1 # /* Copyright (C) 2002
2 #  * Housemarque Oy
3 #  * http://www.housemarque.com
4 #  *
5 #  * Distributed under the Boost Software License, Version 1.0. (See
6 #  * accompanying file LICENSE_1_0.txt or copy at
7 #  * http://www.boost.org/LICENSE_1_0.txt)
8 #  */
9 #
10 # /* Revised by Paul Mensonides (2002) */
11 #
12 # /* See http://www.boost.org for most recent version. */
13 #
14 # /* This example demonstrates the usage of preprocessor lists for generating C++ code. */
15 #
16 # include <boost/preprocessor/facilities/empty.hpp>
17 # include <boost/preprocessor/list/at.hpp>
18 # include <boost/preprocessor/list/for_each_product.hpp>
19 # include <boost/preprocessor/tuple/elem.hpp>
20 # include <boost/preprocessor/tuple/to_list.hpp>
21 #
22 # /* List of integral types.  (Strictly speaking, wchar_t should be on the list.) */
23 # define INTEGRAL_TYPES \
24    BOOST_PP_TUPLE_TO_LIST( \
25       9, (char, signed char, unsigned char, short, unsigned short, int, unsigned, long, unsigned long) \
26    ) \
27    /**/
28 #
29 # /* List of invokeable cv-qualifiers */
30 # define CV_QUALIFIERS \
31    BOOST_PP_TUPLE_TO_LIST( \
32       4, (BOOST_PP_EMPTY, const BOOST_PP_EMPTY, volatile BOOST_PP_EMPTY, const volatile BOOST_PP_EMPTY) \
33    ) \
34    /**/
35 #
36 # /* Template for testing whether a type is an integral type. */
37 
38 template<class T> struct is_integral {
39    enum { value = false };
40 };
41 
42 # /* Macro for defining a specialization of is_integral<> template. */
43 # define IS_INTEGRAL_SPECIALIZATION(R, L) \
44    template<> struct is_integral<BOOST_PP_TUPLE_ELEM(2, 0, L)() BOOST_PP_TUPLE_ELEM(2, 1, L)> { \
45       enum { value = true }; \
46    }; \
47    /**/
48 
49 BOOST_PP_LIST_FOR_EACH_PRODUCT(IS_INTEGRAL_SPECIALIZATION, 2, (CV_QUALIFIERS, INTEGRAL_TYPES))
50