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Implement LWG-4253 basic_const_iterator should provide iterator_type #5868

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Merged
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Nov 19, 2025
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Implement LWG-4253 basic_const_iterator should provide iterator_type #5868

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1 change: 1 addition & 0 deletions stl/inc/xutility
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Original file line number Diff line number Diff line change
Expand Up @@ -2377,6 +2377,7 @@ private:
}

public:
using iterator_type = _Iter;
using iterator_concept = decltype(_Get_iter_concept());
using value_type = iter_value_t<_Iter>;
using difference_type = iter_difference_t<_Iter>;
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1 change: 1 addition & 0 deletions tests/std/tests/P2278R4_basic_const_iterator/test.cpp
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Expand Up @@ -38,6 +38,7 @@ constexpr void test_one(It iter) {
static_assert(contiguous_iterator<ConstIt> == contiguous_iterator<It>);

// Validate nested types
static_assert(same_as<typename ConstIt::iterator_type, It>);
static_assert(same_as<typename ConstIt::value_type, iter_value_t<It>>);
static_assert(same_as<typename ConstIt::difference_type, iter_difference_t<It>>);
if constexpr (forward_iterator<It>) {
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