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Flex Error Redefinition Yyflexlexer


Discussion John43 - 2006-02-15 Logged In: YES user_id=335409 This macro is required for using multiple C++ scanners. To indicate end-of-input, return 0 characters. Please don't fill out this field. The second class defined in `FlexLexer.h' is yyFlexLexer, which is derived from FlexLexer. his comment is here

The comments in the FlexLexer.h include file mention using what is in the bug report for multiple instances and includes. Note that you must build the scanner using `%option debug' to include debugging information in it. `int debug() const' returns the current setting of the debugging flag. Click here follow the steps to fix Flex Error Redefinition Yyflexlexer and related errors. If not specified, the streams default to cin and cout, respectively. `virtual int yylex()' performs the same role is `yylex()' does for ordinary flex scanners: it scans the input stream, consuming

Flex C++ Tutorial

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Looking at the link you provided, I wonder if you need to remove the FlexLexer.h include since you have only the one parser. Search the comp.compilers archives again. IMPORTANT: the present form of the scanning class is experimental and may change considerably between major releases. Scanner Java Browse other questions tagged c++ flex-lexer or ask your own question.

I could not compile my scanner.cpp file because the compiler said: /usr/include/FlexLexer.h:113: error: redefinition of 'class yyFlexLexer' /usr/include/FlexLexer.h:113: error: previous definition of 'class yyFlexLexer' So what I did was to write Bison C++ You then can include `' in your other sources once per lexer class, first renaming yyFlexLexer as follows: #undef yyFlexLexer #define yyFlexLexer xxFlexLexer #include #undef yyFlexLexer #define yyFlexLexer zzFlexLexer #include Log in with Facebook Log in with Twitter Your name or email address: Do you already have an account? http://stackoverflow.com/questions/11939584/overloading-yylex-using-flexlexer-in-c Here is the body part of readsjt.y: main() { parser MyParser; MyParser.yyparse(); } Not very complicated, is it?

However, my program won't build from scratch, the scanner classes produce errors: #pragma once #if ! int yylex(FLEXFIX, istream* new_in, ostream* new_out = 0 ) { switch_streams( new_in, new_out ); return yylex(FLEXFIX2); } However other versions of the file such as https://www.w3.org/2008/04/SPARQLfed/win/FlexLexer.h do not. You should not encounter any compilations errors (please report any you find to the email address given in the Author section below). Shortest code to throw SIGILL What danger/code violation is oversized breakers?

Bison C++

Maybe the problem is caused by some (bad?) hack I did. https://ftp.gnu.org/old-gnu/Manuals/flex-2.5.4/html_node/flex_19.html Join flex-devel if the mechanics of such a thing interest you. Flex C++ Tutorial However, I get compile errors as a result because of symbol redefinition. Flexc++ I do not know what to do.

I am having a problem with using Flex++. http://bigvideogamereviewer.com/flex-error/flex-error-loading-jvm-dll.html If you would like to refer to this comment somewhere else in this project, copy and paste the following link: John43 - 2006-02-15 status: open --> open-postponed If you would Can anyone send me .l and .y files to use with bison++ and flex++ as examples. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Yylex

virtual int yylex() = 0; // Call yylex with new input/output sources. tokenizer.l (tokenizer.cc) and ClassParser.cc both include this header indirectly, and in separate compilation they work fine; but when compiling concatenated source, a "#define yyFlexLexer yyFlexLexer" declaration (inserted by flex) carries through Thanks in advance for your help Answers rici February 2016 You shouldn't be fooling around with yyFlexLexerOnce. weblink The temptation would be to put these declarations in the

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The .L and the Makefile are quite small and I could post them if it would help.

Sign up for the SourceForge newsletter: I agree to receive quotes, newsletters and other information from sourceforge.net and its partners regarding IT services and products. defined(yyFlexLexerOnce) #define yyFlexLexer spFlexLexer #include #undef yyFlexLexer #endif #include "split_pattern_parser.h" namespace SP { class SP_Scanner : public spFlexLexer { ... } I get this error : error: expected class-name before Thank you in advance, c++ flex-lexer share|improve this question edited May 6 '13 at 20:53 Jonathan Leffler 446k62519833 asked Mar 4 '11 at 8:10 Javier J. There are actually several different versions of the FlexLexer.h file, some with the FLEXFIX argument and some without. –Richard Chambers Jun 25 at 13:19 add a comment| Your Answer draft

Actualy this is the first time. The above files don't include #undef yyFlexLexer and #define yyFlexLexer ... Coding standard for clarity: comment every line of code? http://bigvideogamereviewer.com/flex-error/flex-errors.html Unfortunately, I got the following errors: /usr/include/FlexLexer.h:103: error: redefinition of ‘class zzFlexLexer’ /usr/include/FlexLexer.h:103: error: previous definition of ‘class zzFlexLexer’ This error also appears even when I have only one Lexer...

PPS.: I am also quite new to coding C++, so it would be very kind if you could explain your solution as if I was just 5 years old... :-) reply If you would like to refer to this comment somewhere else in this project, copy and paste the following link: Will Estes - 2007-03-07 assigned_to: nobody --> wlestes summary: redefinition of num2 [-+]?{dig}*\.{dig}+([eE][-+]?{dig}+)? You can then use C++ code in your rule actions instead of C code.

It looks to me as if there were two "#include " directives hanging around and not properly protected with "#ifndef yyFlexLexer" directives in the .h file. help-flex [Top][All Lists] Advanced [Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] flex++: Using yylval From: Christoph B. Note the comments on redefinitions necessary to use multiple c++ scanners in the manual or in FlexLexer.h. What to do when you are asked to perform an official review for a journal of a manuscript written by your supervisor?