[Bug libstdc++/108823] ranges::transform could be smarter with two sized ranges

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108823

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Or decltype(ranges::size(r1) + ranges::size(r2)) ?