template<typenameIterator>struct iterator_traits { typedef typename Iterator::iterator_category iterator_category; typedef typename Iterator::value_type value_typep; typedef typename Iterator::difference_type difference_type; typedef typename Iterator::pointer pointer; typedef typename Iterator::reference refer...
//使用iterator提供的信息template<typenameIterator>structiterator_traits{typedeftypenameIterator::iterator_category iterator_category;typedeftypenameIterator::value_type value_typep;typedeftypenameIterator::difference_type difference_type;typedeftypenameIterator::pointer pointer;typedeftypenameIterator::reference referenc...
1template<class..._Ty>2usingvoid_t =void;34template <class,class=void>5struct_Iterator_traits_base {};//empty for non-iterators67template <class_Iter>8struct_Iterator_traits_base<_Iter,9void_t<typename _Iter::iterator_category, typename _Iter::value_type, typename _Iter::difference_type,...
typename=__void_t<>>struct__iterator_traits{};template<typename_Iterator>struct__iterator_traits<_Iterator,__void_t<typename_Iterator::iterator_category,typename_Iterator::value_type,typename_Iterator::difference_type,typename
错误:使用 Boost 的 iterator_facade 时,“std::iterator_traits”中没有名为“value_type”的类型问题描述 投票:0回答:1我正在使用 Boost 1.84 和 C++17,并且创建了一个继承自 boost::iterator_facade 的 polymorphic_iterator 类。这是我的课程的简化版本:...
value_typevoid pointervoid referencevoid iterator_categorystd::output_iterator_tag Otherwise, this template has no members by any of those names (std::iterator_traitsis SFINAE-friendly). (since C++20) Specializations This type trait may be specialized for user-provided types that may be used as...
Iterator difference_type std::iterator_traits<Iterator>::difference_type pointer Iterator value_type std::iterator_traits<Iterator>::value_type iterator_category std::iterator_traits<Iterator>::iterator_category reference value_type&& (until C++17) If std::iterator_traits<Iterator>::reference is a ...
class reverse_iterator : public std::iterator< typename std::iterator_traits<Iter>::iterator_category, typename std::iterator_traits<Iter>::value_type, typename std::iterator_traits<Iter>::difference_type, typename std::iterator_traits<Iter>::pointer, typename std::iterator_traits<Iter>::referen...
typename iterator_traits<_RandomAccessIterator>::value_type, typename iterator_traits<_RandomAccessIterator>::value_type>) __glibcxx_requires_valid_range(__first, __last); std::__sort(__first, __last, __gnu_cxx::__ops::__iter_comp_iter(__comp)); ...
value_typestd::iter_value_t<Iter> difference_typestd::iter_difference_t<Iter> pointerstd::iterator_traits<Iter>::pointer referencestd::iter_reference_t<Iter> (C++20 起) ↑1.01.1在 C++17 前,此定义由作为基的std::iterator特化提供。