View Compilation Error

0_0_35111798_26034.cpp: In member function 'void heap::pop()':
0_0_35111798_26034.cpp:29:20: error: expression cannot be used as a function
  #define rs (x<<1|1)
                    ^
0_0_35111798_26034.cpp:45:49: note: in expansion of macro 'rs'
          son=(rs<=len && dis[a[rs]]<dis[a[ls]]) rs : ls;
                                                 ^