[libvirt] [PATCH 02/10] internal: Introduce macro for stealing pointers

[Peter Krempa]

VIR_STEAL copies the second argument into the first and then sets it to
NULL. This is useful for stealing pointers.
---
 src/internal.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/internal.h b/src/internal.h
index 0dc34c7..c633ee6 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -307,6 +307,18 @@
     } while (0)

 /**
+ * VIR_STEAL:
+ *
+ * Steals pointer passed as second argument into the first argument. Second
+ * argument must not have side effects.
+ */
+# define VIR_STEAL(a, b)  \
+    do { \
+        (a) = (b); \
+        (b) = NULL;\
+    } while (0)
+
+/**
  * virCheckFlags:
  * @supported: an OR'ed set of supported flags
  * @retval: return value in case unsupported flags were passed
-- 
2.9.2