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

In article 06-03-077, "Christoph B."
<dj.cyberdance@gmx.at> wrote:


> First, my YYSTYPE union looked like this:
>
> %union
....
> 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. Is there a way to define the data format for nonterminals
> outside from YYSTYPE?


One can do it, but not yet officially using Bison, though it is on the
agenda. Right now, using %union only admits C++ POD types (essentially C
legacy types), as the parser implementation uses C/C++ union. If you do
not use %union, you can define YYSTYPE to any C++ type, but there are some
problems with placing the C++ code. Therefore, I use a special Bison tweak
for that, hoping that eventually it should become a part of Bison. But if
you are programming conservatively, you may not need this, but you can
attempt to use Bison's official C++ skeleton file.


--
    Hans Aberg

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