Re: [Boost-users] commandline args

Subject: Re: [Boost-users] commandline args
From: Diederick C. Niehorster (dcnieho_at_[hidden])
Date: 2009-08-23 23:05:53

Hi Overmind,

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?

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

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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