Pointers and Dynamic Memory in C++ (Memory Management)
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- čas přidán 17. 03. 2012
- An introduction to using dynamic memory in C++.
Concepts:
Why we may need to allocate memory dynamically?
new operator
heap (free store)
pointers to reference dynamically allocated memory
delete operator
garbage
dangling pointers
thanks man, hats off sir.
I wonder why we pay our universities and end up learning free on CZcams😒
Because there are stupid people out there want paper signed by University
@@Guest-gy9vp hell yeah
Why job market wants that fucking papr signed by fucking garbage university
It's because you guys never concentrate during your lecture.
Don't know if you are trolling or for real.. Universities exist to guarantee a certain quality standard, if you have a degree there is a guarantee that you meet those standards and know specific things.. There is no standard for people who learn online, they might be geniuses, but could also be "garbage" programmers.. ;)
@@DonSanchezDK but as an employer you can make interviews or tests ,if the employee pass ....that is a proof he know things necessary for the job...so there goes the purpose of college !
DUDE I literally got a 100 on my exam because it was based off of memory diagram questions. Thank you!
Nice 👍🙂
@Abhinav Rao LMAO
@Abhinav Rao bruh moment
@Abhinav Rao do u think people should work infront of the computer 24/7 to use their programming knowledge?
@Harsita's Kitchen do you code while cooking?
at 6:48 he crack me up every time.
Describing all the code I've ever written.
hahahahahahhaha
I've been reading Dr. Bjarne Stroustrup's book on Programming and referring to your videos often. I must say that I wouldn't probably be able to go through that complex book if it weren't for your clear, really lucid explanation of concepts. Thank you so much!
This video is 7 years old and it is the best explanation I've yet encountered on this topic. Thanks.
This was the best educational video of explaining pointer and dynamic memory. Everything about pointer and dynamic memory is so much clearer now. Cheers !
Super clean and easy explanation. Absolute masterpiece if anyone wants to understand pointers, dynamic memory allocation, stack and heap.
i ‘ve watched many best tutorials but this one made my way clear that i won’t ever forget how stuffs are allocated in the memory. Thanks sir
Just started programming and c++, memory was the first topic that I would first struggle to understand and get my head around and this video really helped :) thank you so much
I have never seen anyone explain this more clearly in my life. You are amazing!
Your efforts are paying off for more than 10 years. This video helped me a lot. Thanks !
Very informative! Really liked your drawing of the 'heap' and the 'stack'. Made it much easier to understand what is going on.
I was debating dropping my major until i found your videos, thanks for the help/motivation!
Those illustrations were SOOOOO helpful. Thanks!
Thank you so much for the tutorial. Dynamic Memory Allocation has been kind of a plateau in my C++ learning, and you explained it very concisely. Very well done.
Since C++11 You should not set a pointer to NULL, but rather to "nullptr".
+Peterolen or use 0 and use it in c++1002059
=0 isjust fine anyway.
Zoran Jovanov Not really. It was replaced for a reason. Imagine having two functions, void Func(string* aStr) and an overloaded version called void Func(int aNum).
If I call Func(0) or Func(NULL), Func(int aNum) will be called. But if we call Func(nullptr), then Func(string* aStr) will be called, which we want as we're dealing with pointers.
NULL is just constant of 0 difference is NULL is defined with #define and nullptr is a const variable it was replace just to tell you that you are assigning it to pointer and to avoid some memory leaks :)
Scias
yes but i ment only when u delete pointer so it wont be dangling =0 is just fine.
i got the clear idea of what is heap and how to handle new/delete operators and that too dangling pointers and garbage collection. Thanks for this lecture.
Excellent explanation with the graphics. Please make more videos. Thank you
Taking reference from your videos and C++ Primer both, best learning combo ever!
Woww😲 had been struggling with this topic for months.. well explained..Tysm.. you're awesom!!!
This helps me to understand the operations of 'new' and 'delete' . Thanks.
This is a great video, the drawings really help to make the concepts and idea take concrete form for a begginer
He is so simple in explaining complex concepts. thank you
I love the drawings!
You helped me understand what a stack frame is! Thanks!
Excellent video. You really capture the big ideas well.
finally understood the concept...this video helped me a lot...
Thank you so much bro! Your drawing and interpretation of heap & stack made me understand the whole thing :D
One of the best explained topic I ever seen
Thank you so much. I watched a few of your videos today, and I found them very helpful. Clear and concise, really impressive!
Such an amazing amazing amazing amazing amazing amazing tutorial...hats off
Wow. explained in such simple terms. Thank you so much.
Thanks for the video! It's a lot easier to program codes in c++ using memory allocation with your explanation visuals in mind! Thanks a lot! :D
Excellent for someone working closer to the hardware and memory!! Great video. Keep it up
Thank you very much.
You really helped me. May God guide you and increase your knowledge .
Very informative video! Thank you so much!
You are incredible! Great presentation! Keep it up!
very precise and informative!!~ thank you so much!!
The best video I've ever watched about pointers
very clear clarification. Thanks man
best pointer explanation ever :D
Very informative video! Keep it up.
Short and informative, thank you!
best c++ fundamental videos on youtube
thank you so much I never get to understand pointer as I did this time, thank you again
This was crystal clear .Thanks
the best 13 minutes of my life
This was a great explanation. Thank you!
great job! thanks so much for making this video :) helped me with my homework
Thanks for the video its NUTS & BOLTS :). I am trying to learn how to make a program and everyone says C++ is powerful because of memory management, but now that I am learning it they keep getting away from the nuts and bolts and pretty soon everyone is talking about packaging everything into things already programmed in other things... boxes within boxes and which box to use... Before too long I don't even know what nuts and bolts are actually in the boxes or anything from anything. So thanks
Thanks for such an easy explanation
Awesome explanation
I loved your explanation. Thank you!
Wow great video! I completely get it now :) Doing a quick review, haven't touched this material in a while haha
I removed a comment by mistake. Apologies to the user that left the nice comment. I had replied "Thanks!" to your comment under my other account and wanted to reply under my ReelLearning account. Deleting my comment, deleted your comment, for some reason.
a legendary explanation. thank you sir.
Amazing explanation. Thanks
very great explaination. thank you
Great explanation.
excellent explanation!
I love your tutorials. You explain thing soooooooooooo clear. Thank you soooooooooooooooooooooooo much.
Agree, finally understood the concept
The "garbage", i guess is called "memory leak". Good video!
Thank you so much for your effort man! your doing such a great job...
I have only one question, is there any way to get your notes for the videos you ?
Thank you! You really explained it well and it helps me a lot in studying :)
The stack memory is managed by the program/compiler
Dangling pointer = pointer that points to something that no longer exists.
you can assign a dangling pointer the value NULL or 0
When a function exits its memory on the stack is deleted.
Thank you so much for offering high quality tutorials!
+Forever Alone Studying for the CS final? lol
What?
+Ferris Bueller yes, this is part of my last assignment and will make up most of the final
Thanks man, really good explanation!
Great explanation. Is it possible to find size of the reserved memory for a specific variable in heap? For stack, it is sizeof() but what would be the case for heap????
Thank you for explaining it so well!!!
Thank you. I understood everything you said.
Thank you so much! I finally understand why pointers are useful! I have been facepalming over them ever since I first read about them.
Very Useful. Thankyou
my cpp dll is creating a dynamic array, and the call from exe is getting back the pointer pointing to the dynamic array. The problem is that the returning pointer is null every time. Even though the pointer is pointing to a array in the dll.
How can we solve this problem.
What happens if u store p on a vector, then creates a new p and stores it in the vector, can u access both?
You are just awesome! thank you so much!
so can I write
int *p = new int;
*p=5;
p = NULL;
and skip ( delete p ; ) line like that ?
Greate explanation.
outstanding sir.
really nice article about memory
Hi :) thank you for such a wonderful lesson.
Just a quick question: is there a to get *p to point back to memory address 500? Like say for instance we point to 500 (after we allocated space at address 500) and then we point to 700 ((after we allocated space at address 700). Can pointer p point back to 500?
Soo, if I make normal variables I do not need to delete them right? And I think it is hard to understand when I should make variables on the heap and when not to. It's easier to always do 'normal' variables.
4:31 That voice crack though haha
Holly shit you explaint it like no other, literally 15 min and I understand it all now! Thank you!! :D
Thanks, this was a really good explenation.
Newbie here, why would you use a variable in the heap and not the stack?
this video explains alot. however, as a beginning, I still have a few questions.1. Variables stored in the stack DO have variable names and variables stored in the heap DO NOT have variable names, correct?2. What is the advantage/disadvantage of storing variables in the stack vs. in the heap?3. This is probably a stupid question, but why is it necessary to have a stack and a heap? Why can they not be considered one and the same? Then pointers would not be necessary?
So if heap memory cant cause only program polution by garbage and other problems why are we using it?
OOOOHHH MYYY GAAAADD! Pointer's too simple now that I learned it from u
thanks friend greetings from Colombia :-)
Very good, i like it much !
really really really helpful! thank you!
Great video
Just wanna ask to use memory allocation did you use new or malloc, because it makes me confuse with java
I finally understand this concept
Trying to change how memory allocates In a game for a mod. How would I do that?
Very very good.
Thanks
Yea nullptr uses in C++ from the book. Very good video very clear. Better than the book.
This is great man thanks a lot
I have one nooby doubt.. What if we assingn pointer p value as,
int x = 5;
int* p = &x;
cout
History
In 1955, Soviet computer scientist Kateryna Yushchenko invented the Address programming language that made possible indirect addressing and addresses of the highest rank - analogous to pointers. This language was widely used on the Soviet Union computers. However, it was unknown outside the Soviet Union and usually Harold Lawson is credited with the invention, in 1964, of the pointer.[2] In 2000, Lawson was presented the Computer Pioneer Award by the IEEE "[f]or inventing the pointer variable and introducing this concept into PL/I, thus providing for the first time, the capability to flexibly treat linked lists in a general-purpose high-level language".[3] His seminal paper on the concepts appeared in the June 1967 issue of CACM entitled: PL/I List Processing. According to the Oxford English Dictionary, the word pointer first appeared in print as a stack pointer in a technical memorandum by the System Development Corporation.
en.wikipedia.org/wiki/Pointer_(computer_programming)#History