View Compilation Error

0_0_17424400_26079.cpp: In function 'void graham(int, Point*)':
0_0_17424400_26079.cpp:6:31: error: 'typeof' was not declared in this scope
 #define swap(a, b) do{typeof(a)_t = (a); (a) = (b); (b) = _t;}while(0)
                               ^
0_0_17424400_26079.cpp:59:3: note: in expansion of macro 'swap'
   swap(list[k], list[0]);
   ^
0_0_17424400_26079.cpp:6:59: error: '_t' was not declared in this scope
 #define swap(a, b) do{typeof(a)_t = (a); (a) = (b); (b) = _t;}while(0)
                                                           ^
0_0_17424400_26079.cpp:59:3: note: in expansion of macro 'swap'
   swap(list[k], list[0]);
   ^