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std::experi...or_category(3) C++ Standard Libary std::experi...or_category(3) NAME std::experimental::ranges::iterator_category - std::experimen- tal::ranges::iterator_category Synopsis Defined in header <experimental/ranges/iterator> template< class I > (1) struct iterator_category { }; template< class T > (2) struct iterator_category<T*>; template< class T > (3) struct iterator_category<const T> : iterator_category<T> { }; template <class T> requires requires { typename T::iterator_category; } (4) struct iterator_category<T>; Computes the iterator category of the class I, if any. Users may specialize iterator_category 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 ranges::random_access_iterator_tag. Otherwise, there is no member type. 3) Specialization for const-qualified types. 4) Specialization for types that define a public and accessible mem- ber type iterator_category. If T::iterator_category is the same as or derived from one of iterator category tags in namespace std, it is mapped to the corre- sponding tag in the namespace ranges as described below. Otherwise, provides a mem- ber type type equal to T::iterator_category. * If T::iterator_category is the same as or derives from std::random_access_iterator_tag, provides a member type type equal to ranges::random_access_iterator_tag. * Otherwise, if T::iterator_category is the same as or derives from std::bidirectional_iterator_tag, provides a member type type equal to ranges::bidirectional_iterator_tag. * Otherwise, if T::iterator_category is the same as or derives from std::forward_iterator_tag, provides a member type type equal to ranges::forward_iterator_tag. * Otherwise, if T::iterator_category is the same as or derives from std::input_iterator_tag, provides a member type type equal to ranges::input_iterator_tag. * Otherwise, if T::iterator_category is the same as or derives from std::output_iterator_tag, there is no member type. Helper alias template template< class T > using iterator_category_t = typename (ranges TS) ranges::iterator_category<T>::type; Example This section is incomplete Reason: no example See also input_iterator_tag output_iterator_tag forward_iterator_tag empty class types used to indicate itera- tor categories bidirectional_iterator_tag (class) random_access_iterator_tag contiguous_iterator_tag (C++20) input_iterator_tag output_iterator_tag empty class types used to indicate itera- tor categories forward_iterator_tag (class) bidirectional_iterator_tag random_access_iterator_tag compatibility traits class that collects an iterators iterator_traits associated types (alias template) http://cppreference.com 2022.07.31 std::experi...or_category(3)
NAME | Synopsis | Example | See also
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