template<typename conv, typename T>
T byteswap(T from, size_t size){
    const size_t INsize = sizeof(*from);
    const size_t convsize = sizeof(conv);
    size_t sizeinbytes = size*INsize;

    static_assert(convsize % 2 == 0);
    assert(sizeinbytes % convsize == 0);

    uchar *bytearray = reinterpret_cast<uchar*>(from);

    for(int i = 0; i < sizeinbytes / convsize; i++)
        for(int j = 0; j < convsize / 2; j++)
            swap(bytearray[i*convsize + j], bytearray[i*convsize + convsize - j - 1]);

    return reinterpret_cast<T>(bytearray);
}