[range.istream.iterator]

# 25 Ranges library [[ranges]](./#ranges)

## 25.6 Range factories [[range.factories]](range.factories#range.istream.iterator)

### 25.6.6 Istream view [[range.istream]](range.istream#iterator)

#### 25.6.6.3 Class basic_istream_view​::​*iterator* [range.istream.iterator]

[🔗](#lib:basic_istream_view::iterator)

namespace std::ranges {template<[movable](concepts.object#concept:movable "18.6 Object concepts [concepts.object]") Val, class CharT, class Traits>requires [default_initializable](concept.default.init#concept:default_initializable "18.4.12 Concept default_­initializable [concept.default.init]")<Val> &&[*stream-extractable*](range.istream.view#concept:stream-extractable "25.6.6.2 Class template basic_­istream_­view [range.istream.view]")<Val, CharT, Traits>class basic_istream_view<Val, CharT, Traits>::*iterator* {public:using iterator_concept = input_iterator_tag; using difference_type = ptrdiff_t; using value_type = Val; 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_*; // *exposition only*};}

[🔗](#lib:basic_istream_view::iterator,constructor)

`constexpr explicit iterator(basic_istream_view& parent) noexcept;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L4120)

*Effects*: Initializes *parent_* with addressof(parent)[.](#1.sentence-1)

[🔗](#lib:operator++,basic_istream_view::iterator)

`iterator& operator++();
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L4131)

*Effects*: Equivalent to:**parent_*->*stream_* >> *parent_*->*value_*;return *this;

[🔗](#lib:operator++,basic_istream_view::iterator_)

`void operator++(int);
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L4146)

*Effects*: Equivalent to ++*this[.](#3.sentence-1)

[🔗](#lib:operator*,basic_istream_view::iterator)

`Val& operator*() const;
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L4157)

*Effects*: Equivalent to: return *parent_*->*value_*;

[🔗](#lib:operator==,basic_istream_view::iterator)

`friend bool operator==(const iterator& x, default_sentinel_t);
`

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L4168)

*Effects*: Equivalent to: return !*x.*parent_*->*stream_*;