tmp/tmpfjv43r98/{from.md → to.md}
RENAMED
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| 1 |
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#### General <a id="istreambuf.iterator.general">[[istreambuf.iterator.general]]</a>
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The class template `istreambuf_iterator` defines an input iterator
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[[input.iterators]] that reads successive *characters* from the
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streambuf for which it was constructed. `operator*` provides access to
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the current input character, if any. Each time `operator++` is
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evaluated, the iterator advances to the next input character. If the end
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of stream is reached (`streambuf_type::sgetc()` returns
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`traits::eof()`), the iterator becomes equal to the *end-of-stream*
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iterator value. The default constructor `istreambuf_iterator()` and the
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constructor `istreambuf_iterator(nullptr)` both construct an
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end-of-stream iterator object suitable for use as an end-of-range. All
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specializations of `istreambuf_iterator` shall have a trivial copy
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constructor, a `constexpr` default constructor, and a trivial
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destructor.
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The result of `operator*()` on an end-of-stream iterator is undefined.
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For any other iterator value a `char_type` value is returned. It is
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impossible to assign a character via an input iterator.
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``` cpp
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namespace std {
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template<class charT, class traits = char_traits<charT>>
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class istreambuf_iterator {
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public:
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using iterator_category = input_iterator_tag;
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using value_type = charT;
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using difference_type = typename traits::off_type;
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using pointer = unspecified;
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using reference = charT;
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using char_type = charT;
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using traits_type = traits;
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using int_type = typename traits::int_type;
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using streambuf_type = basic_streambuf<charT,traits>;
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using istream_type = basic_istream<charT,traits>;
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// [istreambuf.iterator.proxy], class istreambuf_iterator::proxy
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class proxy; // exposition only
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constexpr istreambuf_iterator() noexcept;
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constexpr istreambuf_iterator(default_sentinel_t) noexcept;
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istreambuf_iterator(const istreambuf_iterator&) noexcept = default;
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~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++();
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proxy operator++(int);
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bool equal(const istreambuf_iterator& b) const;
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friend bool operator==(const istreambuf_iterator& i, default_sentinel_t s);
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private:
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streambuf_type* sbuf_; // exposition only
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};
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}
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```
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