[Assorted-commits] SF.net SVN: assorted: [247] sandbox/trunk/src/c/bitfields.c

[<yan...@us...>]

Revision: 247
          http://assorted.svn.sourceforge.net/assorted/?rev=247&view=rev
Author:   yangzhang
Date:     2008-01-19 16:27:16 -0800 (Sat, 19 Jan 2008)

Log Message:
-----------
bitfields

Added Paths:
-----------
    sandbox/trunk/src/c/bitfields.c

Added: sandbox/trunk/src/c/bitfields.c
===================================================================
--- sandbox/trunk/src/c/bitfields.c	                        (rev 0)
+++ sandbox/trunk/src/c/bitfields.c	2008-01-20 00:27:16 UTC (rev 247)
@@ -0,0 +1,19 @@
+#include <stdio.h>
+struct s {
+  // This just means that it is 1 bit wide.  It's not standard C (where
+  // bitfields are used only on ints).  Seen in JOSMP.  Some source on the
+  // Internet (forgot where) mentioned that although these may save space, they
+  // may end up generating a surprising amount of code (depending on the
+  // alignment details).
+  unsigned char c : 1;
+};
+int main() {
+  // These are the only two valid values.
+  struct s s = { 1 };
+  struct s t = { 0 };
+  // This wouldn't work.
+  // struct s u = { 2 };
+  printf("%d %d\n", s.c, t.c);
+  return 0;
+}
+// vim:et:sw=2:ts=2


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