Special Interest Group on C++

Teaching, learning, and practicing modern C++

Moderated by @smurthys

Mastodon: @[email protected]
BlueSky: @sigcpp.bsky.social

[Special Interest Group on C++ @sigcpp]

Reminder: SIGCPP is also on Mastodon. We'd love for you to follow us there. Or you can just read our posts there and you won't even need a Mastodon account. 😉

PS: SIGCPP posts continue on Twitter as long as the site is free and makes sense to stay. 🤞

https://t.co/iHXB8OmivT

[Special Interest Group on C++ @sigcpp]

Reminder: SIGCPP is also on Mastodon. We'd love for you to follow us there. Or you can just read our posts there and you won't even need a Mastodon account. 😉

PS: SIGCPP posts continue on Twitter as long as the site is free and makes sense to stay. 🤞

https://t.co/iHXB8OmivT

[Special Interest Group on C++ @sigcpp]

Logan Smith illustrates the pitfalls of using C-style casts in C++ code. Bottomline, instead of C-style cast, use an appropriate C++ cast such as static_cast and dynamic_cast depending on the situation.

https://t.co/kVOU88cpZJ

#cpp #cplusplus #programming #video

[Special Interest Group on C++ @sigcpp]

"The Evolution of C++ - A Typescript for C++"
- Herb Sutter, CppNow 2023

https://t.co/d5hzVSdDKV

#cpp #cplusplus #cpp2 #cppfront

[Special Interest Group on C++ @sigcpp]

If you're a CS student/faculty in India, Africa, or South America, and are interested in a SIGCPP event on your campus, pls DM to discuss topics, schedules.

And thx @CompileExplore for the awesome service.

https://t.co/MA5QFK8fzO

#cpp #cplusplus #teaching #learning #education

[Jason Turner @lefticus]

It's been >6 years now since @ben_deane and I presented "constexpr All The Things!"

And 6 years of C++ Weekly and conference presentations about constexpr...

And I'm finally seeing a shift in conversation from "why do I need constexpr?" to "of course I need constexpr!"

[C++Now @cppnow]

Let’s Talk About C++ Abstraction Layers - by @Inbal_l - CppNow 2023

https://t.co/irkm3fnoLC

#Cpp23 #Cppabstraction

[Jason Turner @lefticus]

Just published my 35th video about C++ lambdas!

Why?

Because lambdas follow the evolution of C++. If you fully understand lambdas, you understand most of the core of C++!

The last episode is about a new C++23 feature.

https://t.co/U5WKaLsZCt

[@[email protected] @shafikyaghmour]

New blog post "Let's enumerate the UB": https://t.co/Y3glZ0VzuR

#cplusplus

[Jason Turner @lefticus]

Alright team, we can do this!

Retweet if you know anyone who is not currently a subscriber of C++ Weekly!

https://t.co/4Ijear2A8z

[GCC - GNU Toolchain @gnutools]

strlcpy and strlcat added to GLIBC 2.38 by Florian and Siddhesh. Great work. Continually improving.

[Special Interest Group on C++ @sigcpp]

Some C++ exercises and code of interest:

https://t.co/PapIUljl75

#cpp #cplusplus #programming #education #learning

[Special Interest Group on C++ @sigcpp]

Exact performance difference is implementation dependent but Approach 2 is most certainly faster due to avoiding initial copy.

The std requires Approach 2 to be linear in the distance between iterators and so it will be odd for Approach 2 to be slower.

https://t.co/JKKnABbslM

[Special Interest Group on C++ @sigcpp]

If you need a string to be the reverse of another:
1. Copy source and reverse the copy, or
2. Create a new string inited from reverse iterators on the source

Approach 2 can be faster, and the new string can even be const.

https://t.co/MQf6BqDPFe

#cpp #cplusplus #programming

[Special Interest Group on C++ @sigcpp]

@idoccor See reply to OP about a note on std::to_underlying.

[Special Interest Group on C++ @sigcpp]

Use templates like these if you have many enum types and you often convert to integers. The 1-arg template converts enum type to its underlying type.

PS: std::to_integer converts only from std::byte and the integer type must be explicit.

https://t.co/RXalTPVnEX #cpp #cplusplus

[Jonathan O'Connor @ninkibah]

To C++ folks, should pass by value arguments be marked const if they aren't changed in the function?
#cpp

[Jason Turner @lefticus]

I'm toying with making a list of C++ Tricks, Tips and Tidbits. They are intended for like one of those pop up "did you know?" dialog boxes.

https://t.co/EFuVwazTQP

Add some via comment or PR if you are interested!

[Special Interest Group on C++ @sigcpp]

C++23 std::to_underlying converts enum to underlying type, which you can then cast to other type. The to_integer templates ☝️ do all that with a uniform interface, but they may not always be the right choice. As OP says use such templates to suit needs.

https://t.co/dsRgDFZK3d

[Special Interest Group on C++ @sigcpp]

@incomputable I much prefer a to_integer function (template) to expressly convert an enum.

Something like this:
https://t.co/9xUBi1Cv0d

[Special Interest Group on C++ @sigcpp]

Use templates like these if you have many enum types and you often convert to integers. The 1-arg template converts enum type to its underlying type.

PS: std::to_integer converts only from std::byte and the integer type must be explicit.

https://t.co/RXalTPVnEX #cpp #cplusplus

[Special Interest Group on C++ @sigcpp]

@incomputable 🫡