std::experimental::ranges::value_type

Header: <experimental/ranges/iterator>

Computes the associated value type of the type I, if any. Users may specialize value_type for a program-defined type.

# Declarations

template< class I >
struct value_type {};

template< class T >
struct value_type<T*>;

template< class I >
requires std::is_array<I>::value
struct value_type<I> : value_type<std::decay_t<I>> {};

template< class T >
struct value_type<const T> : value_type<std::decay_t<T>> {};

template< class T >
requires requires { typename T::value_type; }
struct value_type<T>;

template< class T >
requires requires { typename T::element_type; }
struct value_type<T>;

# 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 incompleteReason: no example

# See also

• Readable