[ostringstream.swap]

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void swap(basic_ostringstream& rhs);

Effects: Equivalent to: basic_ostream<charT, traits>::swap(rhs); sb.swap(rhs.sb);

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template<class charT, class traits, class Allocator>
  void swap(basic_ostringstream<charT, traits, Allocator>& x,
            basic_ostringstream<charT, traits, Allocator>& y);

Effects: Equivalent to x.swap(y).

31 Input/output library [input.output]

31.8 String-based streams [string.streams]

31.8.4 Class template basic_ostringstream [ostringstream]

31.8.4.3 Swap [ostringstream.swap]