[PATCH] libstdc++: implement tuple protocol for std::complex (P2819R2)

[Giuseppe D'Angelo]

Hello,

The attached patch implements the tuple protocol for std::complex (added 
by P2819R2 for C++26).

Tested on x86-64 Linux. Beware that you need the latest GCC trunk, 
otherwise you'll get an ICE (PR 119045).

It's also on Forge here

https://forge.sourceware.org/gcc/gcc-TEST/pulls/34

together with a workaround for the ICE (please ignore that, the GCC 
mirror hasn't synced the proper fix just yet.)


Thank you,
-- 
Giuseppe D'Angelo
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