ostream_iterator(ostream_type& s);
Effects: Initializes out_stream with &s and delim with null.
ostream_iterator(ostream_type& s, const charT* delimiter);
Effects: Initializes out_stream with &s and delim with delimiter.
ostream_iterator(const ostream_iterator& x);
Effects: Constructs a copy of x.
Effects: The iterator is destroyed.