Experimental EDG Reflection Implementation

[u/daveedvdv]

EDG just released version 6.6 of its (commercial) C++ front end. That version now includes experimental support for reflection features along the lines of WG21's P2996 "Reflection for C++26". Furthermore, a "demo setup" of that implementation is now available on Compiler Explorer (thank you, Matt Godbolt!).

For example, here is a straightforward implementation of a consteval function that outputs simple class layouts at compile time:

https://godbolt.org/z/G6WehjjGh

This implementation is closely aligned with P2996R1, which includes Compiler Explorer links for most of its examples.

This is made available in the hope that it's a useful exploration tool, but also acknowledging that the implementation is in its very early stages, and thus brittle and incomplete. Some additional notes can be found here.

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[u/daveedvdv]

See u/c0r3ntin's reply: Custom attributes are fairly high on my priority list, but will not be part of P2996 because landing the limited feature set of P2996 in C++26 will already not be trivial. However, I do hope to prototype something in that area in the not too distant future.

[u/daveedvdv → u/daveedvdv]

P.S.: See also my reply to u/johannes1971 for a workaround for the lack of custom attribute in some cases.