Re: [Boost-users] Boost program option parsing issue.

Subject: Re: [Boost-users] Boost program option parsing issue.
From: Tarcisio Fedrizzi (tarcisio.fedrizzi_at_[hidden])
Date: 2013-08-22 08:28:47

Hi,
why would you need to run the program with --input-file without a value?

If you want to set the inputFile variable to a default value if it is not
specified
on the command line simply assign it where you declare the variable.
Alternatively
you can assign the variable like this:

if (vm.count("input-file")) {
...
} else {
  inputFile = "whatever";
}

Best regards,
Tarcisio Fedrizzi

On Mon, Aug 19, 2013 at 6:46 PM, Vivek Anand <vickywindwin_at_[hidden]> wrote:

> Hi All,
>
> I am using program option for my program. Here is my code snippet
>
>  string inputFile, outputFile;
>
> /* Populate command line arguments */
>     po::options_description desc("Usage: KDMGenerator [OPTIONS]");
>     {
>         desc.add_options()
>             ("help", "prints this message")
>             ( "input-file", po::value<string>(&inputFile), "input file
> name" )
>             ( "output-file", po::value<string>(&outputFile), "output file
> name");
>     }
>
>     po::variables_map vm;
>     po::store(po::parse_command_line(argc, argv, desc), vm);
>     po::notify(vm);
>
>     if (vm.count("help") || !vm.size())
>     {
>         cout <<desc;
>         return 0;
>     }
>
>     if(vm.count("input-file"))
>     {
>         cout << "Input file :" << inputFile << '\n';
>     }
>
>     if(vm.count("output-file"))
>     {
>         cout << outputFile << '\n';
>     }
>
>
> The issue I am facing is that if i I call my program without passing value
> for input file, something like
>
> ./myapp --input-file --output-file out.txt
>
> I get Input file: --output-file
>
>
> i.e the value "--output-file" get stored in inputFile and
> vm.count("output-file") returns zero.
>
> Is this the desired behavior? Is there any workaround for this?
>
> --
> Vivek,
>
>
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>