Does extended class inherit base class constructor

SystemVerilog
,
1

Hi ,

I have a base class defined as ::



class Base # ( type T = int ) ;
T a ;
function new ( T ip_a ) ;
   a = ip_a ;
endfunction

// Has another function defined
function void A ();
....
endfunction
endclass

So now I define an extended class with simply an addition method ::



class Ext # ( type T = int ) extends Base ;

function DISP;
  $display("a is %0d",a);
endfunction

endclass

My Question is since the ext class has only an extra method defined , do I need to define a constructor for Ext class ?
Won’t the constructor and function A from Base class be inherited ?

Thanks

2

In reply to TC_2017:

I suggest trying the code and then looking at my short course on SystemVerilog classes, especially the second session.

3

In reply to dave_59:

Hi Dave ,

Since base class Constructor has arg. the default Constructor inserted by SV won’t work , hence the compilation error . I tried a few solution and chaining constructor was one of them which worked for above Sample code .



class Ext # ( type T = int )  extends Base # ( T ) ( 10 )  ;
....
endclass

Ext e1 = new() ; // No args. required !!

I have another question using chained Constructor .

I extend uvm_blocking_put_port class ( I add some method to it let’s say ) . Now typically the uvm_blocking_put_port would be used in my code as follows :


class producer extends uvm_component ;

 `uvm_component_utils(producer)
 
 uvm_blocking_put_port #(trans) put_port ;

 // 3-line Component Constructor here

  function void build_phase ( uvm_phase phase ) ;
     put_port = new("put_port",this);
  endfunction

Now instead I want to use my_blocking_put_port . But I want the declaration to use chain constructor


class my_blocking_put_port #( type T = int ) extends uvm_blocking_put_port # ( T ) ("put_port" , this  ) ; // 'this' doesn't work , since no object exists here 


class producer extends uvm_component ;

 `uvm_component_utils(producer)
 
 my_blocking_put_port #(trans) put_port ;

 // NO Constructor here !!

  function void build_phase ( uvm_phase phase ) ;
     put_port = new(); // Want to use this format . 
  endfunction

Is there a way to declare my_blocking_put_port using Chained Constructor ?
Does Chained Constructor work only for classes without handle as args. ?.

Thanks