C ++ element initialization order in an aggregated class

Question

I know that in the aggregate class

Each element of the array or non-static member of the class in the index / appearance order of the array in the class definition is initialized with a copy from the corresponding sentence of the initializer list.

But my question is: can we use the previous initialized elements during initialization? How:

std::array<int, 2> d = { 3, d[0] }; 

or

 int d[] = {3, d[0]}; 

Thanks!