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