Re: [Boost-users] commandline args

Subject: Re: [Boost-users] commandline args
From: Diederick C. Niehorster (dcnieho_at_[hidden])
Date: 2009-08-24 00:03:54

Hi Harmut,

Thank you for the answers. However, I am still having some trouble and
i figure it out following the documentation on the list operator.

I am trying to produce an output like below:
Options not recognized:
  "dd"
  "-e"
  "rrty"

However,
bk::generate(ostream_iterator<char>(cout), "Command line options not
recognized:\n" << ("  \"" << ba::string % "\"" << bk::eol) << bk::eol,
vsUnrecog);

does not do the trick and

bk::generate(ostream_iterator<char>(cout), "Command line options not
recognized:\n" << ("  \"" % ba::string % "\"" << bk::eol) << bk::eol,
vsUnrecog);

fails with "..\Dependency\boost\boost/spirit/home/karma/string/lit.hpp(108)
: error C2664: 'boost::mpl::assertion_failed' : cannot convert
parameter 1 from 'boost::mpl::failed ************(__thiscall
boost::spirit::karma::any_string<CharEncoding,Tag>::generate::string_not_usable_without_attribute::*
***********)(void)' to 'boost::mpl::assert<false>::type'" (which I
guess is not the way it should fail? Shouldnt there be a nice
assertion message or is this it? no experience with it really)

What am I missing here?

Best and thanks,
Dee

On Mon, Aug 24, 2009 at 11:21 AM, Hartmut
Kaiser<hartmut.kaiser_at_[hidden]> wrote:
>> 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)
>> >>> {
>> >>> Â  Â 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> >())
>> >> Â  Â  Â  Â  Â  Â 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> >())
>> > Â  Â  Â  Â  Â  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,
>> > Â  "Files selected: " << string % ';' << eol,
>> > Â  vm["file"].as< vector<string> >());
>> > _______________________________________________
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>> > Boost-users_at_[hidden]
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>> >
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