More examples

[SVN r12609]

example/note.c

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+/* 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_STRINGIZE() can be used to allow macro
+ * expansion before stringization.
+ */
+
+#include <boost/preprocessor/stringize.hpp>
+
+#define NOTE(STR)\
+  message(__FILE__ "(" BOOST_PP_STRINGIZE(__LINE__) ") : " STR)
+
+#pragma NOTE("Hello, World!")

example/static_assert.c

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+/* 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));

example/subscript_layer.cpp

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+/* 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_EMPTY can be used as an unused or
+ * empty parameter.
+ */
+
+#include <boost/preprocessor/empty.hpp>
+
+/* This could be a layer from a generative container library. */
+template<class base>
+struct subscript_layer : base
+{
+#define DEF(CV)\
+  template<class base>\
+  CV() typename base::value_type& operator[](typename base::index_type i) CV()\
+  { return base::begin()[i]; }
+
+  DEF(BOOST_PP_EMPTY)
+  DEF(const BOOST_PP_EMPTY)
+#undef DEF
+};