Re: Not able to use %union?

[Akim Demaille]

> Le 18 févr. 2019 à 04:37, Peng Yu <address@hidden> a écrit :
> 
> Since %union cannot be used in this case, how to deal with this
> scenario in bison? Thanks.

You want to read the documentation of api.value.type.

For instance:

          ‘{TYPE}’
               Use this TYPE as semantic value.
                    %code requires
                    {
                      struct my_value
                      {
                        enum
                        {
                          is_int, is_str
                        } kind;
                        union
                        {
                          int ival;
                          char *sval;
                        } u;
                      };
                    }
                    %define api.value.type {struct my_value}
                    %token <u.ival> INT "integer"
                    %token <u.sval> STR "string"