lex/yacc with c++...... HELP!!!

[deepusrp]

Helo everyone,

i am doing a project on some graphic tool using qt as
the front end. i am using lex and yacc as parser.
now i am facing a problem since yacc generates only c
code as i want to bring c++ features. so my request
is " is there any way that we can create parser in qt
itself or is there any method by which i can make a
c++ (yacc) Parser... "

please set me know how can i generate c++ parser using yacc

please guide me its urgent...
deepu

[arvindkgs]

Although Lex and YACC predate C++, it is possible to generate a C++ parser. While Flex includes an option to generate a C++ lexer, we won't be using that, as YACC doesn't know how to deal with it directly.
It is possible to make the yacc generate a c++ file, but the lex outputs a c file. so in order for the yacc generated file to recoginize the c functions and variables,
To do so, make a C header in YACC like this:

extern "C"
{
int yyparse(void);
int yylex(void);
int yywrap()
{
return 1;
}

}
if u want to declare or change yydebug then
extern int yydebug;

main()
{
yydebug=1;
yyparse();
}

To compile, do something like this:

lex bindconfig2.l
yacc --verbose --debug -d bindconfig2.y -o bindconfig2.cc
cc -c lex.yy.c -o lex.yy.o
c++ lex.yy.o bindconfig2.cc -o bindconfig2

Because of the -o statement, y.tab.h is now called bindconfig2.hh or
bindconfig2.cc.h, so take that into account.