Templates in C++

Thank you to the following Patreon supporters:
- Samuel Egger
- Dominic Pace
- Kevin Gregory Agwaze
- Sébastien Bervoets
- Tobias Humig
- Peter Siegmund

Gear I use:
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[AhmedTahagg]

"By no means is this going to be the only video I make on templates"
- The Cherno 2017

[sigmareaver]

For all the novices out there, I think there's one important thing he overlooked regarding using templates. With templates, you must either write AND use them inside a SINGLE source (cpp) file, OR you must write them ENTIRELY inside a header file. Unlike a regular function or class, you can NOT declare them inside a header file and then define them inside a source file. The linker won't be able to link the templates if you do.

[baaryl]

I love this series. Motivated me to learn c++ and just got my first job as a software engineer. Keep it up!!!

[HanhTangE]

I know he’s an expert in C++ because he can talk about single concept for ~20 min, where every second counts 👍

[VadimMelnicuk]

Simply, the best C++ lessons in existence.

[bgzdevtips]

Another reason you shouldn't want to go too crazy with templates is compilation times. As cherno said, you're basically having the compiler write code for you. If you start having your compiler write a ton of code for you, then be prepared to wait a bit longer for your program to compile.

[someone]

Template = compile time polymorphism

I don't like overuse of template, debugging is a nightmare. I have seen this horror myself.

[Kromush]

Dude, your videos are incredibly well explained, never seen that in any other channel. As a junior C/C++ developer myself, I learn a lot of new things from you. Keep up the C++ series going!! Great job!

[GFXNever]

As a matter of fact, the templates system is turing complete - that means you can actually implement ANY computer program using templates (and that program will run at compile time).
Great video !

[DanielLiljeberg]

The thing I loved back when I started with C++ and learnt about templates (although the syntax can understandably look like drunk talk to people) was the fact that this is NOT some dynamic thing based on some shared base object the entire language uses but still enables you to create equally or more flexible code. By having the compiler generate the needed code for each type you use your templates with you basically add no extra runtime cost. That was awesome to young me.

Another great side effect of how templates work and the fact that the template doesn't actually "exist as code" is that you can have a huge library of templates and it would not actually grow your binary a crazy amount unless you use them all. If it instead was a hughe library of "actual code" your binary would contain them all even if you only used a few of them.

[ToxicityGameDev]

Dude, please don't let this C++ series go for OpenGL, Hope to see them both continue. Keep up the great work!

[YScript]

C++23 made it easier. You can type:

void Func(auto var) {
std::cout << var << std::endl;
}

[leixun]

*My takeaways:*
1. Problem with function overloading 2:02
2. Function template 4:01
3. Class template (variable) 10:06
4. Class template (data type and variable) 12:16
5. Where we may use template 16:10

[raf.nogueira]

I was trying to understand this Templates for such long time, and only now i understand thank you very much !

[ShivamSingh-ueqi]

Really appreciate your series.. The way you explain things is so simple and effective

[MoTharwat-swdc]

Clear, concise and straight to the point.

[mbwilding]

Easily the best C++ resource on YouTube, thanks man!

[koobyroory]

I love your series! I was having trouble in my C++ class and my TA suggested I should watch your videos. It has helped immensely

[namahshrestha]

You sir are amazing..we need more from you. Please do not stop making videos

[LeandroNunesLeandroN]

"This can get really crazy, really quickly" is my favourite quote here.