basic_istream::seekg

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basic_istream::seekg

basic_istream& seekg(pos_type pos);
basic_istream& seekg(off_type off, ios_base::seek_dir way);

If fail() is false, the first member function calls rdbuf()-> pubseekpos(pos). If fail() is false, the second function calls rdbuf()-> pubseekoff(off, way). Both functions return *this.