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std::ranges::bidirectional_range

Defined in header <ranges>
template< class T >
  concept bidirectional_range =
    ranges::forward_range<T> && std::bidirectional_iterator<ranges::iterator_t<T>>;
(since C++20)

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

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