#
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
#
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
#
Effects: Initializes sbuf_ with s.
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istreambuf_iterator(const proxy& p) noexcept;
5
#
Effects: Initializes sbuf_ with p.sbuf_.

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