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std::ranges::bidirectional_range

From cppreference.com
< cpp‎ | ranges
 
 
 
Defined in header <ranges>
template<class T>

  concept bidirectional_range =

    ranges::forward_range<T> && std::bidirectional_iterator<ranges::iterator_t<T>>;

The bidirectional_range concept is a refinement of range for which ranges::begin returns a model of bidirectional_iterator.