std::istream_iterator<T,CharT,Traits,Distance>::operator*, operator->
From cppreference.com
const T& operator*() const;
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const T* operator->() const;
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Returns a pointer or a reference to the current element.
The behavior is undefined if the iterator is end-of-stream iterator.
Parameters
(none)
Return value
A pointer or a reference to the current element.
Exceptions
May throw implementation-defined exceptions.