View Compilation Error

0_0_33332654_20760.cpp: In member function 'bool Point::operator<(Point&)':
0_0_33332654_20760.cpp:108:20: error: 'p' was not declared in this scope
   return atan2(y - p.y ,x - p.x) < atan2(o.y - p.y, o.x - p.x); // 极角从小(-pi)到大(pi)排序
                    ^