Smart Pointers in C++ (Stop Using new?)
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- čas přidán 28. 06. 2024
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Smart pointers can be a complicated subject, especially because there are multiple types! In this video we will talk about when you should use a smart pointer, and how each type works.
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Timestamps:
00:00 - Intro
00:45 - Old School Pointers
02:00 - When do you Need Pointers
03:53 - use New
05:27 - Shared Pointers
07:30 - Other Smart Pointers
08:56 - Unique Pointer
09:39 - Smart Pointer Functions
11:45 - Weak Pointers
13:17 - Dereferencing a Weak Pointer
14:57 - Circular Reference
15:46 - Review
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I hope this was helpful! Here is the course link I mentioned in the video. New C/C++ course: calcur.tech/c-cpp-newsletter
I do not know yet how to pass unique_ptr as reference to a function.
void whatever(...,std::unique_ptr &engine);
- - -
The call: whatever(engine).
It should work, but do not compile.
let's go. This is what we need. Been using your lessons for learning anything. So far been great. thanks.
11:27 cracked up so hard. I do this all of the time when making videos.
Edit: wth? How did that even compile at 13:12. You have to declare the data type when making a shared pointer. Weird.
As great as always. Cannot wait to see the course.
Thanks!
As somebody who learned and uses mainly C++98, I'm glad to see videos about these newer C++ concepts I often forget about. 👍
Very well done. There were other videos on smart pointers that left me a bit confused. Yours is clear & understandable. Thank you
Thanks Caleb. Very clear examples and explanations.
This video is very helpful, it's make me figured it out in one video huge thanks!
Great tutorial! Thank you
Awsome. Thanks!
Best video for smart pointers
Great bro🎉
Hey good presentation Caleb!
Thanks!
hey bro. Please do a java springboot video or course?
so unique allows one owner
shared allows unlimited owner
and weak one makes 0 owner at total and we need least one owner to keep scoped value alive, did i understand correctly? if i am not someone correct me please.
This is one of the best coding tutorial videos I've watched. Clear, concise and complete. Thank you so much for your great work!
Why you using camel case btw and more can you make a video how to setup an editor for c++ development
Hi Caleb
i ran shared pointer example.its giving error .
error:smart_p3.cpp:6:34: error: conversion from ‘’ to non-scalar type ‘std::shared_ptr’ requested
6 | std::shared_ptr a= std::make_shared;
during compilation . which c++ compiler ur using..
I tried this on g++: gcc version 9.4.0
Please guide
Thanks
Abhishek
You have it should be (5)
It looks like it thinks you are trying to use a function for the type because you put the () inside the
thanks alot caleb(@@codebreakthrough ) it work for me..
cystall clear!
P.S. Love the content
The level of abstraction is on a really akward level.
On one hand yeey nice, you don't have to delete pointers manually.
On the other hand, if you need to do anything more advanced like cloning, deep and or shallow copy and storing in containers, that requires even more work, knowledge and frustration than managing raw memory directly.
I find using smart pointers in very simple situations, where it's not necessary at all and in complicated situations I use raw pointers, just because I hate thinking about the obscure behavior of smart pointers.
Isn’t that what smart pointers?
Smart pointers are a fairly thin wrapper in terms of added complexity. It's not a huge difference in understanding to use them as opposed to raw pointers, and the benefits of clearly defined ownership and automatic deallocation is monumental for the little abstraction.
To me though, something that bothers me is just how verbose it is. Going from * to std::shared_ptr is a pain in the ass. Especially when you're making collections of smart pointers or the like
with automatic memory safety comes overhead
4:39 WRONG! 2 memory leaks.
Don't use auto in production code, the rest is good, but auto can make bad assumptions when you start getting into nested data types and other techniques that come up in production code. auto is dangerous and could lead to bad assumptions by the compiler.
bro thinks hes mcoding💀💀