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std::ranges::input_range

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

  concept input_range =

    ranges::range<T> && std::input_iterator<ranges::iterator_t<T>>;

The input_range concept is a refinement of range for which ranges::begin returns a model of input_iterator.