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[SVN r12547]
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Vesa Karvonen
2002-01-29 12:24:55 +00:00
parent 3fce5e9ef9
commit 418a1a5654
1 changed files with 16 additions and 19 deletions
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35
example/is_integral.cpp
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@ -9,30 +9,27 @@
// See http://www.boost.org for most recent version. // 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.hpp> #include <boost/preprocessor/list/for_each.hpp>
#include <boost/preprocessor/tuple/to_list.hpp> #include <boost/preprocessor/tuple/to_list.hpp>
#include <boost/preprocessor/empty.hpp>
// This is a list of integral types. Strictly speaking the following list // List of integral types. (Strictly speaking, wchar_t should be on the list.)
// does not include all integral types, because some compilers do not yet
// recognize all standard C++ integral types.
#define INTEGRAL_TYPES\ #define INTEGRAL_TYPES\
BOOST_PP_TUPLE_TO_LIST\ BOOST_PP_TUPLE_TO_LIST(9,(char, signed char, unsigned char, short, unsigned short, int, unsigned, long, unsigned long))
( 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 for testing whether a type is an integral type.
template<class T> struct is_integral {static const bool value = false;}; template<class T> struct is_integral {enum {value = false};};
#define INTEGRAL_TYPE_SPECIALIZATION(R,_,T)\ // Macro for defining a specialization of is_integral<> template.
template<> struct is_integral<T> {static const bool value = true;};\ // NOTE: CV is invoked so that it is possible to pass empty cv-qualifiers.
template<> struct is_integral<const T> {static const bool value = true;};\ #define IS_INTEGRAL_SPECIALIZATION(_,CV,T)\
template<> struct is_integral<volatile T> {static const bool value = true;};\ template<> struct is_integral<CV() T> {enum {value = true};};
template<> struct is_integral<const volatile T> {static const bool value = true;};
BOOST_PP_LIST_FOR_EACH(INTEGRAL_TYPE_SPECIALIZATION,_,INTEGRAL_TYPES) BOOST_PP_LIST_FOR_EACH(IS_INTEGRAL_SPECIALIZATION, BOOST_PP_EMPTY, INTEGRAL_TYPES)
#undef INTEGRAL_TYPE_SPECIALIZATION BOOST_PP_LIST_FOR_EACH(IS_INTEGRAL_SPECIALIZATION, const BOOST_PP_EMPTY, INTEGRAL_TYPES)
BOOST_PP_LIST_FOR_EACH(IS_INTEGRAL_SPECIALIZATION, volatile BOOST_PP_EMPTY, INTEGRAL_TYPES)
BOOST_PP_LIST_FOR_EACH(IS_INTEGRAL_SPECIALIZATION, const volatile BOOST_PP_EMPTY, INTEGRAL_TYPES)
#undef IS_INTEGRAL_SPECIALIZATION
#undef INTEGRAL_TYPES #undef INTEGRAL_TYPES