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/*
 * Swaps two values and requires
 * requires tmp variable to be defined.
 */
#define SWAP(x, y) \
  tmp = x; \
  x = y; \
  y = tmp

/*
 * Swaps two values and requires
 * requires tmp variable to be defined.
 */
#define SWAP(x,y) { tmp = x; x = y; y = tmp; }

/*
 * Swaps two values and requires
 * requires tmp variable to be defined.
 */
#define SWAP(x, y) \
  do { \
    tmp = x; \
    x = y; \
    y = tmp; } \
  while (0)