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Subject: [Bug c++/103049] [C++23] P0849R8 - auto(x): decay-copy in the language
Date: Thu, 18 Nov 2021 23:01:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103049

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:93810fd673654db9ff16170624a6d36449eab241

commit r12-5386-g93810fd673654db9ff16170624a6d36449eab241
Author: Marek Polacek <polacek@redhat.com>
Date:   Wed Nov 3 11:04:22 2021 -0400

    c++: Implement C++23 P0849R8 - auto(x) [PR103049]

    This patch implements P0849R8 which allows auto in a functional cast,
    the result of which is a prvalue.

    [expr.type.conv]/1 says that the type is determined by placeholder type
    deduction.  We only accept 'auto', not 'decltype(auto)' -- that the
    type shall be auto comes from [dcl.type.auto.deduct].  Therefore the
    rules are like for [temp.deduct.call], deducing template arguments from
    a function call, so the result type will never be a reference, and we
    decay arrays/functions.

            PR c++/103049

    gcc/cp/ChangeLog:

            * semantics.c (finish_compound_literal): Accept C++23 auto{x}.
            * typeck2.c (build_functional_cast_1): Accept C++23 auto(x).

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp0x/auto25.C: Adjust dg-error.
            * g++.dg/cpp0x/auto9.C: Likewise.
            * g++.dg/cpp2a/concepts-pr84979-2.C: Likewise.
            * g++.dg/cpp2a/concepts-pr84979-3.C: Likewise.
            * g++.dg/cpp23/auto-fncast1.C: New test.
            * g++.dg/cpp23/auto-fncast2.C: New test.
            * g++.dg/cpp23/auto-fncast3.C: New test.
            * g++.dg/cpp23/auto-fncast4.C: New test.
            * g++.dg/cpp23/auto-fncast5.C: New test.
            * g++.dg/cpp23/auto-fncast6.C: New test.=