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    <p>Here is complete program as per rcollyer and Tim, whom the credits go to:</p> <pre><code>#include &lt;boost/program_options.hpp&gt; #include &lt;iostream&gt; #include &lt;sstream&gt; namespace po = boost::program_options; bool process_command_line(int argc, char** argv, std::string&amp; host, std::string&amp; port, std::string&amp; configDir) { int iport; try { po::options_description desc("Program Usage", 1024, 512); desc.add_options() ("help", "produce help message") ("host,h", po::value&lt;std::string&gt;(&amp;host)-&gt;required(), "set the host server") ("port,p", po::value&lt;int&gt;(&amp;iport)-&gt;required(), "set the server port") ("config,c", po::value&lt;std::string&gt;(&amp;configDir)-&gt;required(), "set the config path") ; po::variables_map vm; po::store(po::parse_command_line(argc, argv, desc), vm); if (vm.count("help")) { std::cout &lt;&lt; desc &lt;&lt; "\n"; return false; } // There must be an easy way to handle the relationship between the // option "help" and "host"-"port"-"config" // Yes, the magic is putting the po::notify after "help" option check po::notify(vm); } catch(std::exception&amp; e) { std::cerr &lt;&lt; "Error: " &lt;&lt; e.what() &lt;&lt; "\n"; return false; } catch(...) { std::cerr &lt;&lt; "Unknown error!" &lt;&lt; "\n"; return false; } std::stringstream ss; ss &lt;&lt; iport; port = ss.str(); return true; } int main(int argc, char** argv) { std::string host; std::string port; std::string configDir; bool result = process_command_line(argc, argv, host, port, configDir); if (!result) return 1; // else std::cout &lt;&lt; "host:\t" &lt;&lt; host &lt;&lt; "\n"; std::cout &lt;&lt; "port:\t" &lt;&lt; port &lt;&lt; "\n"; std::cout &lt;&lt; "config:\t" &lt;&lt; configDir &lt;&lt; "\n"; // Do the main routine here } /* Sample output: C:\Documents and Settings\plee\My Documents\Visual Studio 2010\Projects\VCLearning\Debug&gt;boost.exe --help Program Usage: --help produce help message -h [ --host ] arg set the host server -p [ --port ] arg set the server port -c [ --config ] arg set the config path C:\Documents and Settings\plee\My Documents\Visual Studio 2010\Projects\VCLearning\Debug&gt;boost.exe Error: missing required option config C:\Documents and Settings\plee\My Documents\Visual Studio 2010\Projects\VCLearning\Debug&gt;boost.exe --host localhost Error: missing required option config C:\Documents and Settings\plee\My Documents\Visual Studio 2010\Projects\VCLearning\Debug&gt;boost.exe --config . Error: missing required option host C:\Documents and Settings\plee\My Documents\Visual Studio 2010\Projects\VCLearning\Debug&gt;boost.exe --config . --help Program Usage: --help produce help message -h [ --host ] arg set the host server -p [ --port ] arg set the server port -c [ --config ] arg set the config path C:\Documents and Settings\plee\My Documents\Visual Studio 2010\Projects\VCLearning\Debug&gt;boost.exe --host 127.0.0.1 --port 31528 --config . host: 127.0.0.1 port: 31528 config: . C:\Documents and Settings\plee\My Documents\Visual Studio 2010\Projects\VCLearning\Debug&gt;boost.exe -h 127.0.0.1 -p 31528 -c . host: 127.0.0.1 port: 31528 config: . */ </code></pre>
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    1. PORequired and Optional Arguments Using Boost Library Program Options
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    1. COYou should catch `boost::program_options::required_option` so that you can handle the lack of a required option directly instead of having it caught by `std::exception`.
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      1. USrcollyer
    2. COPort should be of type unsigned.
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