In reply to UVM_learner6:
package some_pkg;
int some_queue [$];
endpackage : some_pkg
class class_a;
function new;
some_pkg::some_queue.push_front(32);
endfunction : new
endclass : class_a
class class_b;
function new;
some_pkg::some_queue.push_front(16);
endfunction : new
endclass : class_b