Need the safety of Rust And need some magic of C++

Rust allows decent amount of magic with unsafe

Which is about the most awful thing.

Wait what?! Compile time code is what make most of modern C++ super freaking fast

Nahh C# is cool but I put off easily with GC languages

C# has lots of ways to work without gc

Are you against or do you agree with engineer from Actix server?

Loooooool

Wait what?! Compile time code is what make most of modern C++ super freaking fast

And breaks in even more exciting ways

Unless there is some compile-time code

Rust has it

Rust has it

Yeah Does rust has that awesome support of Metaprogramming as well?!

I don't think so

I put of from Rust after Actix

They are closing the doors rn

Yeah Does rust has that awesome support of Metaprogramming as well?!

To some extent

Yeah Does rust has that awesome support of Metaprogramming as well?!

It does. There are almighty procedural macros and constexpr functions

Are you against or do you agree with engineer from Actix server?

I kinda don't care

It does. There are almighty procedural macros and constexpr functions

Okay How about trying to make some variadics like parameters in a function or a struct?!

Okay How about trying to make some variadics like parameters in a function or a struct?!

Rust has no variadic parameters and that's for good

Rust has no variadic parameters and that's for good

Why?!

It doesn't even has function overload And they don't even have plans to implement them!!!

I guess discussing rust design is outside of this chat's scope 😆

See why I didn't want to give my reasons?

I guess discussing rust design is outside of this chat's scope 😆

Yeah

Rust has no variadic parameters and that's for good

https://doc.rust-lang.org/std/primitive.tuple.html

It doesn't even has function overload And they don't even have plans to implement them!!!

Actually you don't need function overloading when you have generics

Actually you don't need function overloading when you have generics

Okay Why I can't have generics specialization in rust?!

I am new to C++, is reference good for beginners?

struct Object<T>; struct Object<u32>;

struct Object<T>; struct Object<u32>;

Not valid

Unless it's in the impl block

And that's maybe good enough

I am new to C++, is reference good for beginners?

Read one of bjarne's books

https://doc.rust-lang.org/std/primitive.tuple.html

You see the magic of C++ here?! Rust has built-in tuples C++ didn't need to have built-in support It can be done only through bare hands of programmers by using bare hands of ordinary programmers like you and me

I'm not talking whether C++ is better than Rust or not Don't get me wrong ;)

I'm not talking whether C++ is better than Rust or not Don't get me wrong ;)

yes i see

You see the magic of C++ here?! Rust has built-in tuples C++ didn't need to have built-in support It can be done only through bare hands of programmers by using bare hands of ordinary programmers like you and me

I don't really have much experience with C++ so can you show some examples where variadic template parametres are useful?

I don't really have much experience with C++ so can you show some examples where variadic template parametres are useful?

Implementing std::tuple

Implementing std::tuple

what else?

what else?

std::variant It's like enum in rust

ок

ок

The most cool part of Rust is its pattern matching mechanism❤️

Btw There is a C++ pattern matching library out there Here you can check it https://github.com/mpark/patterns

You see the magic of C++ here?! Rust has built-in tuples C++ didn't need to have built-in support It can be done only through bare hands of programmers by using bare hands of ordinary programmers like you and me

Actually I've seen cases in Rust where variadic template parameters were necessary, haha

Actually I've seen cases in Rust where variadic template parameters were necessary, haha

Where? XD

Btw There is a C++ pattern matching library out there Here you can check it https://github.com/mpark/patterns

Even he made it look like built-in pattern matching support

Where? XD

I don't remember, but code looked like foo<A> foo<A, B> foo<A, B, C> …

I don't remember, but code looked like foo<A> foo<A, B> foo<A, B, C> …

Ohh

Hii

Hii

Hi

I am Italian, but I understand something in English. I didn't understand one thing about the rules: can I ask something that I didn't understand about C ++ at school?

I don't really have much experience with C++ so can you show some examples where variadic template parametres are useful?

Like here

I am Italian, but I understand something in English. I didn't understand one thing about the rules: can I ask something that I didn't understand about C ++ at school?

Yes, sure you can You cannot ask somebody to solve your assignment But you can ask questions about C++ you don't get (preferably with googling before asking) and if you faced problems while doing your assignment, you can ask how to solve the problems (google before asking too)

I checked on Google an exercise created in mind, but I found ways that not even the teacher wants. I have to merge two vectors into a third vector. Just to understand how

Tell me if you understand.

I checked on Google an exercise created in mind, but I found ways that not even the teacher wants. I have to merge two vectors into a third vector. Just to understand how

What do you mean by merge? Are they sorted and you want to make sorted vector of two others?

What do you mean by merge? Are they sorted and you want to make sorted vector of two others?

no, just fusion

no, just fusion

In random order?

Or what?

In random order?

Yes, bruh

Do not send pictures of screen

Thanks for helping me understand

Did you understand actually?

Tell me if you understand.

Ez // std::vector<T> v1, v2 std::vector<T> v3(v1.length() + v2.length()); std::copy(v1.begin(), v1.end(), v3.begin()); std::copy(v2.begin(), v2.end(), v3.begin() + v1.size());

Make third vector, copy first, copy second

Ez // std::vector<T> v1, v2 std::vector<T> v3(v1.length() + v2.length()); std::copy(v1.begin(), v1.end(), v3.begin()); std::copy(v2.begin(), v2.end(), v3.begin() + v1.size());

I think it must be v1.size() in last line

Corrected

And shouldn't it be back_inserter?

Ez // std::vector<T> v1, v2 std::vector<T> v3(v1.length() + v2.length()); std::copy(v1.begin(), v1.end(), v3.begin()); std::copy(v2.begin(), v2.end(), v3.begin() + v1.size());

It's UB if you use this

It could, but I created all elements initially

Oh yes

You're right

Other option is reserve + inserter. Only one if T is not default constructible

It's just when you create ArrayList in Java the capacity, not the size

Ez // std::vector<T> v1, v2 std::vector<T> v3(v1.length() + v2.length()); std::copy(v1.begin(), v1.end(), v3.begin()); std::copy(v2.begin(), v2.end(), v3.begin() + v1.size());

We don't use this. I have to use for + if (maximum one support variable).

Rewrite it using for and if then, algo is pretty straightforward

We don't use this. I have to use for + if (maximum one support variable).

void AddSrcToDst(const std::vector<T>& src, std::vector<T>& dst) { // for cycle } int main() { std::vector<T> vec1 {1,2,3}; std::vector<T> vec2 {4,5,6}; std::vector<T> vec12; AddSrcToDst(vec1, vec12); AddSrcToDst(vec2, vec12); }

/ban S A adding members of this group to random channels

/ban S A adding members of this group to random channels

Hey guys can someone help me to create user profile using firebase in web page

Hey guys can someone help me to create user profile using firebase in web page

This is a c++ group

Go to #ot

#ot

Link is dead lol