macro: add swap helper

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

macro: add swap helper
a38a34f8 · Christian Brauner · 79bc22bd · a38a34f8
Unverified Commit a38a34f8 authored Feb 18, 2021 by Christian Brauner
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macro.h src/lxc/macro.h +7 -0

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--- a/src/lxc/macro.h
+++ b/src/lxc/macro.h
@@ -694,4 +694,11 @@ enum {

 #define MAX_FILENO ~0U

+#define swap(a, b)                     \
+	do {                           \
+		typeof(a) __tmp = (a); \
+		(a) = (b);             \
+		(b) = __tmp;           \
+	} while (0)
+
 #endif /* __LXC_MACRO_H */