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

22 Aug 2013

      Hi,
this does the trick:

( "input-file", po::value<string>(&inputFile)->implicit_value(""), "input
file name" )

note the implcit_value call added.
In this way the parse works as you need.

Best regards,
Tarcisio Fedrizzi

On Thu, Aug 22, 2013 at 3:58 PM, Vivek Anand  wrote:
...
On Thu, Aug 22, 2013 at 5:58 PM, Tarcisio Fedrizzi
 wrote:
...
Hi,
why would you need to run the program with --input-file without a value?
A third-party client will be using my program through a script or
through exec(). I do not have control over that code.
Currently, my validation check throws error that output-file not
specified. Actually its the input file which is missing.
...
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 
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 <
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,
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--
Warm regards ,
Vivek,
(¨`·.·´¨) Always
`·.¸(¨`·.·´¨) Keep Smiling
(¨`·.·´¨)¸.·´ N Be Happy!!
`·.¸.·´
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