I>#define LENGTH(a) (sizeof(a) / sizeof(*a))
I>

template <std::size_t N>
struct TypeWhichHasSizeExactly
{
    typedef char (&type)[N];
};

template <typename ArrayElementT, std::size_t N>
typename TypeWhichHasSizeExactly<N>::type arrayLengthHelper(ArrayElementT (&)[N]);

#define ARRAY_LENGTH(array) sizeof(arrayLengthHelper(array))