26 Ranges library [ranges]

26.4 Range requirements [range.req]

26.4.5 Other range refinements [range.refinements]

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The output_range concept specifies requirements of a range type for which ranges​::​begin returns a model of output_iterator ([iterator.concept.output]).
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template<class R, class T> concept output_range = range<R> && output_iterator<iterator_t<R>, T>; template<class T> concept input_range = range<T> && input_iterator<iterator_t<T>>; template<class T> concept forward_range = input_range<T> && forward_iterator<iterator_t<T>>; template<class T> concept bidirectional_range = forward_range<T> && bidirectional_iterator<iterator_t<T>>; template<class T> concept random_access_range = bidirectional_range<T> && random_access_iterator<iterator_t<T>>;
2
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contiguous_range additionally requires that the ranges​::​data customization point object ([range.prim.data]) is usable with the range.
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template<class T> concept contiguous_range = random_access_range<T> && contiguous_iterator<iterator_t<T>> && requires(T& t) { { ranges::data(t) } -> same_as<add_pointer_t<range_reference_t<T>>>; };
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Given an expression t such that decltype((t)) is T&, T models contiguous_range only if to_address(​ranges​::​begin(t)) == ranges​::​data(t) is true.
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The common_range concept specifies requirements of a range type for which ranges​::​begin and ranges​::​end return objects of the same type.
[Example 1: 
The standard containers ([containers]) model common_range.
— end example]
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template<class T> concept common_range = range<T> && same_as<iterator_t<T>, sentinel_t<T>>;
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template<class R> constexpr bool is-initializer-list = see below; // exposition only
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For a type R, is-initializer-list<R> is true if and only if remove_cvref_t<R> is a specialization of initializer_list.
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The viewable_range concept specifies the requirements of a range type that can be converted to a view safely.
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template<class T> concept viewable_range = range<T> && ((view<remove_cvref_t<T>> && constructible_from<remove_cvref_t<T>, T>) || (!view<remove_cvref_t<T>> && (is_lvalue_reference_v<T> || (movable<remove_reference_t<T>> && !is-initializer-list<T>))));
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The constant_range concept specifies the requirements of a range type whose elements are not modifiable.
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template<class T> concept constant_range = input_range<T> && constant-iterator<iterator_t<T>>;