Class count

test-app/runtime/src/main/cpp/include/v8-fast-api-calls.h:577–577

// Helper to count the number of occurances of `T` in `List`
template <typename T, typename... List>
struct count : std::integral_constant<int, 0> {};
template <typename T, typename... Args>
struct count<T, T, Args...>
    : std::integral_constant<std::size_t, 1 + count<T, Args...>::value> {};