Defined in header
basic_istream& putback( char_type ch );
protected: virtual int_type underflow();
std::basic_string<CharT,Traits,Allocator> str() const; (1)
protected: virtual int_type uflow()
int_type sputc( char_type ch );
template< class CharT, class Traits > void swap( basic_fstream<CharT
std::locale imbue( const std::locale& loc );
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