c++ - Integers and/or array of integers into a single int array using variadic function

I'm trying to write a function, with a variable number of integer/int array parameters, that concatenates all the elements into a single 1-dimensional array. I'm struggling with one of the two scenarios where current_item turns out to be an array instead of just an integer. How can I access the individual elements of this array and assign them to pOutList?

typedef unsigned short      WORD;


int PinListJoin(WORD * pOutList, ...) {

    int index=0;
    boolean isArray = false;

    va_list next_item;
    va_start(next_item, pOutList);
    WORD current_item = va_arg(next_item, WORD);
    int current_item_size = sizeof(current_item) / sizeof(WORD);


    if (current_item_size > 1) {
        isArray = true;
        for (int pinidx = 0; pinidx < current_item_size; pinidx++) {
            pOutList[index] = current_item;
            index++;
        }
    }
    else {
        isArray = false;

        pOutList[index] = current_item;
        index++;
    }

    va_end(next_item);

    return(current_item_size);

}