On Fri, 31 Jul 2026, Jonathan Wakely wrote:
> On Tue, 14 Jul 2026 at 05:30, Patrick Palka <[email protected]> wrote:
> >
> > For segmented iterators, ranges::distance is equivalent to the sum of
> > ranges::distance of each of its segments.
>
> There's no [PATCH v2 2/2] that supersedes this, right?
>
> OK for trunk if this is the right one.
Yes -- series pushed just now, thanks!
>
>
> >
> > PR libstdc++/123211
> >
> > libstdc++-v3/ChangeLog:
> >
> > * include/bits/ranges_base.h (__distance_fn::operator()): For
> > the non-sized-sentinel overload,
> > ---
> > libstdc++-v3/include/bits/ranges_base.h | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/libstdc++-v3/include/bits/ranges_base.h
> > b/libstdc++-v3/include/bits/ranges_base.h
> > index ce1c40fc17f6..7f169feaa6b1 100644
> > --- a/libstdc++-v3/include/bits/ranges_base.h
> > +++ b/libstdc++-v3/include/bits/ranges_base.h
> > @@ -994,6 +994,16 @@ namespace ranges
> > constexpr iter_difference_t<_It>
> > operator()[[nodiscard]](_It __first, _Sent __last) const
> > {
> > + if constexpr (__segmented_iterator<_It> && same_as<_It, _Sent>)
> > + {
> > + iter_difference_t<_It> __n = 0;
> > + std::__for_each_segment(__first, __last, [this, &__n](auto
> > __first, auto __last) {
> > + __n += iter_difference_t<_It>(this->operator()(__first,
> > __last));
> > + return __last;
> > + });
> > + return __n;
> > + }
> > +
> > iter_difference_t<_It> __n = 0;
> > while (__first != __last)
> > {
> > --
> > 2.55.0.141.g55526a1826
> >
>
>
