passing argument to yylex (flex++ and pure parser)

[vl950t]

Hi together,

I have made a reentrant (pure) flex parser without the c++ option. Now I am 
trying to build the same parser with the c++
option to make an input with fstream (and use of iostream) possible. 

So, there are some problems, it seems that the yylex() function doesn't take 
any Parameter in the c++ option, but I need a version which takes a Parameter 
like:  int yylex(YYSTYPE *lvalp) or so, to give the tokens to the bison parser. 

Any ideas?

Another possibility would be that somebody can tell me how to use fstream and 
iostream objects without the c++ 
option declaration (but on a pure parser)


Kind regards
Markus 


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