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From: mcc@tyrolia.cs.princeton.edu (Martin C. Carlisle)
Subject: Re: Ada type (yacc)YYSTYPE is ?
Date: 1999/01/19
Message-ID: <782fs9$h3k$1@cnn.Princeton.EDU>#1/1
X-Deja-AN: 434473217
References: <77qu4d$jt8@lotho.delphi.com> <yx8btjvn4ts.fsf@gatefield.com>
 <36a43307.39889065@news.pacbell.net> <7826ad$l3$1@nnrp1.dejanews.com>
Organization: US Air Force Academy, Dept of Computer Science
Newsgroups: comp.lang.ada
Date: 1999-01-19T00:00:00+00:00
List-Id: <comp.lang.ada>

In article <7826ad$l3$1@nnrp1.dejanews.com>,  <rdt@liyorkrd.li.co.uk> wrote:
>In article <36a43307.39889065@news.pacbell.net>,
>  tmoran@bix.com (Tom Moran) wrote:
>> >Having you considering using aflex? This is an Ada implementation of
>> >the flex lexical analyzer generator. It has a companion parser
>> >generator ayacc.
>>   I'm using them.  But their docs just suggest "subtype yystype is
>> integer;" or variant records.
>
>I have used these tools and from what I can remember, you are free to use
>whatever type you like.  If you are going to compile the resultant code with
>and Ada95 compiler then I can see no reason why you can't use an Ada95
>construct.

I usually use "subtype YYSTYPE is access all Parseable'Class" -- you can do
some really neat OO style parsing this way.

--Martin

-- 
Martin C. Carlisle, Asst Prof of Computer Science, US Air Force Academy
mcc@cs.usafa.af.mil, http://www.usafa.af.mil/dfcs/bios/carlisle.html
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