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> Second, conforming compiler and standard library implementations are coming quickly. Throughout the development of C++26, at any given point both GCC and Clang had already implemented two-thirds of C++26 features. Today, GCC already has reflection and contracts merged in trunk, awaiting release.

How far is Clang on reflection and contracts?

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Clang’s C++2c implementation status page simply says “no” for both reflection and contracts. GCC’s says “yes”.

https://clang.llvm.org/cxx_status.html

https://gcc.gnu.org/projects/cxx-status.html

That much I'm aware, but that's just about feature availability. I was wondering how far the implementations have progressed internally, despite the features being unavailable.

Clang basically doesn't implement anything regarding reflection right now. There is some support for parsing (https://github.com/llvm/llvm-project/blob/main/clang/test/Pa...) but that's it. There are some open PRs for other parts though.

Thanks, yeah, I was worried that might be the case. Given how complicated these features sound, it makes me wonder if they're gonna finish before the decade is over...

Bloomberg has a clang implementation of reflection: https://github.com/bloomberg/clang-p2996

It has been on compiler explorer for a while

This has been used to add reflection to simdjson

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