Re: [Boost-users] [SPIRIT] Problem with actors

From: Stefan Slapeta (stefan_at_[hidden])
Date: 2005-08-23 09:35:55

Stephen Henry wrote:

> Hi all,
> 
> I am having a problem with the following snippet of code. What I want to
> do is parse a line of alpha numeric characters from a file_iterator and
> then use the read characters to construct a new object which takes a
> std::string and integer argument for it's constructor. To do this I am
> using the statement below:
> 
> p >> (+alpha_p)[ create_dfa( self.m_dfa, construct_<DFA>(
> construct_<std::string>( arg1 ), var(500) ) ) ];
> 

First of all, please post questions about spirit to 
gmane.comp.parsers.spirit.general!

You forgot to make self.m_dfa lazy:

p >> (+alpha_p)
      [
         create_dfa( var(self.m_dfa), // <---
                     construct_<DFA>(
                         construct_<std::string>( arg1 ), var(500)
                   ))
      ];

> This is the code I've got:

[...]

> 	Script_parser p(vDFA);
> 	parser_info<iterator_t> info = parse( first, last, p );

This must be parse_info!

> This doesn't even compile, and I have absolutely no idea why. All the
> compiler shows is pages and pages of garbage that means absolutely
> nothing. Please help!
> 

I guess you have never really seen a compiler printing pages and pages...

Cheers,

Stefan