Re: [Boost-users] commandline args

Subject: Re: [Boost-users] commandline args
From: OvermindDL1 (overminddl1_at_[hidden])
Date: 2009-08-23 20:36:13

On Sun, Aug 23, 2009 at 5:48 PM, Shaolin<shaolinfinest_at_[hidden]> wrote:
> Ok, so how do I print the results ?
>
> 2009/8/23 Steven Watanabe <watanabesj_at_[hidden]>
>>
>> AMDG
>>
>> Shaolin wrote:
>>>
>>> I have constructed some code but am getting some errors. I am trying to
>>> use
>>> a vector to hold several values but everytime I execute it I get a page
>>> worth of errors. Code below:
>>>
>>> po::options_description desc("Available Options");
>>> desc.add_options()
>>>    ("file", po::value< vector<string> >(), "specify files to search")
>>> ;
>>>
>>> po::variables_map vm;
>>> po::store(po::parse_command_line(ac, av, desc), vm);
>>> po::notify(vm);
>>>
>>> if (vm.count("file")) {
>>>    cout << "Files selected: " << vm["file"].as< vector<string> >() <<
>>> "\n";
>>> } else {
>>>    cout << "No Files selected.\n";
>>> }
>>>
>>> The error is being caused by the following line:
>>>
>>> cout << "Files selected: " << vm["file"].as< vector<string> >() << "\n";
>>>
>>
>> The standard library doesn't provide output operators
>> for containers.

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";

If you do not know how to do that then you may want to read up on some
C++ tutorials first before you start delving into something as big as
LLVM.

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> >());