diff --git a/example/delay.cpp b/example/delay.cpp
new file mode 100644
index 0000000..b82d059
--- /dev/null
+++ b/example/delay.cpp
@@ -0,0 +1,79 @@
+// Copyright (C) 2001
+// 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.
+
+#include <boost/preprocessor/while.hpp>
+#include <boost/preprocessor/dec.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/empty.hpp>
+
+// The time complexity of DELAY(N) is O(pow(2,N)).
+//
+// Handy when recompiles are too fast to take a coffee break. :)
+
+#ifndef DELAY_MAX
+#define DELAY_MAX 16
+#endif
+
+#define DELAY(N) BOOST_PP_IF(1,BOOST_PP_EMPTY,BOOST_PP_WHILE(DELAY_C,BOOST_PP_CAT(DELAY_F,N),BOOST_PP_DEC(N)))()
+#define DELAY_C(D,N) N
+#define DELAY_F0(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F1(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F2(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F3(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F4(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F5(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F6(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F7(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F8(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F9(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F10(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F11(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F12(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F13(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F14(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F15(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F16(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F17(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F18(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F19(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F20(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F21(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F22(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F23(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F24(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F25(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F26(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F27(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F28(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F29(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F30(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F31(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F32(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F33(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F34(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F35(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F36(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F37(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F38(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F39(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F40(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F41(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F42(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F43(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F44(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F45(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F46(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F47(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F48(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F49(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+#define DELAY_F50(D,N) BOOST_PP_IF(1,BOOST_PP_DEC(N),BOOST_PP_WHILE##D(DELAY_C,DELAY_F##N,BOOST_PP_DEC(N)))
+
+DELAY(DELAY_MAX)