[boost] Spirit, semantic actions and C++ classes

Subject: [boost] Spirit, semantic actions and C++ classes
From: Claudio La Rosa (clros_at_[hidden])
Date: 2009-03-01 01:31:55

I am writing a class that implements a simple parser.

In the costructor I created the rule and the parser...and I recall the
functions for the semantic actions.
I have implemented this function as member funcions and, for recalled it, I
use a pointer to my member function in this manner:

#include <boost/spirit.hpp>
using namespace boost::spirit;

class MYParser
{
 private:
  //main rules
  rule<const char*> rLine, rComment;
  
  //This are the “semantic action”
  void AnnounceComment(char const*, char const*);

  // ...and this is the pointer to my “semantic action”
  void (SQLParser::*ptrAnnounceComment)(char const*, char const*);

 public:
   MYParser(void);
  //distuttore
  Í  MYParser();
};

MYParser::MYParser()
{
  //(SQLParser::*ptrAnnounceComment)();// = &SQLParser::AnnounceComment;
  //AnnounceComment is my Member functions
  ptrAnnounceComment=&SQLParser::AnnounceComment;

  //make the parser
  rLine = rComment;

 rSpazi = *space_p;
 rTerminal = !ch_p(';');
 
 //commento SQL fino a fine riga
 rComment = str_p("#") >> (*anychar_p)[ this->*ptrAnnounceComment ];

 //...
}
I obtain an error:

“no match for ‘operator[]’ in ‘boost::spirit::operator* [with S =
boost::spirit::anychar_parser](((const
boost::spirit::parser<boost::spirit::anychar_parser>&)((const
boost::spirit::parser<boost::spirit::anychar_parser>*)(&
boost::spirit::anychar_p))))[((SQLParser*)this)->*((SQLParser*)this)->SQLParser::ptrAnnounceComment]’”

on the line:

rComment = str_p("#") >> (*anychar_p)[ this->*ptrAnnounceComment ];

But..why?

I have only a little experience with C++ and spirit :-(

Ciao
Claudio

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