RE: [sv-bc] Constant method calls

Shalom, where did you take this restriction from? I only see 6.19.5,
which says "SystemVerilog includes a set of specialized methods to
enable iterating over the values of enumerated types, which are defined
in 6.19.5.1 through 6.19.5.6.". Both enum variables and enum constants
have enum types, so I would assume that methods apply to both. 

But independently of what LRM says and how it can be interpreted, I
fully agree with Jonathan that such restriction would not make any
sense. I also don't see why an implementation should have a difficulty
with evaluating the methods on enum constants.

--Yulik.

-----Original Message-----
From: owner-sv-bc@server.eda.org [mailto:owner-sv-bc@server.eda.org] On
Behalf Of Jonathan Bromley
Sent: Friday, February 08, 2008 5:57 PM
To: sv-bc@server.eda.org; sv-ec@server.eda.org
Cc: Surya Pratik Saha; Greg Jaxon
Subject: RE: [sv-bc] Constant method calls

Shalom,

> next() is defined for enum variables, not enum constants. 

I guess you're right, but this is indeed a severe, unnecessary
and irritating restriction.  Just imagine if "+" were not 
defined over integer constants but only variables...

  parameter n_bits = 8;
  logic [n_bits-1:0];  //  oops, can't do that

but now it seems we have

  typedef enum {A,B,C} E;
  parameter E mode = B;
  initial $display (mode.name());  // can't do that :-(
  parameter next_mode = B.next();  // nor that :-(

System functions echoing the methods' behaviours would
be just as good, if there's some implementation difficulty
about applying methods to things that aren't variables.
Users could write constant functions, but that seems unfortunate.
-- 
Jonathan Bromley, Consultant

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