From 250c28ccdef5f238677b34f21ec7fab06588a127 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Thu, 28 Jul 2011 21:34:45 -0600
Subject: Make the checker pattern a singleton.

---
 libdimension/dimension/refcount.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'libdimension/dimension/refcount.h')

diff --git a/libdimension/dimension/refcount.h b/libdimension/dimension/refcount.h
index 5ffde4c..a0f5b6e 100644
--- a/libdimension/dimension/refcount.h
+++ b/libdimension/dimension/refcount.h
@@ -32,7 +32,14 @@ typedef unsigned int dmnsn_refcount;
  * Increment a reference count.
  * @param[in,out] object  The reference-counted object to acquire.
  */
-#define DMNSN_INCREF(object) ((void)((object) && ++(object)->refcount))
+#define DMNSN_INCREF(object)                                            \
+  do {                                                                  \
+    /* Suppress "address will always evaluate to true" warning */       \
+    void *testptr = (object);                                           \
+    if (testptr) {                                                      \
+      ++(object)->refcount;                                             \
+    }                                                                   \
+  } while (0)
 
 /**
  * @internal
-- 
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