nested Class in Modelsim

Does ModelSim support nested class testbench codes...Can any body tell in which verilog simulator does this code works ? This code is shownig error in my Modelsim SE


** Error: C:/Sunil_Labs/Lab1/example2.sv(31): (vlog-60) Nested class declarations not yet supported.


////////////CODE/////////////////

class figure;
virtual function void draw();
$display("figure:draw");
endfunction

function void compute_area();
$display("figure:compute_area");
endfunction
endclass


class polygon extends figure;
virtual function void draw();
$display("polygon:draw");
endfunction
function void compute_area();
$display("polygon:compute_area");
endfunction
endclass


class square extends polygon;
virtual function void draw();
$display("square:draw");
endfunction
function void compute_area();
$display("square:compute_area");
endfunction


class square extends polygon;
virtual function void draw();
$display("square:draw");
endfunction
function void compute_area();
$display("square:compute_area");
endfunction
endclass


module top;
figure f;
polygon p;
square s;
initial begin
s = new();
f = s;
p = s;
p.draw();
p.compute_area();
f.draw();
f.compute_area();
s.draw();
s.compute_area();
end
endmodule

You do not need nested classes for this example, you simply forgot an endclass statement.

dave_59 said:

You do not need nested classes for this example, you simply forgot an endclass statement.

Click to expand...

Hi Sir,

Actually I got this example from OVM cookbook where it has given this example to show the use of virtual function, so in ModelSim it is showing error as it wont support nested class declaration ,So I want to know whether its invalid to declare nested class or Questa sim supports it?
so please guide about this

Regards
SUNIL

ModelSim eventually supported nested class declarations in versions after 10.1

But the example code you show here will never compile because there is a missing endclass. Even with nested classes, there needs to be a matching endclass for each class declaration. The error message is misleading because the intent was never to have an nested class. The fix is not to add an endclass, but to remove the duplicated class square text.

dave_59 said:

ModelSim eventually supported nested class declarations in versions after 10.1

But the example code you show here will never compile because there is a missing endclass. Even with nested classes, there needs to be a matching endclass for each class declaration. The error message is misleading because the intent was never to have an nested class. The fix is not to add an endclass, but to remove the duplicated class square text.

Click to expand...

Hi sir
Oh great, Now I got you and your post really helped thank You so much

Regards
SUNIL