1 files changed, 7 insertions, 0 deletions
diff --git a/common.h b/common.h
index 0c644bd..e502853 100644
--- a/common.h
+++ b/common.h
@@ -24,6 +24,13 @@
 #define MIN(x, y) ((x) > (y) ? (y) : (x))
 #define ARRAY_ELEMS(arr) (sizeof(arr) / sizeof(*arr))
 
+#define SWAP(x, y, type)            \
+do {                                \
+    type tmp = x;                   \
+    x = y;                          \
+    y = tmp;                        \
+} while (0)
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>