23 Iterators library [iterators]

23.6 Stream iterators [stream.iterators]

23.6.2 Class template istream_­iterator [istream.iterator]

23.6.2.2 Constructors and destructor [istream.iterator.cons]

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constexpr istream_iterator(); constexpr istream_iterator(default_sentinel_t);
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Effects: Constructs the end-of-stream iterator, value-initializing value.
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Postconditions: in_­stream == nullptr is true.
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Remarks: If the initializer T() in the declaration auto x = T(); is a constant initializer ([expr.const]), then these constructors are constexpr constructors.
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istream_iterator(istream_type& s);
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Effects: Initializes in_­stream with addressof(s), value-initializes value, and then calls operator++().
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istream_iterator(const istream_iterator& x) = default;
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Postconditions: in_­stream == x.in_­stream is true.
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Remarks: If is_­trivially_­copy_­constructible_­v<T> is true, then this constructor is trivial.
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~istream_iterator() = default;
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Remarks: If is_­trivially_­destructible_­v<T> is true, then this destructor is trivial.