char_type* eback() const;
Returns:
The beginning pointer for the input sequence.
char_type* gptr() const;
Returns:
The next pointer for the input sequence.
char_type* egptr() const;
Returns:
The end pointer for the input sequence.
void gbump(int n);
Effects:
Adds n to the next pointer for the input sequence.
void setg(char_type* gbeg, char_type* gnext, char_type* gend);
Postconditions:
gbeg == eback(),
gnext == gptr(),
and
gend == egptr().