How to generate the unique values in array with out using unique keyword

SystemVerilog
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4

In reply to Manikanta Kopparapu:
You can add a state variable that increments each time you call randomize

class unique_array_example;
  rand bit [7:0] array_1[];
  int offset;
  constraint addr_size{array_1.size()==5;}
  constraint addr_unique_values{
      foreach(array_1[i]) array_1[i]==(offset+i*2);}
  function void post_randomize();
    offset++;
  endfunction
endclass:unique_array_example

Again, this series of numbers is not random; it make little sense to do it this way except if this were a homework/interview question.