# Standard library header <experimental/ranges/range>

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This header is part of the ranges library.

### Range concepts

Defined in namespace `std::experimental::ranges`
Range | specifies that a type is a range, that is, it provides a `begin` iterator and an `end` sentinel (concept)
SizedRange | specifies that a range knows its size in constant time (concept)
View | specifies that a range is a view, that is, it has constant time copy/move/assignment (concept)
BoundedRange | specifies that a range has identical iterator and sentinel types (concept)
InputRange | specifies a range whose iterator type satisfies `InputIterator` (concept)
OutputRange | specifies a range whose iterator type satisfies `OutputIterator` (concept)
ForwardRange | specifies a range whose iterator type satisfies `ForwardIterator` (concept)
BidirectionalRange | specifies a range whose iterator type satisfies `BidirectionalIterator` (concept)
RandomAccessRange | specifies a range whose iterator type satisfies `RandomAccessIterator` (concept)

### Range access

Defined in namespace `std::experimental::ranges`
begincbegin | returns an iterator to the beginning of a range (customization point object)
endcend | returns an iterator to the end of a range (customization point object)
rbegincrbegin | returns a reverse iterator to a range (customization point object)
rendcrend | returns a reverse end iterator to a range (customization point object)

### Range primitives

Defined in namespace `std::experimental::ranges`
size | obtains the size of a range whose size can be calculated in constant time (customization point object)
empty | checks whether a range is empty (customization point object)
datacdata | obtains a pointer to the beginning of a contiguous range (customization point object)
iterator_tsentinel_t | obtains the iterator and sentinel types of a range (alias template)

### Synopsis

    #include <experimental/ranges/iterator>

    namespace std { namespace experimental { namespace ranges { inline namespace v1 {

    namespace {
      constexpr /* unspecified */ begin = /* unspecified */;
      constexpr /* unspecified */ end = /* unspecified */;
      constexpr /* unspecified */ cbegin = /* unspecified */;
      constexpr /* unspecified */ cend = /* unspecified */;
      constexpr /* unspecified */ rbegin = /* unspecified */;
      constexpr /* unspecified */ rend = /* unspecified */;
      constexpr /* unspecified */ crbegin = /* unspecified */;
      constexpr /* unspecified */ crend = /* unspecified */;
    }

    namespace {
      constexpr /* unspecified */ size = /* unspecified */;
      constexpr /* unspecified */ empty = /* unspecified */;
      constexpr /* unspecified */ data = /* unspecified */;
      constexpr /* unspecified */ cdata = /* unspecified */;
    }

    template <class T>
    using iterator_t = decltype(ranges::begin(declval<T&>()));

    template <class T>
    using sentinel_t = decltype(ranges::end(declval<T&>()));

    template <class>
    constexpr bool disable_sized_range = false;

    template <class T>
    struct enable_view { };

    struct view_base { };

    template <class T>
    concept bool Range = /* see definition */;

    template <class T>
    concept bool SizedRange = /* see definition */;

    template <class T>
    concept bool View = /* see definition */;

    template <class T>
    concept bool BoundedRange = /* see definition */;

    template <class T>
    concept bool InputRange = /* see definition */;

    template <class R, class T>
    concept bool OutputRange = /* see definition */;

    template <class T>
    concept bool ForwardRange = /* see definition */;

    template <class T>
    concept bool BidirectionalRange = /* see definition */;

    template <class T>
    concept bool RandomAccessRange = /* see definition */;

    }}}}

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