How to calculate the sum of data in a queue of bits in SystemVerilog?

The built-in array method sum() will return a value according to the type of queue.
such as:

bit flags[$];

....

flags.sum() will return 0 or 1 because the type of queue is bit

Solution

To actually sum the queue data use:

mysum = flags.sum() with (int'(item));

Below is an example for reference:

module test;

 bit flags[$];

 int mysum;

 initial

 begin

 flags[0] =1;

 flags[1]=1;

 mysum = flags.sum();  //this will return 0 or 1

 $display("%0d",mysum);

 mysum = flags.sum() with (int'(item));  //this will return the total value of every element.

 $display("%0d",mysum);

end

endmodule