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Somewhat more C friendly. Uses templates...

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[SVN r12554]
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Vesa Karvonen
2002-01-29 14:30:09 +00:00
parent 9e361682af
commit 59180fab96
1 changed files with 6 additions and 5 deletions
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11
example/is_integral.cpp
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@ -10,21 +10,22 @@
* 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. /* 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> #include <boost/preprocessor/empty.hpp>
// List of integral types. (Strictly speaking, wchar_t should be on the list.) /* List of integral types. (Strictly speaking, wchar_t should be on the list.) */
#define INTEGRAL_TYPES\ #define INTEGRAL_TYPES\
BOOST_PP_TUPLE_TO_LIST(9,(char, signed char, unsigned char, short, unsigned short, int, unsigned, long, unsigned long)) BOOST_PP_TUPLE_TO_LIST(9,(char, signed char, unsigned char, short, unsigned short, int, unsigned, long, unsigned long))
// Template for testing whether a type is an integral type. /* Template for testing whether a type is an integral type. */
template<class T> struct is_integral {enum {value = false};}; template<class T> struct is_integral {enum {value = false};};
// Macro for defining a specialization of is_integral<> template. /* Macro for defining a specialization of is_integral<> template.
// NOTE: CV is invoked so that it is possible to pass empty cv-qualifiers. * NOTE: CV is invoked so that it is possible to pass empty cv-qualifiers.
*/
#define IS_INTEGRAL_SPECIALIZATION(_,CV,T)\ #define IS_INTEGRAL_SPECIALIZATION(_,CV,T)\
template<> struct is_integral<CV() T> {enum {value = true};}; template<> struct is_integral<CV() T> {enum {value = true};};