23 Iterators library [iterators]

23.6 Stream iterators [stream.iterators]

23.6.4 Class template istreambuf_­iterator [istreambuf.iterator]

23.6.4.3 Constructors [istreambuf.iterator.cons]

1
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For each istreambuf_­iterator constructor in this subclause, an end-of-stream iterator is constructed if and only if the exposition-only member sbuf_­ is initialized with a null pointer value.
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constexpr istreambuf_iterator() noexcept; constexpr istreambuf_iterator(default_sentinel_t) noexcept;
2
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Effects: Initializes sbuf_­ with nullptr.
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istreambuf_iterator(istream_type& s) noexcept;
3
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Effects: Initializes sbuf_­ with s.rdbuf().
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istreambuf_iterator(streambuf_type* s) noexcept;
4
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Effects: Initializes sbuf_­ with s.
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istreambuf_iterator(const proxy& p) noexcept;
5
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Effects: Initializes sbuf_­ with p.sbuf_­.