How do I implement check_type() ?

I am transforming the YACC grammar and LEX specification into a very
simple C++ interpreter. I am only adding classes from C++ to the
grammar referenced below. I parse all of the input source code file
into an Abstract Syntax Tree.


In the case of this project I need to return TYPE_NAME from the lexer
whenever I encounter a Class name. The problem seems to be that only
the parser knows whether or not the IDENTIFIER is a class name or not,
and yet the lexer sees the name before it goes to the parser.


What is the simplest way to get around this problem?


http://www.lysator.liu.se/c/ANSI-C-grammar-y.html
http://www.lysator.liu.se/c/ANSI-C-grammar-l.html


int check_type()
{
/*
* pseudo code --- this is what it should check
*
* if (yytext == type_name)
* return(TYPE_NAME);
*
* return(IDENTIFIER);
*/


/*
* it actually will only return IDENTIFIER
*/


return(IDENTIFIER);
}

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