Defined in header
int pcount() const;
static bool sync_with_stdio( bool sync = true );
strstreambuf* rdbuf() const;
std::basic_filebuf<CharT, Traits>* open( const char* s, std::ios_base::openmode
void swap( basic_ostringstream& other );
basic_ostream& write( const char_type* s, std::streamsize
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