[Bug c++/104477] New: [C++23] Implement P2255R2, type trait to detect reference binding to temporary

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104477

            Bug ID: 104477
           Summary: [C++23] Implement P2255R2, type trait to detect
                    reference binding to temporary
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jason at gcc dot gnu.org
  Target Milestone: ---

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2255r2.html

The library type traits std::reference_{constructs,converts}_from_temporary
will need a compiler intrinsic to implement.

Apparently clang already has a __reference_binds_to_temporary with similar but
not identical semantics; I think let's see if they plan to adjust that builtin
or add a new one before we settle on a name.