add SWAP macro

2014-04-01 11:39:35 +09:00 · 2014-04-01 11:39:35 +09:00 · 2643cb0e3c
parent cbcbd9e6c4
commit 2643cb0e3c
1 changed files with 9 additions and 0 deletions
--- a/include/picrin/util.h
+++ b/include/picrin/util.h
@ -35,6 +35,15 @@ extern "C" {
 # define UNREACHABLE() (assert(false))
 #endif

+#define SWAP(type,a,b)                          \
+  SWAP_HELPER__(type,GENSYM(tmp),a,b)
+#define SWAP_HELPER__(type,tmp,a,b)             \
+  do {                                          \
+    type tmp = (a);                             \
+    (a) = (b);                                  \
+    (b) = tmp;                                  \
+  } while (0)
+
 #if defined(__cplusplus)
 }
 #endif