module test;
  `include "urm.svh"
  class mydata extends urm_object;
    int sz;
    byte payload[]
 
    function void resize(int size);
      sz = size;
      payload = new[sz](payload);
    endfunction
 
    function void do_pack (ref bit bitstream[],
                           input urm_packer      packer);
      //Used to size the bitstream array
      if(packer.nopack) begin
         packer.count+= (payload.size()*8) + $bits(sz);
         return;
      end
 
      for(int i=$bits(sz)-1; i>=0; --i) begin
        bitstream[packer.count] = sz>>i; packer.count++;
      end
      for(int j=0; j<payload.size(); ++j)
        for(int i=7; i>=0; --i) begin
          bitstream[packer.count] = payload[j]>>i; packer.count++;
        end
    endfunction
    function void do_unpack (ref bit bitstream[],
                           input urm_packer      packer);
      sz = 0; 
      for(int i=0; i<$bits(sz); ++i) begin
        sz = (sz<<1) + bitstream[packer.count] packer.count++;
      end
      resize(sz);
      for(int j=0; j&lt;payload.size(); ++j) begin
        for(int i=7; i>=0; --i) begin
          payload[j] = (payload[j]<<1) + bitstream[packer.count] packer.count++;
        end
      end
    endfunction
 
    `urm_object_utils_begin(mydata)
      `urm_field_int(sz, DEFAULT)
      `urm_field_array_int(payload, DEFAULT)
    `urm_object_utils_end
 
  endclass
  mydata md = new;
  mydata md2 = new;
 
  bit bits[]
  initial begin
    md.set_name("md"); md2.set_name("md2");
    md.resize(10);
    for(int i=0; i<10; ++i) md.payload[i] = i*i;
    void'(md.pack(bits));
    void'(md2.unpack(bits));
    md.print();
    md2.print();
  end
endmodule