mapping token identifier to value

Hi Akim,

I'm trying to get rid of numbering tokens and let bison do that but it seems to be more difficult than I thought. Although, I managed to come up with an idea as I'm anyway generating the bison source I could generate a map like:

    std::map<std::string, unsigned int> symbol2token={<!-- -->
            { "t_Con", yy::parser::token::t_Con },
            ...
    };

and could then get the values simply by:

symbol2token.find("t_Con")->second;

However, still wanted to ask if there's any better solution maybe one that I overlooked and is provided by bison itself;)

Best regards,
r0ller
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