union tUnion {
        int p;
        float f;
        tUnion(double t): f(t) {}
        tUnion(int t): p(t) {}
};

struct tItem {
        const uint8_t type;
        const float info;
        tUnion u;
        tItem(const int t, const double in, int p): type(t), info(in), u(p) {};
        tItem(const int t, const double in, double p): type(t), info(in), u(p) {};
};

const tItem Item[]= {
    {tItem(1, 2.1, 1)},
    {tItem(23, 1.2, 3.2)}
};

typedef unsigned char uint8_t;
typedef unsigned long uint32_t;

union tUnionDat {
         uint32_t p;
         float f;
         tUnionDat(float a)
         {
            f = a;
         }
         tUnionDat(uint32_t a)
         {
             p = a;
         }
};

typedef struct {
         uint8_t type;
         uint8_t info[4];
         tUnionDat u;
} tItem;

const tItem Item[] = {
         {2, {1,2,4,2}, (float)1.5},
         {1, {2,2,4,2}, (uint32_t)10},
         {2, {3,2,4,2}, (float)2.3}
};