Group: Comparators

A common function of testbenches is to compare streams of transactions for
equivalence. For example, a testbench may compare a stream of transactions from
a DUT with expected results.

The UVM library provides a base class called ~uvm_in_order_comparator~ and two
derived classes: ~uvm_in_order_built_in_comparator~ for comparing
streams of built-in types and ~uvm_in_order_class_comparator~ for comparing
streams of class objects.

The ~uvm_algorithmic_comparator~ also compares two streams of transactions,
but the transaction streams might be of different type objects. Thus, this
comparator will employ a user-defined transformation function to
convert one type to another before performing a comparison.

(see uvm_ref_comparators.gif)