[Bug c++/110216] tuple_size requirements for structured binding has not been updated after DR 2386

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110216

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:1a43af04dd62b80f45700f94ed241347263ed773

commit r14-3204-g1a43af04dd62b80f45700f94ed241347263ed773
Author: gnaggnoyil <gnaggnoyil@gmail.com>
Date:   Sat Aug 12 16:16:52 2023 +0800

    c++: follow DR 2386 and update implementation of get_tuple_size [PR110216]

    DR 2386 updated the tuple_size requirements for structured binding and
    it now requires tuple_size to be considered only if
    std::tuple_size<TYPE> names a complete class type with member value. GCC
    before this patch does not follow the updated requrements, and this
    patch is intended to implement it.

    (jason) Accepting pseudonym sign-off because a change this small is not
    legally significant for copyright.

            DR 2386
            PR c++/110216

    gcc/cp/ChangeLog:

            * decl.cc (get_tuple_size): Update implementation for DR 2386.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1z/decomp10.C: Update expected error for DR 2386.
            * g++.dg/cpp1z/pr110216.C: New test.

    Signed-off-by: gnaggnoyil <gnaggnoyil@gmail.com>
    Reviewed-by: Jason Merrill <jason@redhat.com>