Re: Problem with Flex/Bison and C/C++

Chris F Clark <cfc@shell01.TheWorld.com>
27 Mar 2006 01:26:37 -0500

          From comp.compilers

Related articles
Problem with Flex/Bison and C/C++ dj.cyberdance@gmx.at (Christoph B.) (2006-03-22)
Re: Problem with Flex/Bison and C/C++ johnmillaway@yahoo.com (John Millaway) (2006-03-27)
Re: Problem with Flex/Bison and C/C++ cfc@shell01.TheWorld.com (Chris F Clark) (2006-03-27)
Re: Problem with Flex/Bison and C/C++ haberg@math.su.se (2006-03-27)
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From: Chris F Clark <cfc@shell01.TheWorld.com>
Newsgroups: comp.compilers
Date: 27 Mar 2006 01:26:37 -0500
Organization: The World Public Access UNIX, Brookline, MA
References: 06-03-077
Keywords: parse, C++

Christoph asked:
> So my question is if there is a simple way to have all the tokens as
> strings and integers and have nonterminals with more complicated C++
> data types.


Yes, put only pointers in your union. You can then use a "void *" (or
char *) pointer in your lexer and that will work in C. There are
other reasons why using only pointers in your union is a good
solution. However, let me just say that your union is to help hook you
resulting AST together, and as such you want to have a pointer to the
object being linked and not a copy of the object being linked.


There are also versions of "lex" that generate C++. I would recommend
finding one of them for the long run.


Hope this helps,
-Chris


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