User guide

24-60
SystemVerilog Testbench Constructs
Figure 24-1 Base and Sub Classes
When a subclass is instantiated, the constructor of the extended
super class is implicitly called. If that class, in turn, has a super class,
it will implicitly call the constructor of that class. This will continue up
the hierarchy until no further super classes exist. In Figure 24-2,
Base Class
Subclass
ClassA
Class_a
Class_ab
Class_b