[Boost-users] [program options] count problem

Subject: [Boost-users] [program options] count problem
From: Olivier Tournaire (olitour_at_[hidden])
Date: 2013-02-02 08:08:06

Hi all,

I am having troubles with program options. I try to test if at least some
of the available options are passed on the command line, but fail for some
reason using count("option_name"). Here is my code:

int main(int argc, char** argv)
{
    string hierarchy;
    vector<string> files, directories;
    double vertical_shift;
    bool show_progress, single_file, single_dir;
    int target_EPSG, nb_threads;

    po::options_description desc("Allowed options");
    desc.add_options()
        ("help
,h"
, "Produce help message")
        ("hierarchy        ",
po::value<string>(&hierarchy)
, "process a hierarchy)
        ("file             ", po::value<vector<string>
>(&files)                                            , "process the
specified files")
        ("directory        ", po::value<vector<string>
>(&directories)                                      , "process the
specified directories");

    po::variables_map vm;
    try
    {
        po::store(po::parse_command_line(argc, argv, desc), vm);

        if (vm.count("help"))
        {
            cout << desc << "\n";
            return 1;
        }

        po::notify(vm);
    }
    catch (const po::error &e)
    {
        cerr << "Exception caught ! --> " << e.what() << endl;
        cout << desc << endl;
        return 1;
    }

    if (vm.count("hierarchy"))
    {
        path input_path(hierarchy);
        // DO STUFF
    }
    else if (vm.count("files"))
    {
        for(unsigned int i=0;i<files.size();++i)
        {
            path input_path(files[i]);
            // DO STUFF
        }
    }
    else if (vm.count("directories"))
    {
        for(unsigned int i=0;i<directories.size();++i)
        {
            path input_path(directories[i]);
            // DO STUFF
        }
    }
    else
    {
        cout << "You must choose an option between --hierarchy --files
--directories!" << endl;
        cout << desc << endl;
        return 1;
    }

I always fall in the "else". What am I doing wrong?

For instance with this command line : ./acute_coordinates_transform
--hierarchy ~/work/data/

À other question: is there à way to specify that 1 of the 3 options is
required (and only 1)?

Hope you cloud help.

Regards,

Olivier