SMART POINTERS in C++ (for beginners in 20 minutes)
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- Опубліковано 30 лип 2024
- A smart pointer is a container/wrapper for a raw pointer. In modern C++ smart pointers are defined in the std namespace in the memory header file.
One big advantage of smart pointers is that they are responsible for deleting the memory that they use, which means that they automatically deallocate the memory when they go out of scope.
There are three types of smart pointers in C++: unique pointer, shared pointer and weak pointer (std::unique_ptr, std::shared_ptr, std::weak_ptr)
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Contents:
00:00 - Intro
00:47 - What are smart pointers in C++
01:39 - Unique pointer in C++
04:10 - Sharing vs moving a unique pointer in C++
06:44 - Unique pointer automatic memory deallocation
11:42 - Shared pointers in C++
15:09 - Shared pointer automatic memory deallocation
18:42 - Weak pointer vs shared pointer in C++
How to install and use PVS-Studio - • How to detect errors a...
Object Oriented Programming - bit.ly/Cpp_OOP_Playlist
C++ Pointers - • C++ POINTERS FULL COUR...
Learn Exception handling - • Exception handling in ...
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#include
#include
using namespace std;
class MyClass {
public:
MyClass() {
cout
Good video.
"deleting code is my favorite part". I LOLed at that one. :)
me 2 hahahah
21:06
hahahah, you are very observant, nice 😁😁
XD
indeed
Great job with different components explaining different types. The pace is very good and it lets the information settle in mind rather than rushing to write some code and wrapping up the video!
You are always strengthening my knowledge in c++ by making videos on key concepts. Your videos are very understandable.
Nobody explains a hard to understand topics in a easy way like you do. THANK YOU 😌 Saldina
More I watch Saldina's video more I want to watch. I am assuring you it's not love it's attachment to her pace and the way she explains ❤️
❤️❤️
I often find myself going back and rewatching her videos just because of how thoroughly she explains things.
I was always getting confused about smart pointers . You helped me alot. Great JOB!!!!!!!
You're welcome! That's great to hear! ❤️
hi ma'am. I have been watching your videos to refresh my memory in C++, and I must say that you teach so well. thank you for this content!
Beautiful! beautiful! Short succinct examples and clear short explanations.
Hey Saldina! Hope you're doing well.
Great video, I really appreciate that you are making this kind of content and I feel so glad that I bumped into your channel quite a while ago.
And to answer your question in the video, YES, please teach me (and your audience) how to work with C#. It would be really cool to learn from a person like you...
I already enjoy your C++ videos very much (as nobody managed to clear the finicky doubts in my head as much as you could) and I very much look forward to a playlist with videos on C#.
Take care...
With warmest regards,
Your admirer.
Thank you so much for this video. I literally was studying a lecture about smart pointers and I did not understand anything at all. But now it's much better!
Great explanation! I'm coming from Java background and was taking it's memory management for granted, but now after learning how c++ handles pointers I'm full of "a ha!" moments. Thx
I loved the way you have explained. Very simple and detail.
I really become happy whenever I search a topic and see you teaching that...
very Helpful Content i recommended your channel to my friends and My Group Community .. keep going Mrs. Saldina 💻
17:44
I think that at the end of the declared scope, the second pointer is going to be de-allocated and use_count() will return 1. Btw, Just saying, this is going to be really useful, I really hated having to try and figure out all the stuff with de-allocating pointers, thanks a lot, best coding channel on UA-cam
Edit:
24:14
I expect that wePtr1 is going to be equal to NULL
Hello Saldina.
First of all, this is one of the good introductory material for smart pointers I've ever seen so far. It is very helpful. I just have a small feedback.
Moving unique pointers mentioned in 6:37. It is pretty much like this but a subtle difference under the hood: std::move does just casting so that moving can be done properly with unique_ptr's move constructor.
I told this because after watching that video people can think "Oh using only std::move provides moving and I don't have to think about anything else, thats good!" Thinking in that way can be misleading for further learning progress.
Honestly, all you explained in this video are phenomenal pieces of information but the way you explained it to us is marvellous. Please keep up this good work. Thanks a lot for the precise yet effective video.
did you mean to use "and" im confused
Thanks for your videos. They're very clear and easy to follow.
And also you're smarter than a smart pointer :)
Can you please make some videos about Lambda function, Template function and mutable vs const ? Thanks :)
C# videos would be great, thanks!
🥰🥰
Great job! Unfortunately, my experience has shown that many people who deal with smart pointers need to have a rough understanding of how they work under the hood: these are stack-allocated objects that wrap pointer-like logic. This distinguishes them from the classic pointers. For example, the 'operator*' function is overridden, so that (under the hood) the * operation emulates how classic pointer work, by retrieving the REAL pointer the smart pointer OBJECT manages. But, you should always keep in mind that these are objects that refer to allocated data INDIRECTLY. When you stream the pointer using the 'operator
Actually I can't even console out smart pointer using
Thank you so much for the high quality videos.
Great job
you always increase my information in cpp
Thanks a lot
keep uploadind video related to cpp advanced topics
Very well explained. Thank you and happy new year.
Watching from PH 🇵🇭
Greetings for you! 🇵🇭❤️
liked the detailed explanation of concepts and different aspects
Saldina ,Thank you help to improve my knowledge. I am proud of you 🎉️🎉️🎉️🏆️
C# like, JavaScript comment
React ❤JS
c# please
C# please.
C++
C# first then JavaScript
Hi Saldina,
Thank you very-very much for your great work on this channel!
I will be appreciate if you will make some lesson about multi-threading.
This is so good! Thanks a lot!
Amazing explanation, thanks!
Great explaination ma'am
Thanks for liking 😃❤️
@@CodeBeauty no ma'am thanks for making this video ☺.
Thanks for a very detailed explanation. Very helpful!
You're welcome 😀😃
Tu Español tiene un acento muy lindo. Tu eres una señorita muy inteligente , te felicito tus videos son muy buenos.
Great explanation. Thank You.
very nice teacher! Thank you!
It will be great if you mam teach us both or C#
So C# first and then JS 😁😁
@@CodeBeauty thank you for considering both
Excellent Analysts... 👍
So clear now! you saved me, thanks a lot!
Glad I could help! 🥰
thank you, i finally know how the weak pointer is working
Thanks for the well explained video. I am developing a program with intent to be memory safe and smart pointers is the way
Also, could you please make a video about chrono(date and time)? I've read some documentation but i cannot figure out how to efficiently work with date and time with c++
Very useful content regarding c++ on whole internet
this is the best channel omg
Thank you!
EXCELLENT !!!
When i started watching your vids you barely had 5k subscribers but your hard work payed off Saldina 78k wew congratulations keep growing up
I remember 🤗 Thank you! 🙏💙
Can you make video on the projects a fresher should do to include them in a resume.
I would like this as well, thank you mate
A few years ago I was scouted and invited to work for Google. I can share my experience related to the knowledge that was required to get a Google Software Engineer job. 😀😀
@@CodeBeauty yes mam it will be helpful for us
Hey u really make my CS degree easy and understandable. Can u please make a video on simple c++ projects or games ?? Atleast one project
I just want to understand how can we make easy console games in c++ .
Hey Saldana ...I'm impressed with ur teaching...pls make session on C++ STL
LUVE this!!
I love the change to dark background.
Would be great to make C# videos!
you just gained a new follower
Thanks for the video. it is nicely done. Just to clarify, in the first example, I guess the destructor would be called regardless of using smart pointer or not? !!
thank you very much for your effort really it is not easy but can you explain how we can use them in our live programming. second
can you ,if your time is available, explain how I can get the cursor (mouse) position from monitor and use it during the program running.
O my goddess,
Lovely tutorial.
Your tutorial is as beautiful as you are.
Thank you Saldina. Lots of love 💖 from Indian C++ Developers.
you are doing a great job. Thanks for your videos. Take care of your self, do not hit your arms again......
☺️🙏💙
thank you :)
Would love a video on c++ move operations.
Yes please, do lessons for C# (sharp) : )
Thank you!!!
You're welcome! ❤️
Otro excelente video, eres la mejor profesora de C++ en UA-cam :)
Te lo agradezco mucho! 😃😃
Nice, Video! Summary: When the owner goes out of scope, the memory (object) is destroyed. unique pointers have only one owner. shared pointers have multiple owners and keep the object alive by using counting the owners. Weak pointers are not owners which means they won't keep the object alive.
Hey codebeauty can you plz tell me which book you use to learn to code beautifully ? 🙂🙂
Please do create C# videos that would be a great help
Can you tell sth about difference between weak ref and strong ref? And when should we use weak pointer? Thx
What are your thoughts on the Eclipse IDE if you know about it?
this video is good
Please make some video on C# specially advance topic such as Events, Delgegate, AppDomai and it's Design pattern things as they as hard part for home alone.
Pl. consider giving separate serial nos for each session (eg:Cpp001) along with the description
Something I don't really understand though is how to pass smart pointers to other functions - I know I can pass them the same way as a raw pointer, but I've heard passing by reference is preferred. So if I defined a smart pointer (lets say a unique ptr) and then dereferenced it and passed the dereferenced value to a function which was taking a reference, would this then break the smart pointer or is that fine? Can I then assign to this reference? Thank you for the video though!
Hi Saldina, I really love your videos and I did learn a lot about C++, thanks a lot for what you do for all of us.
Questions about smart pointers, OK I understand the concept... but when and in which occasion to use them? Could you explain in which occasion we should use them because to be honest I really don't know... maybe I should have use them but for me it is not obvious in which occasion I should use them.
Do you have examples showing in which occasion they should be used?
same problem..
Hi from France.
I've been watching quite some of your videos.
That is the first one I got lost.
I guess, the reason is I don't see what advantages smart pointers allow and in what situation where to use them.
Hi saldina,
i want to ask you a question.
When i write the unique_ptr code in line,after line i cant use cout
Wait a bit but if you delete system("pause>nul"); you will be able to have "Destructor invoked" so that was the problem right ?
Plz make some more videos about structure data
Data structures or structured data 😁😁
what are the difference and similarities between weak pointer and unique pointer same ?
any problems with doing auto ptr = std::make_unique(69); ? Saying the type twice feels kinda redundant
At the very end of the video; if the integer 25 was deallocated when shPtr1 goes out of scope how can the debugger read its value to be still 25 (via wePtr1)?
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❤️
Hello this video explains smart pointers very well thanks. But it's missing the distinction between smart pointers and regular pointers.
I feel I can use regular pointers instead. I just can't understand the usecase difference here. Maybe a topic for a future video. Thanks
Hello Saldina. How do we know in which situations we need to use regular pointers or smart pointers?
I'm linking a stack overflow post related to your question. Hope it helps you understand better 😃😃
stackoverflow.com/questions/6675651/when-should-i-use-raw-pointers-over-smart-pointers
Hi What is **ptr in pointer variable how is it being used in programming c++
As the two shared pointers are created in that scope, after that scope at line 23 we should get null pointer exception. Let's see what really happens...
How did you print the address of the unique pointer? Because when I tried, I got a compilation error that there are no matches for the operator
Hello, how to make shared_ptr return a different memory address for an X pointer each time it is called?
You are making very nice video❤ , just one suggestion keep camera focus on face .As audience , our attention goes to unnecessary hand movements
what is the use of weak_ptr? Just for observation of the dead things?
Dear Saldana where these share pointer etc to be used in real life programs. Please explain with example.
Her Smile...please, Smile++!, delay(20000); Thanks, really helpful!
Mam I want data structures and algorithms full course in c++ like you have uploaded c++ for beginners full country earlier
Please mam do it 🙏
can you explain , how to use unique pointer for files ?
Ma'am please explain SQl tooo please.
no constructor and destructor calls from weak_ptr because it can not be used to allocate memory
Saldina is not just developer. She is saint developer)
😅😇🥰
So us understood, a week_ptr will keep just address the first element of memory, and if we try to get data, which was destroyed before, we will get a trash or null ref exception or segmentation fault?
I guess we will have a trash. Am I right?
i have a question when i tried to print memory address of ptr1 it throws me error then i need to add &ptr1 to give me memory address but while watching vid i see you didn't mention &ptr1 but still you got memory add how does it happening i'm also using vs ???????? time 3.44 in vid
"deleting code is my favorite part of coding" ... YES I AM NOT ALONE!!! when deleting something and the needs are still covered, the world just became a better place 🤣
💯💯🥰
Could you add on ppltasks library
When we assigned a share pointer to a week pointer then the owners should be two in that scope. But it's showing as only one owner .
How is that possible?