RE: [sv-ec] streaming operator and const members of class

Daniel,

There is a similar restriction when a field is local or protected.

Although it seems like a nice idea, in practice, the ability to stream a
class as a whole never works out. None of the *VM methodologies will
allow this not only because of those restrictions, but because there are
fields in the base class that the user would never be part of the
stream.

Dave Rich
Verification Technologist
Mentor Graphics Corporation
New Office Number: 510-354-7439

  <http://www.twitter.com/dave_59> <http://go.mentor.com/drich>

From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf Of
Daniel Mlynek
Sent: Tuesday, March 01, 2011 11:10 PM
To: Steven Sharp
Cc: sv-ec@eda.org
Subject: Re: [sv-ec] streaming operator and const members of class

On the other hand user want just to put stream into class as single
atomic operation. He may do not care about const at this time
If it will be block then he will have no possibility of using streaming
with classes which has const.
That is imho too restrictive.

DANiel

On 3/1/2011 7:41 PM, Steven Sharp wrote:

It is an assignment to a const, so I would expect an error.

________________________________

        From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf
Of Daniel Mlynek
        Sent: Tuesday, March 01, 2011 9:50 AM
        To: sv-ec@eda.org
        Subject: [sv-ec] streaming operator and const members of class

        LRM does not say explicitly how should tool behave if there is a
streaming operator used to unpack stream into a class which has const
fields.
        Const field cannot be changed - so in such situation tool should
trigger an error?
        On the other hand this kind of operation is not typical
assignment to const which is not allowed.
        
        Any opinions - how should below code behave
        
        CODE:

        class A;
            const byte a=1;
            const byte b;
            byte c;
            function new;
                b=2;
            endfunction
        endclass
        
        module top;
        A a=new;
        initial begin
            {>>{a}} = 24'h020304;
        end
        endmodule

        DANiel
        
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