[istreambuf.iterator.ops]

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charT operator*() const;

Returns: The character obtained via the streambuf member sbuf_->sgetc().

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istreambuf_iterator& operator+();

Returns: *this.

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proxy operator+(int);

Returns: proxy(sbuf_->sbumpc(), sbuf_).

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bool equal(const istreambuf_iterator& b) const;

Returns: true if and only if both iterators are at end-of-stream, or neither is at end-of-stream, regardless of what streambuf object they use.

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template<class charT, class traits>
  bool operator=(const istreambuf_iterator<charT,traits>& a,
                  const istreambuf_iterator<charT,traits>& b);

Returns: a.equal(b).

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friend bool operator=(const istreambuf_iterator& i, default_sentinel_t s);

Returns: i.equal(s).

24 Iterators library [iterators]

24.6 Stream iterators [stream.iterators]

24.6.4 Class template istreambuf_iterator [istreambuf.iterator]

24.6.4.4 Operations [istreambuf.iterator.ops]