std::experimental::ranges::reference_t, std::experimental::ranges::rvalue_reference_t, std::experimental::ranges::iter_common_reference_t

< cpp‎ | experimental‎ | ranges
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Special mathematical functions (special math TR)
Iterators library
Iterator concepts
Indirect callable concepts
Common algorithm requirements
Concept utilities
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Stream iterators
template <class T>
concept bool /*dereferenceable*/ = requires(T& t) { {*t} -> auto&&; };  // exposition only
template< /*dereferenceable*/ T >
using reference_t = decltype(*declval<T&>());
(1) (ranges TS)
template< /*dereferenceable*/ T >

  requires requires(T& t) { { ranges::iter_move(t) } -> auto&&; }

using rvalue_reference_t = decltype(ranges::iter_move(declval<T&>()));
(2) (ranges TS)
template< Readable T >

using iter_common_reference_t = ranges::common_reference_t<ranges::reference_t<T>,

(3) (ranges TS)
1) Obtain the reference type of a dereferenceable type T.
2) Obtain the rvalue reference type of a dereferenceable type T, that is, the return type of ranges::iter_move.
3) Compute a Readable type's common reference type. This is the common reference type of its reference type and an lvalue reference to its value type.


The -> auto&& constraint checks that the type of the expression is not void.