https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96185
--- Comment #6 from Will Wray <wjwray at gmail dot com> --- Thanks for the comment on approach Jonathan: I'd noticed some collaboration and agreement around previous builtins such as __builtin_bit_cast which is now available in both GCC & Clang (though with some small inevitable divergence of behaviour). Clearly Richard's suggestion to prioritize P1061, with such illustrious co-authorship, is the best solution. I can offer to help on the gcc side. This is the std way to go. This request was borne of some frustration; I miss this facility in C++20. By a hack, Clang happens to support SFINAE on structured binding since v5 - lack of any way to do it in GCC prompted this request. My thinking was that a builtin can see quicker implementation and adoption than std features. This builtin _is_ in support of a std proposal.
