std::experimental::ranges::value_type(3)

NAME
std::experimental::ranges::value_type - std::experimental::ranges::value_type

Synopsis
   Defined in header <experimental/ranges/iterator>
   template< class I > (1)
   struct value_type { };
   template< class T > (2)
   struct value_type<T*>;
   template< class I >
   requires std::is_array<I>::value (3)
   struct value_type<I> : value_type<std::decay_t<I>> { };
   template< class T > (4)
   struct value_type<const T> : value_type<std::decay_t<T>> { };
   template <class T>
   requires requires { typename T::value_type; } (5)
   struct value_type<T>;
   template <class T>
   requires requires { typename T::element_type; } (6)
   struct value_type<T>;
   Computes the associated value type of the type I, if any. Users may specialize
   value_type for a program-defined type.
   1) Primary template is an empty struct.
   2) Specialization for pointers. If T is an object type, provides a member type type
   equal to std::remove_cv_t<T>. Otherwise, there is no member type.
   3) Specialization for array types.
   4) Specialization for const-qualified types.
   5) Specialization for types that define a public and accessible member type
   value_type. If T::value_type is an object type, provides a member type type equal to
   T::value_type. Otherwise, there is no member type.
   6) Specialization for types that define a public and accessible member type
   element_type (e.g., std::shared_ptr). If T::element_type is an object type, provides
   a member type type equal to std::remove_cv_t<typename T::element_type>. Otherwise,
   there is no member type.
  Helper alias template
   template< class T > (ranges TS)
   using value_type_t = typename ranges::value_type<T>::type;

Notes
   If a type contains both a value_type member and a element_type member, then the
   specializations (5) and (6) are ambiguous.
   value_type is intended for use with Readable types such as iterators. It is not
   intended for use with ranges.

Example
    This section is incomplete
    Reason: no example

See also
   Readable specifies that a type is readable by applying operator *
                   (concept)
                   compatibility traits class that collects an iterator’s associated
   iterator_traits types
                   (alias template)