# std::ranges::range_reference_t, std::ranges::range_const_reference_t, std::ranges::range_rvalue_reference_t, std::ranges::range_common_reference_t

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< cpp‎ | ranges

Defined in header `<ranges>` |  |
template< ranges::range R > using range_reference_t = std::iter_reference_t < ranges::iterator_t <R>>; | (1) | (since C++20)
template< ranges::range R > using range_const_reference_t = std::iter_const_reference_t < ranges::iterator_t <R>>; | (2) | (since C++23)
template< ranges::range R > using range_rvalue_reference_t = std::iter_rvalue_reference_t < ranges::iterator_t <R>>; | (3) | (since C++20)
template< ranges::range R > using range_common_reference_t = std::iter_common_reference_t < ranges::iterator_t <R>>; | (4) | (since C++20)

1) Used to obtain the reference type of the iterator type of range type `R`.
2) Used to obtain the constant reference type of the iterator type of range type `R`.
3) Used to obtain the rvalue reference type of the iterator type of range type `R`.
4) Used to obtain the common reference type of the iterator type of range type `R`.

### Template parameters

R | - | a `range` type or a `sized_range` type

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 3860 | C++20 | `range_common_reference_t` was missing | added

### See also

iter_value_titer_reference_titer_const_reference_titer_difference_titer_rvalue_reference_titer_common_reference_t (C++20)(C++20)(C++23)(C++20)(C++20)(C++20) | computes the associated types of an iterator (alias template)
ranges::iterator_tranges::const_iterator_tranges::sentinel_tranges::const_sentinel_t (C++20)(C++23)(C++20)(C++23) | obtains iterator and sentinel types of a range (alias template)
ranges::range_difference_tranges::range_size_tranges::range_value_t (C++20)(C++20)(C++20) | obtains size, difference, and value types of a range (alias template)

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