Files
preprocessor/example/is_integral.cpp
Vesa Karvonen 00d4dc6155 Updated
[SVN r12692]
2002-02-04 15:00:30 +00:00

39 lines
1.6 KiB
C++

/* 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 demonstrates the usage of preprocessor lists for generating C++ code. */
#include <boost/preprocessor/list/for_each_product.hpp>
#include <boost/preprocessor/list/at.hpp>
#include <boost/preprocessor/tuple/to_list.hpp>
#include <boost/preprocessor/empty.hpp>
/* List of integral types. (Strictly speaking, wchar_t should be on the list.) */
#define INTEGRAL_TYPES\
BOOST_PP_TUPLE_TO_LIST(9,(char, signed char, unsigned char, short, unsigned short, int, unsigned, long, unsigned long))
/* List of invokeable cv-qualifiers. */
#define CV_QUALIFIERS\
BOOST_PP_TUPLE_TO_LIST(4,(BOOST_PP_EMPTY, const BOOST_PP_EMPTY, volatile BOOST_PP_EMPTY, const volatile BOOST_PP_EMPTY))
/* Template for testing whether a type is an integral type. */
template<class T> struct is_integral {enum {value = false};};
/* Macro for defining a specialization of is_integral<> template. */
#define IS_INTEGRAL_SPECIALIZATION(R,L)\
template<> struct is_integral<BOOST_PP_TUPLE_ELEM(2,0,L)() BOOST_PP_TUPLE_ELEM(2,1,L)> {enum {value = true};};
BOOST_PP_LIST_FOR_EACH_PRODUCT(IS_INTEGRAL_SPECIALIZATION,2,(CV_QUALIFIERS, INTEGRAL_TYPES))
#undef IS_INTEGRAL_SPECIALIZATION
#undef CV_QUALIFIERS
#undef INTEGRAL_TYPES