[boost] Antwort: Re: Attibutes and Qi

Subject: [boost] Antwort: Re: Attibutes and Qi
From: Steffen.Roeber_at_[hidden]
Date: 2010-08-30 02:20:12

Thanks your for your answer. It works great. But to complete the example, 
is it also possible to replace the std::string::iterator with 
QString.:Iterator.
The following code:
  QString t2 = "Hallo";
  QString s2;
  qi::rule<QString::iterator, QString()> rule = (+qi::char_);
  qi::rule<QString::iterator> rule2 = rule[phoenix::ref(s2) = qi::_1];
  qi::phrase_parse(t2.begin(), t2.end(), rule2, qi::ascii::space);
does not compile:
1>------ Build started: Project: Spirit 2, Configuration: Debug Win32 
------
1>Compiling...
1>main.cpp
1>using native typeof
1>D:\Devel10\Base\Libraries\boost_1_44_0\boost/spirit/home/support/char_class.hpp(783) 
: error C2440: '<function-style-cast>' : cannot convert from 'const QChar' 
to 'int'
1>        No user-defined-conversion operator available that can perform 
this conversion, or the operator cannot be called
1> 
D:\Devel10\Base\Libraries\boost_1_44_0\boost/spirit/home/support/char_class.hpp(782) 
: while compiling class template member function 'bool 
boost::spirit::traits::ischar<CharParam,CharEncoding>::call(const 
CharParam &)'
1>        with
1>        [
1>            CharParam=QChar,
1>            CharEncoding=boost::spirit::char_encoding::ascii
1>        ]
1> 
D:\Devel10\Base\Libraries\boost_1_44_0\boost/spirit/home/qi/char/char_class.hpp(68) 
: see reference to class template instantiation 
'boost::spirit::traits::ischar<CharParam,CharEncoding>' being compiled
1>        with
1>        [
1>            CharParam=QChar,
1>            CharEncoding=boost::spirit::char_encoding::ascii
1>        ]
1> 
D:\Devel10\Base\Libraries\boost_1_44_0\boost/spirit/home/qi/char/char_parser.hpp(68) 
: see reference to function template instantiation 'bool 
boost::spirit::qi::char_class<Tag>::test<QChar,Context>(CharParam,Context 
&) const' being compiled
1>        with
1>        [
1> 
Tag=boost::spirit::tag::char_code<boost::spirit::tag::space,boost::spirit::char_encoding::ascii>,
1>            Context=const boost::fusion::unused_type,
1>            CharParam=QChar
1>        ]
1> 
D:\Devel10\Base\Libraries\boost_1_44_0\boost/spirit/home/qi/skip_over.hpp(27) 
: see reference to function template instantiation 'bool 
boost::spirit::qi::char_parser<Derived,Char>::parse<Iterator,const 
boost::fusion::unused_type,boost::fusion::unused_type,const 
boost::fusion::unused_type>(Iterator &,const Iterator &,Context &,const 
Skipper &,Attribute &) const' being compiled
1>        with
1>        [
1> 
Derived=boost::spirit::qi::char_class<boost::spirit::tag::char_code<boost::spirit::tag::space,boost::spirit::char_encoding::ascii>>,
1>            Char=boost::spirit::char_encoding::ascii::char_type,
1>            Iterator=QString::iterator,
1>            Context=const boost::fusion::unused_type,
1>            Skipper=boost::fusion::unused_type,
1>            Attribute=const boost::fusion::unused_type
1>        ]
1> 
D:\Devel10\Base\Libraries\boost_1_44_0\boost/spirit/home/qi/detail/parse.hpp(89) 
: see reference to function template instantiation 'void 
boost::spirit::qi::skip_over<Iterator,skipper_type>(Iterator &,const 
Iterator &,const T &)' being compiled
1>        with
1>        [
1>            Iterator=QString::iterator,
1>            T=skipper_type
1>        ]
1> 
D:\Devel10\Base\Libraries\boost_1_44_0\boost/spirit/home/qi/parse.hpp(100) 
: see reference to function template instantiation 'bool 
boost::spirit::qi::detail::phrase_parse_impl<Expr>::call<Iterator,Skipper>(Iterator 
&,Iterator,const Expr &,const Skipper 
&,boost::spirit::qi::skip_flag::enum_type)' being compiled
1>        with
1>        [
1>            Expr=boost::spirit::qi::rule<QString::iterator>,
1>            Iterator=QString::iterator,
1>            Skipper=boost::spirit::ascii::space_type
1>        ]
1> 
D:\Devel10\Base\Libraries\boost_1_44_0\boost/spirit/home/qi/parse.hpp(113) 
: see reference to function template instantiation 'bool 
boost::spirit::qi::phrase_parse<QString::iterator,boost::spirit::qi::rule<Iterator>,boost::spirit::ascii::space_type>(Iterator 
&,Iterator,const Expr &,const Skipper 
&,boost::spirit::qi::skip_flag::enum_type)' being compiled
1>        with
1>        [
1>            Iterator=QString::iterator,
1>            Expr=boost::spirit::qi::rule<QString::iterator>,
1>            Skipper=boost::spirit::ascii::space_type
1>        ]
1>        .\main.cpp(48) : see reference to function template 
instantiation 'bool 
boost::spirit::qi::phrase_parse<QString::iterator,boost::spirit::qi::rule<Iterator>,boost::spirit::ascii::space_type>(const 
Iterator &,Iterator,const Expr &,const Skipper 
&,boost::spirit::qi::skip_flag::enum_type)' being compiled
1>        with
1>        [
1>            Iterator=QString::iterator,
1>            Expr=boost::spirit::qi::rule<QString::iterator>,
1>            Skipper=boost::spirit::ascii::space_type
1>        ]
1>Build Time 0:07
1>Build log was saved at "file://c:\Dokumente und Einstellungen\str\Eigene 
Dateien\Visual Studio 2005\Projects\Spirit 2.0 Test\Spirit 2.0 
Test\Debug\BuildLog.htm"
1>Spirit 2 - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped 
==========

It seems that spirit tries to convert a QChar into a int. Is there any 
template I have to specialize?

Hella Aglaia Mobile Vision GmbH
Steffen Roeber
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( 
Gesendet von: boost-bounces_at_[hidden]
27.08.2010 20:03
Bitte antworten an
boost_at_[hidden]

An
<boost_at_[hidden]>
Kopie

Thema
Re: [boost] Attibutes and Qi

> > 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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