More examples

[SVN r12609]

example/static_assert.c

@@ -0,0 +1,22 @@
+/* Copyright (C) 2002
+ * Housemarque Oy
+ * http://www.housemarque.com
+ *
+ * Permission to copy, use, modify, sell and distribute this software is
+ * granted provided this copyright notice appears in all copies. This
+ * software is provided "as is" without express or implied warranty, and
+ * with no claim as to its suitability for any purpose.
+ *
+ * See http://www.boost.org for most recent version.
+ */
+
+/* This example shows how BOOST_PP_CAT() can be used to allow macro
+ * expansion before token concatenation.
+ */
+
+#include <boost/preprocessor/cat.hpp>
+
+#define STATIC_ASSERT(EXPR)\
+  typedef char BOOST_PP_CAT(static_assert_,__LINE__)[ (EXPR) ? 1 : -1 ]
+
+STATIC_ASSERT(sizeof(int) <= sizeof(long));