[istream.iterator.general] (original) (raw)

The class template istream_iteratoris an input iterator ([input.iterators]) that reads successive elements from the input stream for which it was constructed.

namespace std { template<class T, class charT = char, class traits = char_traits<charT>,class Distance = ptrdiff_t> class istream_iterator { public: using iterator_category = input_iterator_tag;using value_type = T;using difference_type = Distance;using pointer = const T*;using reference = const T&;using char_type = charT;using traits_type = traits;using istream_type = basic_istream<charT,traits>;constexpr istream_iterator();constexpr istream_iterator(default_sentinel_t); istream_iterator(istream_type& s);constexpr istream_iterator(const istream_iterator& x) noexcept(see below);~istream_iterator() = default; istream_iterator& operator=(const istream_iterator&) = default;const T& operator*() const;const T* operator->() const; istream_iterator& operator++(); istream_iterator operator++(int);friend bool operator==(const istream_iterator& i, default_sentinel_t);private: basic_istream<charT,traits>* in_stream; T value; };}

The type T shall meet the Cpp17DefaultConstructible,Cpp17CopyConstructible, and Cpp17CopyAssignable requirements.