52 lines
3.1 KiB
Markdown
52 lines
3.1 KiB
Markdown
[istreambuf.iterator.general]
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# 24 Iterators library [[iterators]](./#iterators)
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## 24.6 Stream iterators [[stream.iterators]](stream.iterators#istreambuf.iterator.general)
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### 24.6.4 Class template istreambuf_iterator [[istreambuf.iterator]](istreambuf.iterator#general)
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#### 24.6.4.1 General [istreambuf.iterator.general]
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L6844)
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The
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class templateistreambuf_iterator defines an [input iterator](input.iterators "24.3.5.3 Input iterators [input.iterators]") that
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reads successive*characters* from the streambuf for which it was constructed[.](#1.sentence-1)
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operator* provides access to the current input character, if any[.](#1.sentence-2)
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Each timeoperator++ is evaluated, the iterator advances to the next input character[.](#1.sentence-3)
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If the end of stream is reached (streambuf_type::sgetc() returnstraits::eof()),
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the iterator becomes equal to the[*end-of-stream*](#def:end-of-stream) iterator value[.](#1.sentence-4)
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The default constructoristreambuf_iterator() and the constructoristreambuf_iterator(nullptr) both construct an end-of-stream iterator object suitable for use
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as an end-of-range[.](#1.sentence-5)
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All specializations of istreambuf_iterator shall have a trivial copy
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constructor, a constexpr default constructor, and a trivial destructor[.](#1.sentence-6)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L6871)
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The result ofoperator*() on an end-of-stream iterator is undefined[.](#2.sentence-1)
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For any other iterator value achar_type value is returned[.](#2.sentence-2)
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It is impossible to assign a character via an input iterator[.](#2.sentence-3)
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[ð](#lib:istreambuf_iterator)
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namespace std {template<class charT, class traits = char_traits<charT>>class istreambuf_iterator {public:using iterator_category = input_iterator_tag; using value_type = charT; using difference_type = typename traits::off_type; using pointer = *unspecified*; using reference = charT; using char_type = charT; using traits_type = traits; using int_type = typename traits::int_type; using streambuf_type = basic_streambuf<charT,traits>; using istream_type = basic_istream<charT,traits>; // [[istreambuf.iterator.proxy]](istreambuf.iterator.proxy "24.6.4.2 Class istreambuf_iterator::proxy"), class istreambuf_iterator::*proxy*class *proxy*; // *exposition only*constexpr istreambuf_iterator() noexcept; constexpr istreambuf_iterator(default_sentinel_t) noexcept;
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istreambuf_iterator(const istreambuf_iterator&) noexcept = default; ~istreambuf_iterator() = default;
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istreambuf_iterator(istream_type& s) noexcept;
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istreambuf_iterator(streambuf_type* s) noexcept;
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istreambuf_iterator(const *proxy*& p) noexcept;
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istreambuf_iterator& operator=(const istreambuf_iterator&) noexcept = default;
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charT operator*() const;
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istreambuf_iterator& operator++(); *proxy* operator++(int); bool equal(const istreambuf_iterator& b) const; friend bool operator==(const istreambuf_iterator& i, default_sentinel_t s); private: streambuf_type* sbuf_; // *exposition only*};}
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