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<ranges>: Fix C2382 when mixing #include <ranges> with import std; #6436

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<ranges>: Fix C2382 when mixing #include <ranges> with import std; #6436

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13 changes: 11 additions & 2 deletions stl/inc/ranges
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Original file line number Diff line number Diff line change
Expand Up @@ -7140,14 +7140,23 @@ namespace ranges {
return _Get_smallest_distance_closure(index_sequence_for<_LHSTupleTypes...>{});
}

// Work around C2382 when mixing #include <ranges> with import std;: a noexcept fold expression prevents
// the compiler from matching the textual and module declarations, while a variable template is trivially matched.
template <class _LHSTupleType, class _RHSTupleType>
inline constexpr bool _Zip_iterator_sentinel_equal_is_nothrow = false;

template <class... _LHSTupleTypes, class... _RHSTupleTypes>
inline constexpr bool _Zip_iterator_sentinel_equal_is_nothrow<tuple<_LHSTupleTypes...>, tuple<_RHSTupleTypes...>> =
(noexcept(_STD declval<const _LHSTupleTypes&>() == _STD declval<const _RHSTupleTypes&>()) && ...);

template <class... _LHSTupleTypes, class... _RHSTupleTypes>
requires (sizeof...(_LHSTupleTypes) == sizeof...(_RHSTupleTypes))
_NODISCARD constexpr bool _Zip_iterator_sentinel_equal(
const tuple<_LHSTupleTypes...>& _Lhs_tuple, const tuple<_RHSTupleTypes...>& _Rhs_tuple)
noexcept((noexcept(_STD declval<const _LHSTupleTypes&>() == _STD declval<const _RHSTupleTypes&>()) && ...)) {
noexcept(_Zip_iterator_sentinel_equal_is_nothrow<tuple<_LHSTupleTypes...>, tuple<_RHSTupleTypes...>>) {
const auto _Evaluate_equality_closure =
[&_Lhs_tuple, &_Rhs_tuple]<size_t... _Indices>(index_sequence<_Indices...>) noexcept(
(noexcept(_STD declval<const _LHSTupleTypes&>() == _STD declval<const _RHSTupleTypes&>()) &&...)) {
_Zip_iterator_sentinel_equal_is_nothrow<tuple<_LHSTupleTypes...>, tuple<_RHSTupleTypes...>>) {
return ((_STD get<_Indices>(_Lhs_tuple) == _STD get<_Indices>(_Rhs_tuple)) || ... || false);
};

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