为此引出概念virtual class和pure virtual method。 virtual class 不允许被实例化,因为它仅仅是一个原型。如果你希望实例化一个virtual class,会得到一个编译错误。 virtual class 是很多方法学类库(配置、打印和进程通信等等)的一个基础,例如UVM。 声明一个virtual class 的方法很简单,就是在声明时加上关键字“virt...
in 'virtual class' BaseClass function void disp( ); $display("pure virtual function 'disp' of baseClass implemented in class ChildClass"); endfunction function void disp1( ); $display("virtual function 'disp1' of baseClass overridden in class ChildClass"); endfunction endclass module tb;...
Published tutorial and methodology material on SystemVerilog has overwhelmingly recommended use of the virtual interface construct to achieve this interaction. A virtual interface is a reference to a static interface instance. The class-based test environment, constructed dynamically at the beginning of a...
Visual representations of models have a mixed history. In circuit design, schematic diagrams used to be routinely used to capture all of the essential information needed to implement some systems. Today, schematics are usually replaced by text inhardware description languagessuch as VHDL orVerilog. ...
ChildClass child; initial begin //base = new; //cannot instantiate virtual class - Compile ERROR child = new; base = child; //upcasting base.disp; base.disp1; base.disp2; end endmodule 仿真log: pure virtual function 'disp' of baseClass implemented in class ChildClass ...