Subject: Re: [Boost-users] problems with boost::spirit
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-03-16 20:41:18
AMDG
Goran wrote:
> I wanna get boost::spirit to tell me which position in my string is
> liable that parsing fails. Here's a fully compiling demonstration:
>
> #--------------------------------------------------------------------
> #include <iostream>
> #include <string>
> #include <boost/spirit.hpp>
>
> using namespace std;
> using namespace boost::spirit;
>
> int main()
> {
> string s = "#x";
> rule<> r = chlit<>('#') >> chlit<>('X') >> *space_p;
>
> parse_info<> p = parse(s.c_str(),r);
> if(p.full)
> cout << "File is OK:\n";
> else
> cout << "Error at pos " << p.length << ".\n";
>
> return 0;
> }
> #--------------------------------------------------------------------
>
> With this I get:
>
> Error at pos 4294967295.
>
> But if "string s = "#Xx" I get:
>
> Error at pos 2.
>
> This is what I want. But why do I get 4294967295 which is 2^32-1.
>
Parsing fails so there is no match. p.length is therefore not valid.
In Christ,
Steven Watanabe