[vhdl-200x-ft] Case? statements and selected assignments

Folks,

In FT24, we propose a case? statement that allows for don't-care matching
using the ?= operator.  In preparing an LCS for this, I found it appropriate
to describe case? as a variant of the existing case statement, sicne most of
the rules are the same.  I just added a ? delimiter as optional syntax after
the case keyword.

That made me think that we should then formulate don't-care matching
variants of selected signal and variable assignments.  Doing so would
complete the correspondences.  It would simply require saying that if a ?
appears in the selected form, it also appears in the equivalent form.  For
example,

  with E select?
    S <= bla1 when "00--",
         bla2 when "01--",
         bla3 when "1---";

would be equivalent to

  case? E is
    "00--" => S <= bla1;
    "01--" => S <= bla2;
    "1---" => S <= bla3;
  end case?;

and similarly for a selected variable assignment.

Any objection to persuing this?

Cheers,

PA

--
Dr. Peter J. Ashenden                        peter@ashenden.com.au
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