Re: [boost] Attibutes and Qi

Subject: Re: [boost] Attibutes and Qi
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2010-08-27 14:03:50

> > I used the classic spirit in the past. Now I want to migrate to Spirit
> > 2.4 but I don't get the things together.Reading the different docus in
> > the web did not help.  What I want to do at first is to parse a simple
> > string into a QString:
> > My pseudo code looks like:
> >
> >    QString t;
> >    qi::rule<string::iterator, QString()> r1 = (+qi::char_)(qi::_val =
> > qi::_1);
> >    qi::rule<string::iterator , void()> r = r1[ref(t) = _1];
> >    std::string temp("Hallo");
> >    phrase_parse(temp.begin(), temp.end(), r, qi::space);
> >
> > But the compiler does no like this. Can anybody help me?
> 
> Please note, I don't know anything about QString. But in order to be
> usable in places where Spirit expects to see a container, any data type
> needs to conform to certain concepts. In particular the type is expected
> to expose a STL compatible insert() function, expose the embedded types
> 'value_type', 'iterator', 'size_type', and 'reference'. IOW, it needs to
> be a STL compatible container.
> 
> If the required interfaces are not exposed, you'll need to specialize
> Spirit's customization points for your data type (see the docs and
> examples for that, for instance:
> http://www.boost.org/doc/libs/1_44_0/libs/spirit/doc/html/spirit/advanced/
> customize/is_container.html).
> 
> If you write such customization points for QString we would love to get
> them back and having it added to the Spirit repository.

For the sake of it I added an example to Spirit
($BOOST_ROOT/libs/spirit/example/qi/custom_string.cpp) showing how to parse
directly into a QString.

HTH
Regards Hartmut

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