MACRO fields

#include <iostream>
/* This will let macros expand before concating them */
#define CROSS_COMPILER_INTERFACE_PRIMITIVE_CAT(x, y) x ## y
#define CROSS_COMPILER_INTERFACE_CAT(x, y) CROSS_COMPILER_INTERFACE_PRIMITIVE_CAT(x, y)


// Adapted from http://stackoverflow.com/questions/11920577/casting-all-parameters-passed-in-macro-using-va-args
// With adaptations for MSVC from BOOST_PP

/* This counts the number of args */
#define CROSS_COMPILER_INTERFACE_NARGS_SEQ(_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26,_27,_28,_29,_30,_31,_32,_33,_34,_35,_36,_37,_38,_39,_40,N,...) N
#ifdef _MSC_VER
#define CROSS_COMPILER_INTERFACE_NARGS(...) CROSS_COMPILER_INTERFACE_CAT(CROSS_COMPILER_INTERFACE_NARGS_SEQ(__VA_ARGS__,40, 39, 38, 37, 36, 35, 34, 33, 32, 31,30 , 29, 28, 27, 26, 25, 24, 23, 22, 21, 20,19 ,18 ,17 , 16 , 15 , 14 , 13, 12, 11, 10 , 9, 8, 7, 6, 5, 4, 3, 2, 1),)
#else
#define CROSS_COMPILER_INTERFACE_NARGS(...) CROSS_COMPILER_INTERFACE_NARGS_SEQ(__VA_ARGS__,40, 39, 38, 37, 36, 35, 34, 33, 32, 31,30 , 29, 28, 27, 26, 25, 24, 23, 22, 21, 20,19 ,18 ,17 , 16 , 15 , 14 , 13, 12, 11, 10 , 9, 8, 7, 6, 5, 4, 3, 2, 1)

#endif


/* This will call a macro on each argument passed in */
#ifdef _MSC_VER
#define CROSS_COMPILER_INTERFACE_APPLY(macro, ...) CROSS_COMPILER_INTERFACE_CAT(CROSS_COMPILER_INTERFACE_APPLY_, CROSS_COMPILER_INTERFACE_NARGS(__VA_ARGS__))CROSS_COMPILER_INTERFACE_CAT(( macro, __VA_ARGS__),)
#else
#define CROSS_COMPILER_INTERFACE_APPLY(macro, ...) CROSS_COMPILER_INTERFACE_CAT(CROSS_COMPILER_INTERFACE_APPLY_, CROSS_COMPILER_INTERFACE_NARGS(__VA_ARGS__))( macro, __VA_ARGS__)
#endif
#define CROSS_COMPILER_INTERFACE_APPLY_1(m, x1) m(x1)
#define CROSS_COMPILER_INTERFACE_APPLY_2(m, x1, x2) m(x1), m(x2)
#define CROSS_COMPILER_INTERFACE_APPLY_3(m, x1, x2, x3) m(x1), m(x2), m(x3)
#define CROSS_COMPILER_INTERFACE_APPLY_4(m, x1, x2, x3, x4) m(x1), m(x2), m(x3), m(x4)
#define CROSS_COMPILER_INTERFACE_APPLY_5(m, x1, x2, x3, x4, x5) m(x1), m(x2), m(x3), m(x4), m(x5)
#define CROSS_COMPILER_INTERFACE_APPLY_6(m, x1, x2, x3, x4, x5, x6) m(x1), m(x2), m(x3), m(x4), m(x5), m(x6)
#define CROSS_COMPILER_INTERFACE_APPLY_7(m, x1, x2, x3, x4, x5, x6, x7) m(x1), m(x2), m(x3), m(x4), m(x5), m(x6), m(x7)
#define CROSS_COMPILER_INTERFACE_APPLY_8(m, x1, x2, x3, x4, x5, x6, x7, x8) m(x1), m(x2), m(x3), m(x4), m(x5), m(x6), m(x7), m(x8)


#define CROSS_COMPILER_INTERFACE_STR(x) #x

#define FOO_EACH(x) CROSS_COMPILER_INTERFACE_STR(x)
#define FOO(...) CROSS_COMPILER_INTERFACE_APPLY(FOO_EACH, __VA_ARGS__)

int main(){

    int k = CROSS_COMPILER_INTERFACE_NARGS(a,b,c,d);
    const char* fields[] = {FOO(a,b,c,d)};

    for(int i =0; i<sizeof(fields)/sizeof(fields[0]); i++){
        std::cout << fields[i] << " ";
    }

}