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,

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

-- Warm regards , Vivek, (¨`·.·´¨) Always `·.¸(¨`·.·´¨) Keep Smiling (¨`·.·´¨)¸.·´ N Be Happy!! `·.¸.·´

Thanks Tarcisio, This worked for me. On Thu, Aug 22, 2013 at 9:06 PM, Tarcisio Fedrizzi wrote:

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,

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

-- Warm regards , Vivek, (¨`·.·´¨) Always `·.¸(¨`·.·´¨) Keep Smiling (¨`·.·´¨)¸.·´ N Be Happy!! `·.¸.·´ _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

-- Warm regards , Vivek, (¨`·.·´¨) Always `·.¸(¨`·.·´¨) Keep Smiling (¨`·.·´¨)¸.·´ N Be Happy!! `·.¸.·´