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Jonathan Wakely c351a240ad libstdc++: Make ranges::distance work with volatile iterators (LWG 4242)

This implements LWG 4242 which was approved in Sofia 2025.

I don't think the change from static_cast<const decay_t<I>&> to just
static_cast<decay_t<I>> is observable, but it doesn't hurt. What fixes
the problem identified in the issue is the is_array_v check, which
avoids the static_cast entirely for volatile-qualified iterators.

libstdc++-v3/ChangeLog:

	* include/bits/ranges_base.h (distance(It&&, Sent)): Only decay
	arrays to pointers when the type is actually an array, as per
	LWG 4242.
	* testsuite/24_iterators/range_operations/distance.cc: Add test
	for LWG 4242.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>

2026-03-16 22:04:23 +00:00

backward

Update copyright years.

2026-01-02 09:56:11 +01:00

bits

libstdc++: Make ranges::distance work with volatile iterators (LWG 4242)

2026-03-16 22:04:23 +00:00

Update copyright years.

2026-01-02 09:56:11 +01:00

c_compatibility

Update copyright years.

2026-01-02 09:56:11 +01:00