From e59b4587b706bb91b7875b4675cfdcdf68ae493c Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Thu, 19 Mar 2009 21:43:27 +0000
Subject: COMMON: Added a new IS_ALIGNED macro (for now using size_t, we can
 change it if this turns out to be not portable enough. Also added a doxygen
 comment to the ARRAYSIZE macro

svn-id: r39542
---
 common/util.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'common/util.h')

diff --git a/common/util.h b/common/util.h
index 18f1b70c52..3b2a705d6c 100644
--- a/common/util.h
+++ b/common/util.h
@@ -28,6 +28,15 @@
 #include "common/scummsys.h"
 #include "common/str.h"
 
+
+/**
+ * Check whether a given pointer is aligned correctly.
+ * Note that 'alignment' must be a power of two!
+ */
+#define IS_ALIGNED(value, alignment) \
+          ((((size_t)value) & ((alignment) - 1)) == 0)
+
+
 #ifdef MIN
 #undef MIN
 #endif
@@ -47,6 +56,9 @@ template<typename T> inline T CLIP (T v, T amin, T amax)
  */
 template<typename T> inline void SWAP(T &a, T &b) { T tmp = a; a = b; b = tmp; }
 
+/**
+ * Macro which determines the number of entries in a fixed size array.
+ */
 #define ARRAYSIZE(x) ((int)(sizeof(x) / sizeof(x[0])))
 
 
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