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Subject: [Bug libstdc++/91456] std::function and std::is_invocable_r do not
 understand guaranteed elision
Date: Tue, 16 May 2023 12:50:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91456

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:5c02a8eca7bcbe0ee021eddd5f764e8bfcb13b03

commit r11-10775-g5c02a8eca7bcbe0ee021eddd5f764e8bfcb13b03
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Sep 23 13:28:37 2022 +0100

    libstdc++: Fix std::is_nothrow_invocable_r for uncopyable prvalues
[PR91456]

    This is the last missing piece of PR 91456.

    This also removes the only use of the C++11 version of
    std::is_nothrow_invocable.

    libstdc++-v3/ChangeLog:

            PR libstdc++/91456
            * include/std/type_traits (__is_nothrow_invocable): Remove.
            (__is_invocable_impl::__nothrow_type): New member type which
            checks if the conversion can throw.
            (__is_nt_invocable_impl): Replace class template with alias
            template to __is_nt_invocable_impl::__nothrow_type.
            * testsuite/20_util/is_nothrow_invocable/91456.cc: New test.
            * testsuite/20_util/is_nothrow_convertible/value.cc: Remove
            macro used by value_ext.cc test.
            * testsuite/20_util/is_nothrow_convertible/value_ext.cc: Remove
            test for non-standard __is_nothrow_invocable trait.

    (cherry picked from commit 71c828f84572d933979468baf2cf744180258ee4)=