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Subject: [Bug libstdc++/100833] ranges::advance should return n when i == bound
Date: Tue, 01 Jun 2021 16:09:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100833

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:d8326291695c0f13124c232ddf4fd34e3310e649

commit r12-1146-gd8326291695c0f13124c232ddf4fd34e3310e649
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jun 1 16:02:45 2021 +0100

    libstdc++: Fix return value of std::ranges::advance [PR 100833]

    The three-argument form of ranges::advance is supposed to return the
    difference between the second argument and the distance the iterator was
    advanced. When a non-random-access iterator is not advanced (because it
    already equals the sentinel) we were returning 0 rather than n - 0.

    libstdc++-v3/ChangeLog:

            PR libstdc++/100833
            * include/bits/ranges_base.h (ranges::advance(iter, n, sentinel=
)):
            Fix return value for no-op case.
            * testsuite/24_iterators/range_operations/advance.cc: Test
            return values of three-argument overload.=