24 Ranges library [ranges]

24.6 Range factories [range.factories]

24.6.5 Istream view [range.istream]

24.6.5.3 Class template basic_­istream_­view​::​iterator [range.istream.iterator]

namespace std::ranges { template<movable Val, class CharT, class Traits> requires default_initializable<Val> && stream-extractable<Val, CharT, Traits> class basic_istream_view<Val, CharT, Traits>::iterator { // exposition only public: using iterator_concept = input_iterator_tag; using difference_type = ptrdiff_t; using value_type = Val; iterator() = default; constexpr explicit iterator(basic_istream_view& parent) noexcept; iterator(const iterator&) = delete; iterator(iterator&&) = default; iterator& operator=(const iterator&) = delete; iterator& operator=(iterator&&) = default; iterator& operator++(); void operator++(int); Val& operator*() const; friend bool operator==(const iterator& x, default_sentinel_t); private: basic_istream_view* parent_ = nullptr; // exposition only }; }
constexpr explicit iterator(basic_istream_view& parent) noexcept;
Effects: Initializes parent_­ with addressof(parent).
iterator& operator++();
Preconditions: parent_­->stream_­ != nullptr is true.
Effects: Equivalent to: *parent_->stream_ >> parent_->value_; return *this;
void operator++(int);
Preconditions: parent_­->stream_­ != nullptr is true.
Effects: Equivalent to ++*this.
Val& operator*() const;
Preconditions: parent_­->stream_­ != nullptr is true.
Effects: Equivalent to: return parent_­->value_­;
friend bool operator==(const iterator& x, default_sentinel_t);
Effects: Equivalent to: return x.parent_­ == nullptr || !*x.parent_­->stream_­;