Re: [Boost-users] commandline args

Subject: Re: [Boost-users] commandline args
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2009-08-23 23:21:37

> Really? Thank you for that tip! That brings me to a few questions (I
> was just testing it and couldn't get it to work quickly). What is the
> sink? I think i can just replace that with cout, right? Actually, no,
> that gets me an compile error
> "boost/spirit/home/karma/detail/output_iterator.hpp(295) : error
> C2675: unary '++' : 'std::ostream' does not define this operator or a
> conversion to a type acceptable to the predefined operator".
> 
> ok, what i got now is:
> 
> #include <boost/spirit/include/karma.hpp>
> namespace bk  = boost::spirit::karma;
> namespace ba  = boost::spirit::ascii;
> vector<string> vsUnrecog =
> collect_unrecognized(parsed.options,po::exclude_positional);
> bk::generate(cout, "Option \"" << ba::string % '\" not recognized' <<
> bk::eol, vsUnrecog);
> 
> Where do those sinks come from and how do I make a simple sink that
> writes to stdout, just like cout does?

I used 'sink' as a placeholder for any output iterator, so in your case the easiest is to construct an ostream_iterator<char>(cout).

> By the way, doen't your code both use ";" and newline (eol) as
> delimiters?

';' is used as the delimiter in between the elements of the vector (string % ';': in Spirit operator% is used as the shortcut for 'list'), and eol is used as the closing newline.

Regards Hartmut

> 
> Best,
> Dee
> 
> 
> On Mon, Aug 24, 2009 at 10:42 AM, OvermindDL1<overminddl1_at_[hidden]>
> wrote:
> > On Sun, Aug 23, 2009 at 8:20 PM, Diederick C.
> > Niehorster<dcnieho_at_[hidden]> wrote:
> >>> The same way that you would stream any normal vector:
> >>> vector<string> &files = vm["file"].as< vector<string> >();
> >>> vector<string>::const_iterator iter = files.begin();
> >>> cout << "Files selected: ";
> >>> for(;iter!=files.end();++iter)
> >>> {
> >>>    cout << *iter << ";";
> >>> }
> >>> cout << "\n";
> >>>
> >>
> >>> Consequently, if you have Boost trunk installed, then you could do
> >>> this as well since it does support streaming vectors:
> >>> #include <boost/spirit/include/karma.hpp>
> >>> using namespace boost::spirit::karma;
> >>> using namespace boost::spirit::ascii;
> >>>
> >>> generate(cout, "Files selected: " << (*char_)%';' << eol,
> >>> vm["file"].as< vector<string> >());
> >>
> >> Or you could simply do:
> >> #include <boost/foreach.hpp>
> >> cout << "Files selected: ";
> >> BOOST_FOREACH(string& sFile, vm["file"].as< vector<string> >())
> >>            cout << sFile.c_str() << endl;
> >
> > That is assuming you wanted an endl at the end of each name, a usual
> > delimiter is something like ';' or so, so this instead:
> > cout << "Files selected: ";
> > BOOST_FOREACH(string& sFile, vm["file"].as< vector<string> >())
> >           cout << sFile.c_str() << ";";
> > cout << "\n";
> >
> > Although the karma version that Hartmut posted is still the fastest
> > way to do it (in terms of execution speed):
> > generate(sink,
> >   "Files selected: " << string % ';' << eol,
> >   vm["file"].as< vector<string> >());
> > _______________________________________________
> > Boost-users mailing list
> > Boost-users_at_[hidden]
> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users