Re: [Boost-users] commandline args

Oops, the situation is not as bad as i noted in my last message, bk::generate(ostream_iterator<char>(cout), "Command line options not recognized:\n" << (" \"" << ba::string % ("\"" << bk::eol)) << "\"" << bk::eol, vsUnrecog); Does almost what it should, except the prefix is only diplayed for the first item in the list (it thus doesn't seem to belong to the list. Output wanted: Options not recognized: "dd" "-e" "rrty" Output got: Options not recognized: "dd" -e" rrty" It seems unneccesarily complex though, and I have to put "\"" << bk::eol in the code twice, is that really necessary? Thank you for your time, Best, Diederick On Mon, Aug 24, 2009 at 12:03 PM, Diederick C. Niehorster wrote:

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::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 wrote:

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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 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).

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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

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Best, Dee

On Mon, Aug 24, 2009 at 10:42 AM, OvermindDL1 wrote:

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On Sun, Aug 23, 2009 at 8:20 PM, Diederick C. Niehorster wrote:

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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";

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Consequently, if you have Boost trunk installed, then you could do this as well since it does support streaming vectors: #include 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 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@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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