istream& seekg( streampos pos );
istream& seekg( streamoff off, ios::seek_dir dir );
The new position value; streampos is a typedef equivalent to long.
The new offset value; streamoff is a typedef equivalent to long.
The seek direction. Must be one of the following enumerators:
- ios::beg Seek from the beginning of the stream.
- ios::cur Seek from the current position in the stream.
- ios::end Seek from the end of the stream.
Changes the get pointer for the stream. Not all derived classes of istream need support positioning; it is most often used with file-based streams.