Defined in header <iterator> | ||
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template< class T > concept /*dereferenceable*/ = /* see below */; // exposition only | ||
template< class T > using iter_value_t = /* see below */; | (1) | (since C++20) |
template< /*dereferenceable*/ T > using iter_reference_t = decltype(*std::declval<T&>()); | (2) | (since C++20) |
template< class T > using iter_difference_t = /* see below */; | (3) | (since C++20) |
template< /*dereferenceable*/ T>
requires /* see below */
using iter_rvalue_reference_t = decltype(ranges::iter_move(std::declval<T&>()));
| (4) | (since C++20) |
template< Readable T >
using iter_common_reference_t = std::common_reference_t<std::iter_reference_t<T>,
std::iter_value_t<T>&>;
| (5) | (since C++20) |
Compute the associated types of an iterator. The exposition-only concept dereferenceable is satisfied if and only if the expression *std::declval<T&>() is valid and has a referenceable type (in particular, not void).
T. If std::iterator_traits<T> is not specialized, then std::iter_value_t<T> is std::readable_traits<T>::value_type. Otherwise, it is std::iterator_traits<T>::value_type.T.T. If std::iterator_traits<T> is not specialized, then std::iter_difference_t<T> is std::incrementable_traits<T>::difference_type. Otherwise, it is std::iterator_traits<T>::difference_type.T. The "see below" portion of the constraint on this alias template is satisfied if and only if the expression ranges::iter_move(std::declval<T&>()) is valid and has a referenceable type (in particular, not void).T. This is the common reference type between its reference type and an lvalue reference to its value type. specifies that a type is readable by applying operator * (concept) |
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specifies that a Semiregular type can be incremented with pre- and post-increment operators (concept) |
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computes the value type of a Readable type (class template) |
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computes the difference type of a WeaklyIncrementable type (class template) |
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| provides uniform interface to the properties of an iterator (class template) |
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