Bison and doesn't name a type error

Question

I have the following files:

CP.h

#ifndef CP_H_
#define CP_H_

class CP {
public:
        enum Cardinalite {VIDE = '\0', PTINT = '?', AST = '*', PLUS = '+'};

        CP(Cardinalite myCard);
        virtual ~CP();
private:
        Cardinalite card;
};

#endif /* CP_H_ */

And dtd.y

%{

using namespace std;
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include "AnalyseurDTD/DtdDocument.h"
#include "AnalyseurDTD/CP.h"

void yyerror(char *msg);
int yywrap(void);
int yylex(void);

DtdDocument * doc = new DtdDocument();
%}

%union { 
        char *s;
        DtdElement * dtdelt;
        CP *cpt;
        CP::Cardinalite card;
}

And the following strange error:

AnalyseurDTD/dtd.y:20:2: error: ‘CP’ does not name a type
AnalyseurDTD/dtd.y:21:2: error: ‘CP’ does not name a type

The stange thing is that if I put CP *cpt; after DtdDocument * doc = new DtdDocument(); I have no error :/

Answer 1

Include the header in your scanner file before you include *.tab.h

// scanner.l file

%{
#include "myheader.h" 
#include "yacc.tab.h"

// other C/C++ code

%}

// helper definitions

%%

// scanner rules 

%%

%union is defined in yacc.tab.h so when you compile you need to make sure the compiler sees your new type definitions before it process yacc.tab.h

Answer 2

Recently I am working with flex and bison. There are several advises that may be helpful for you to locate the problem:

1. Compile the files one by one to make sure there is no obvious compiling error in your code.
2. Check the header file generated by bison (something like *.tab.h). Find the definition of YYSTYPE. There is a high probability that it doesn't include your header file AnalyseurDTD/CP.h.
3. If it's just the case, you should always include AnalyseurDTD/CP.h before you include the *.tab.h. Add it wherever needed to make sure the class CP is defined before YYSTYPE.
4. If you still cannot locate the problem, try use void *cpt; in the union, then add type conversion in the rest of your code.