Multiple instances of covergroup using an array. How to connect "ref" signal in the class from an interface?

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In reply to vinodh1180:

The procedural assignment is allowed, but does not give you the functionality you are looking for. A better idea is defining your covergroup as

overgroup flag_cvg (input bit [63:0] one_hot_bit_position) with function sample(logic [63:0] flag);
  flag_cvp: coverpoint (one_hot_bit_position & flag) != 0;
  option.per_instance = 1;
endgroup : flag_cvg

Then pass the flag value at each sample

foreach(flag_bits[i])
        flag_bits[i].sample(vif.flag);