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c351a240ad514199b17b56e1ecff20701d956643
gcc/libstdc++-v3/include/bits
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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
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algorithmfwd.h
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align.h
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alloc_traits.h
libstdc++: Add allocate_at_least (P0401) [PR118030]
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allocated_ptr.h
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allocator.h
libstdc++: Improve diagnostics for std::allocator<incomplete type>
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atomic_base.h
libstdc++: complete P0493R5 with pointer support
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atomic_futex.h
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atomic_timed_wait.h
libstdc++: Fix proxy wait detection in atomic wait
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atomic_wait.h
libstdc++: Add platform wait functions for FreeBSD [PR120527]
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basic_string.h
libstdc++: Use specific feature test macro for #if in <string>
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basic_string.tcc
libstdc++: Implement rvalue overload for basic_string::substr() [PR119745]
2026-02-16 18:26:35 +01:00
binders.h
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chrono_io.h
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cow_string.h
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cpp_type_traits.h
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cpyfunc_impl.h
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erase_if.h
libstdc++: Fix std::erase_if for std::string with -D_GLIBCXX_USE_CXX11_ABI=0.
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formatfwd.h
libstdc++: Implement C++26 P3378R2 - constexpr exception types
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hashtable_policy.h
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hashtable.h
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indirect.h
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memoryfwd.h
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mofunc_impl.h
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new_allocator.h
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ranges_algo.h
libstdc++: Do not use projection for ranges::replace default args (LWG 4444)
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ranges_algobase.h
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ranges_base.h
libstdc++: Make ranges::distance work with volatile iterators (LWG 4242)
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ranges_cmp.h
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regex_executor.h
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regex.h
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regex.tcc
libstdc++: Optimize std::regex_traits lookup functions
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requires_hosted.h
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sat_arith.h
libstdc++: Extend __is_standard_integer to cover extended integer types
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semaphore_base.h
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stl_function.h
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stl_heap.h
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stl_map.h
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stl_multimap.h
libstdc++: container erasure overloads (P2077) [PR117404]
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unordered_set.h
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