/in/foo.cc: In constructor 'data::data(int, int, int, int)':
/in/foo.cc:6:15: warning: 'data::rx' will be initialized after [-Wreorder]
     int lx,ly,rx,ry;
               ^~
/in/foo.cc:6:12: warning:   'int data::ly' [-Wreorder]
     int lx,ly,rx,ry;
            ^~
/in/foo.cc:8:5: warning:   when initialized here [-Wreorder]
     data(int A,int B,int X,int Y):lx(A),rx(A+X),ly(B),ry(B+Y){}
     ^~~~