Merge "Use size_t instead of int for integer_sequence.size()"

template <typename F, typename T, T... I>

constexpr auto generate_flag_values(std::integer_sequence<T, I...> seq) {

    constexpr int count = seq.size();

    constexpr size_t count = seq.size();

    std::array<F, count> values{};

    for (int i = 0, v = 0; v < count; ++i) {

    for (size_t i = 0, v = 0; v < count; ++i) {

        values[v++] = static_cast<F>(T{1} << i);

    }