[istream.iterator.cons]

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constexpr istream_iterator();
constexpr istream_iterator(default_sentinel_t);

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);

Effects: Initializes in_stream with addressof(s), value-initializes value, and then calls operator+().

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constexpr istream_iterator(const istream_iterator& x) noexcept(see below);

Effects: Initializes in_stream with x.in_stream and initializes value with x.value.

Remarks: An invocation of this constructor may be used in a core constant expression if and only if the initialization of value from x.value is a constant subexpression ([defns.const.subexpr]).

The exception specification is equivalent to is_nothrow_copy_constructible_v<T>.

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~istream_iterator() = default;

Remarks: If is_trivially_destructible_v<T> is true, then this destructor is trivial.

24 Iterators library [iterators]

24.6 Stream iterators [stream.iterators]

24.6.2 Class template istream_iterator [istream.iterator]

24.6.2.2 Constructors and destructor [istream.iterator.cons]