explicit basic_ostringstream( ios_base::openmode mode = ios_base::out ); (1) explicit basic_ostringstream( const std::basic_string<CharT,Traits,Allocator>& str,
ios_base::openmode mode = ios_base::out ); (2) basic_ostringstream( basic_ostringstream&& other ); (3) (since C++11)
Constructs new string stream.
1) Constructs new underlying string device. The underlying basic_stringbuf object is constructed as basic_stringbuf<Char,Traits,A