How to "or" a generic array of std_logic_vector ?

I have an array of std_logic_vector.

type array_of_std_logic_vector is array (0 to
number_of_rotors_array-1) of std_logic_vector(0 to
data_width_array-1);
signal data_out_array       : array_of_std_logic_vector;

I want to "or" the "bits" of std_logic_vector for each element of the
vector like this.
data_out(i) shall be '1' if one of the elements of the vector has set
this bit to one.

data_out(0) <=3D '1' when unsigned(data_out_array(0)) /=3D 0;
data_out(1) <=3D '1' when unsigned(data_out_array(1)) /=3D 0;

The problem is that number_of_rotors and although data_width_array are
generic.

So, what is the solution ?

Thank=B4s for help