contrib/coccinelle/swap.cocci

   1 @ swap_with_declaration @
   2 type T;
   3 identifier tmp;
   4 T a, b;
   5 @@
   6 - T tmp = a;
   7 + T tmp;
   8 + tmp = a;
   9   a = b;
  10   b = tmp;
  11
  12 @ swap @
  13 type T;
  14 T tmp, a, b;
  15 @@
  16 - tmp = a;
  17 - a = b;
  18 - b = tmp;
  19 + SWAP(a, b);
  20
  21 @ extends swap @
  22 identifier unused;
  23 @@
  24   {
  25   ...
  26 - T unused;
  27   ... when != unused
  28   }