(flex.info)ERASEME55

---

Next: ERASEME56 Prev: I need to scan if-then-else blocks and while loops Up: FAQ

---

Enter node , (file) or (file)node

ERASEME55
=========

     To: Colin Paul Adams <colin@colina.demon.co.uk>
     Subject: Re: Flex C++ classes and Bison
     In-reply-to: Your message of 09 Aug 1997 17:11:41 PDT.
     Date: Fri, 15 Aug 1997 10:48:19 PDT
     From: Vern Paxson <vern>
     
     > #define YY_DECL   int yylex (YYSTYPE *lvalp, struct parser_control
     > *parm)
     >
     > I have been trying  to get this to work as a C++ scanner, but it does
     > not appear to be possible (warning that it matches no declarations in
     > yyFlexLexer, or something like that).
     >
     > Is this supposed to be possible, or is it being worked on (I DID
     > notice the comment that scanner classes are still experimental, so I'm
     > not too hopeful)?
     
     What you need to do is derive a subclass from yyFlexLexer that provides
     the above yylex() method, squirrels away lvalp and parm into member
     variables, and then invokes yyFlexLexer::yylex() to do the regular scanning.
     
     		Vern