Compilare: user.cpp: In member function ‘bool Point::operator<(const Point&) const’: user.cpp:12:57: warning: second operand of conditional expression has no effect [-Wunused-value] bool operator <(const Point &o) const { (x == o.x ? y < o.y : x < o.x); } ^ user.cpp:12:67: warning: third operand of conditional expression has no effect [-Wunused-value] bool operator <(const Point &o) const { (x == o.x ? y < o.y : x < o.x); } ^ user.cpp:12:75: warning: no return statement in function returning non-void [-Wreturn-type] bool operator <(const Point &o) const { (x == o.x ? y < o.y : x < o.x); } ^