Using Trait Objects in Rust

The ultimate Rust lang tutorial. Follow along as we go through the Rust lang book chapter by chapter.

Chapters:
0:00​ Intro
00:37 Trait for Common Behavior
5:45 Implementing the Trait
10:46 Static vs Dynamic Dispatch
12:23 Object Safety for Trait Objects
13:03 Outro

#letsgetrusty​​ #rust​lang​ #tutorial

[nko]

Man, it's amazing how easily you make it seem like concepts I couldn't understand. Thanks for your work!!

[TechLord]

For newbies and people from other languages it might be helpful to say that traits are similar to interfaces in other languages like C# and Java - without the field stuff as you noted.
Traits inverse the control - in other languages you define the interfaces first, then let types (classes) inherit them - in Rust you can arbitrarily define and use traits for existing objects (structs) even if you don't have access to the source code.

[ZoroastrianCowboy]

I read the first half of the Rust book. then I found this channel. Watching these videos is way easier to learn Rust with than reading that big book lol. I can just sit back and learn.

[markmcdonnell]

This is such a timely video for me. Really appreciate you explaining why generics aren’t always appropriate solution 👍

[ZigzauerLT]

I hope more people will subscribe. You're creating the best teaching material for Rust! Thanks a lot!

[ShreksSpliff]

Needed this, thanks! I rave about you and I pray that others watch you content too.

[brandonmint]

So glad I found this. I've been breathing my head against a wall trying to use egui and it's spotty docs

[jobrown]

I'm so glad the first language I learnt was C++ (although, that was 6 years ago). A lot of these concepts I kind of know, just rusty :D

[davidk.]

Should make a series going through the traits in the standard library. Would be helpful

[arturkarabekov]

Great video thank you, that's just what I needed to understand

[spiritofage]

у вас дуже гарний і корисний канал, дякую.

[iflbzyi]

Man, i just want to see your channel succeed :(

[herrxerex]

excellent as always, waiting for the cheatsheet

[fewgfwe]

Pretty much same as Golang. Passing interfaces in function argument does the same thing in Golang too. Its a runtime check by go runtime to figure out which object it is vs the generic static dispatch. So, Generic faster than Traits objects, but trait objects have more flexibiltiy in writing clean code

[amoghyermalkar]

Love the video. I have one question :
So in the case of dynamic dispatch, the rust compiler does some computation at runtime and hence we have a runtime cost. But how is a compiler working at runtime? I used to think the compiler after compiling the code is done with its duty and after that runtime libraries do all the remaining stuff?

[adityapoddar]

Great video. After watching the video I feel more comfortable with trait objects. But I am not able to find RFC for "object safe" as mentioned by you in the video. Am I missing something.

[mutantthegreat]

Nice explanation. Still wondering why Box() is needed around the different objects though, I know it has something to do with them being of different types, but still not sure why this further level of abstraction is needed.

[khandarwilliam]

Can you use `Vec<&dyn Draw>` instead of `Vec<Box<dyn Draw>>`?

[inx]

Nice, I remember a comment I made on one of your videos about this!

[leftspace]

what's the addon you're using for auto complete suggestions?