Added a simple example on using BOOST_PP_LIST_FOR_EACH()

[SVN r12541]

example/array_arithmetic.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 2001
+/* Copyright (C) 2002
  * Housemarque Oy
  * http://www.housemarque.com
  *

example/array_arithmetic_helpers.hpp

@@ -1,7 +1,7 @@
 #ifndef BOOST_LIBS_PREPROCESSOR_EXAMPLE_ARRAY_ARITHMETIC_HELPERS_HPP
 #define BOOST_LIBS_PREPROCESSOR_EXAMPLE_ARRAY_ARITHMETIC_HELPERS_HPP
 
-// Copyright (C) 2001
+// Copyright (C) 2002
 // Housemarque Oy
 // http://www.housemarque.com
 //

example/delay.cpp

@@ -1,4 +1,4 @@
-// Copyright (C) 2001
+// Copyright (C) 2002
 // Housemarque Oy
 // http://www.housemarque.com
 //

example/is_integral.cpp

@@ -0,0 +1,38 @@
+// 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.
+
+#include <boost/preprocessor/list/for_each.hpp>
+#include <boost/preprocessor/tuple/to_list.hpp>
+
+// This is a list of integral types. Strictly speaking the following list
+// does not include all integral types, because some compilers do not yet
+// recognize all standard C++ integral types.
+#define INTEGRAL_TYPES\
+  BOOST_PP_TUPLE_TO_LIST\
+  ( 9\
+  , ( char, signed char, unsigned char,\
+      short, unsigned short,\
+      int, unsigned int,\
+      long, unsigned long )\
+  )
+
+// This is a template for testing is a type is an integral type.
+template<class T> struct is_integral {static const bool value = false;};
+
+#define INTEGRAL_TYPE_SPECIALIZATION(R,_,T)\
+  template<> struct is_integral<T> {static const bool value = true;};\
+  template<> struct is_integral<const T> {static const bool value = true;};\
+  template<> struct is_integral<volatile T> {static const bool value = true;};\
+  template<> struct is_integral<const volatile T> {static const bool value = true;};
+
+BOOST_PP_LIST_FOR_EACH(INTEGRAL_TYPE_SPECIALIZATION,_,INTEGRAL_TYPES)
+#undef INTEGRAL_TYPE_SPECIALIZATION
+#undef INTEGRAL_TYPES