experimental feature / proposal: C++26 reflection API ctre::reflect

[mishmish-dev]

Hi CTRE team!

While playing with reflection in GCC 16.1, I have created this module with ctre::reflect:: versions of match, search(_all), starts_with and tokenize functors. They take an aggregate type T as first template arg and fill its fields from positional / named groups on match (returning std::optional<T> or range of T).

They are gated by a separate header include and _cpp_lib_reflection >= 202603L.

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Godbolt example with single-header ctre-reflect.hpp:
https://godbolt.org/z/bfd1njGE8

See also reflect.rst doc and tests.

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I'm happy to discuss how does this fit into the grand scheme of things, the design and caveats. (E.g. the automatic convesion of captures to numeric fields is bit sketchy at the moment.)

Thanks for this awesome library!