put abstract before a class to make it abstract. Do you need to put abstract before a class in C++ or that class having only pure virtual functions makes it automatically abstract?

[@jerfersonmatos28]

Simple and objective.

[@honestCeylonReviewers]

Awesome and yeah very use full tutorial .. Thank you very much sir :)

[@xamogxusx]

thanks, these videos are the best

[@lijingyan2009]

love u so much, bucky

[@abhijitmit]

Bucky has trained more software engineers than all the universities in the world put together.

[@benjamindoris5236]

I have a quick question! If the pure virtual function does nothing, what's the point of making that function in a bass class? You could just do ninja n; n.attack() and monster m; m.attack() or something instead of creating an Enemy object and calls those functions using that, which saves more lines??

[@preetigodara544]

i think the point is it makes sure that every derived class must have its own attack function , i guess that is needed sometimes

[@z-man1938]

because of what i think is that obviously what the other guy said + pointer makes the programm loading faster . because pointer work from direct memory addressm

[@taneix_tutoriales]

and what guarantees that the enemy can attack, and not to worry the form that will do it and also the type that he is, if he is a lion, duck, owl, or any one he will only attack in the way that he can and another advantage is to be able to group all the enemies in a list. Then if in your game to stay overnight, list all the enemies and call the sleeping function. and a part of what polymorphism does

[@justinek9461]

@Daniel Gladstone thanks!

[@badbytes9644]

The purpose is to define an interface for all subclasses to adhere to.

[@BasicPoke]

Thank you for the video. You are helping me review C++. Note that a pure virtual function can have an implementation, as in the following: class SomeClass { public: virtual void example()=0; //Denotes pure virtual function definition }; void SomeClass::example() { cout

[@hendrixansel9750]

yeah, true. But how is that usefull ?

[@martinhdz07sbcglobal]

You make life so much easier! Thank you very much.'

[@adminos15]

good job Bucky, but why do you use pointers?Are they mandatory?

[@areola_ayatollah]

Yes! This needs to happen

[@aylictal]

in follow up, if i declared the different attack functions into the different abstract classes, it wouldn't matter if it's parent class was empty would it? it should still work just fine? what's the point in the pure virtual function? i still don't get it.

[@yashaswigowda3535]

amazing videos!! Thanks a ton :)

[@ragnarw.eliansson5299]

Be sure have a the brackets behind enemy lines.

[@WowDailyDose]

Hey quick question, this is kinda off topic but in your Main When u created a Ninja n and monster m, why did you have to then create an enemy pointer to refrence them? why couldnt you just do n.attack();

[@anamaykane9355]

If a pure virtual function *has* to be overridden, why does it have to be declared in the base class? We could just have functions with the same name in each of the derived classes.

[@TheCrapStudio]

his motto is free education. Read the about section on his website

[@degenerategambler000]

forsome reasons it worked in visual studio '15 when we delete 4:44 this part of code ?

[@alexanderzhu1415]

Yeah, it just didn't print anything.

[@degenerategambler000]

microsoft = Anti-developer

[@rodrigueskorn]

May I ask you one question Sir. (a small doubt): Can I have mutiples pure virtual functions in my top class? For example: You made the class Enemy, right, then could it be valid if that enemy could speak, punch, kick, shoot or you know a bunch of stuffs like that? Just a curiosity. class Enemy { virtual void attack () = 0; virtual void speak () = 0; virtual void punch () = 0; virtual void kick () = 0; virtual void eat () = 0; virtual void combo () = 0; virtual void fart () = 0; ... } Thanks!

[@ednakazuya12]

In this situation is it recommended to do a separate class?

[@austinbritton1029]

Still useful, thanks dude

[@Samtuga173]

How do i prevent a parent class from being inherited

[@MyStuff774]

is virtual void attack()=0; neccesary? In java you would just write abstract void attack(); without =0

[@eiusamor]

hahaha, you're hilarious. and these are my favorite c++ tutorials!

[@paulaolopes8264]

is construtor needed all the time in classes?

[@blugo561]

What about inheriting nested classes? How can that be done?

[@realm087]

keep the good work!!!!!!!!

[@parison813619]

What if we want to call the base class and than the derive class

[@mariahkhayat7833]

So helpful, Thank you..

[@agnesakne4409]

Why is it not necessary to declare constructors and destructors here?

[@sherifmedhat8625]

You're the best !

[@jambexuk]

By the way, you can't instantiate an abstract class. Also, there are no virtual constructors. Just tried both, didn't work.

[@ruoyigao9826]

Bucky has a new one except for "Pretty cool hum.", that's "Pretty simply hum." LOL

[@sheralikhtk5200]

can we somehow use pure virtual functions? if yes then for what?

[@ayyoubm]

bucky the legend

[@rakshithavishalakshiaswath3143]

does abstarct classes have ONLY virtual functions??

[@RoshanKotian1007]

Hey Bucky, Which compiler do you use?

[@maxim25o2]

Virtual means " If nothing else, then use default one?"

[@adammontgomery7980]

So it's defining an interface where child classes have to implement the pure virtual function?

[@Qazqi]

It is common practice when you need a pure virtual destructor.

[@SeekerofYab]

So is this where "I have no greeting" comes from in NPCs?