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