Re: How to use C++ types in '%union declaration'

[Hans Aberg]

Is it the C-parser you compile as C++? The "specifier-qualifier-list"  
seems to be a C-thing; see line 50 of
  http://home.att.ne.jp/omega/kikuchi/036.html

  Hans Aberg


On 24 Feb 2007, at 19:09, Bob Rossi wrote:

> Hi,
>
> I'm using bison, and giving it an input parser named foo.yxx. Doing
> this has it generate a foo.cxx file. So, I use g++ to compile the
> generated parser.
>
> I'm using the %union declaration described here,
>   http://www.gnu.org/software/bison/manual/html_mono/ 
> bison.html#Union-Decl
>
> How come if I do
>
>   %union {
>     std::string *foo;
>   }
>
> I get,
>   error: expected specifier-qualifier-list before ‘std’
>
> I found a work around, which is to do
>   struct s {
>     std::string foo;
>   };
>   %union {
>     struct s *foo;
>   };
>
> Do I have to do it this way? Is there a better work around?
>
> Thanks,
> Bob Rossi