Defined in header <ranges>  |  ||
|---|---|---|
 template<class T>
  concept BidirectionalRange =
    ForwardRange<T> && BidirectionalIterator<iterator_t<T>>;
 |  
The BidirectionalRange concept is a refinement of Range for which ranges::begin returns a model of BidirectionalIterator.
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    http://en.cppreference.com/w/cpp/ranges/BidirectionalRange