23 Ranges library [ranges]

23.5 Range utilities [range.utility]

23.5.1 Helper concepts [range.utility.helpers]

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Many of the types in this subclause are specified in terms of the following exposition-only concepts:
template<class R>
  concept simple-view =                         // exposition only
    View<R> && Range<const R> &&
    Same<iterator_t<R>, iterator_t<const R>> &&
    Same<sentinel_t<R>, sentinel_t<const R>>;

template<InputIterator I>
  concept has-arrow =                           // exposition only
    is_pointer_v<I> || requires(I i) { i.operator->(); };

template<class T, class U>
  concept not-same-as =                         // exposition only
    !Same<remove_cvref_t<T>, remove_cvref_t<U>>;