std::ostream_iterator<T,CharT,Traits>::operator*
From cppreference.com
ostream_iterator& operator*();
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Does nothing, this member function is provided to satisfy the requirements of LegacyOutputIterator.
It returns the iterator itself, which makes it possible to use code such as *iter = value to output (insert) the value into the underlying stream.
Parameters
(none)
Return value
*this