How to clean up on a parse error

Hi!


I'm using bison++ to parse the usual expression. I have
a rule like:


exprlist : exprlist '+' expr
                      {
                              ...
                      }
                  | exprlist '-' expr
                  ......


My problem is that after exprlist has been parsed successfully &
some memory has been allocated for it, if there is no '+' following
or the following expr is invalid, how can I free the memory
allocated for exprlist?


Thank you very very much!
--
Kent Tong (tongk@archsci.arch.su.edu.au)
[Freeing memory on yacc parse errors has never been easy. In C parsers,
I usually chain the memory blocks together so I can free them all at once
at the end of the parse. But C++ discourages such hacks. -John]
--

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