std::ranges::viewable_range(3) Library Functions Manual std::ranges::viewable_range(3)

std::ranges::viewable_range - A range which can be safely converted to a view.

#include <ranges_base.h>

template<typename _Tp>
concept std::ranges::viewable_range =  range<_Tp>
      && ((view<remove_cvref_t<_Tp>> && constructible_from<remove_cvref_t<_Tp>, _Tp>)
          || (!view<remove_cvref_t<_Tp>>
              && (is_lvalue_reference_v<_Tp>
                  || (movable<remove_reference_t<_Tp>>
                      && !__detail::__is_initializer_list<remove_cvref_t<_Tp>>))))

A range which can be safely converted to a view.

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