Check for configuration

sqlproxy.cpp

@@ -1,37 +1,40 @@
 #include <iostream>
 #include <boost/program_options.hpp>
 
+
 namespace {
     namespace po = boost::program_options;
 
     void init_all(int argc, char **argv) {
         po::options_description desc("SQLProxy command line options");
+        std::string config;
         desc.add_options()
             ("help,h", "show help message")
-            // ("config,c", po::value<std::string>(&config)->required(), "path to configuration")
-            ("config,c", "path to configuration")
+            ("config,c", po::value<std::string>(&config)->required(), "path to configuration")
         ;
 
         auto options = po::command_line_parser(argc, argv).options(desc).run();
         po::variables_map vm;
         po::store(options, vm);
-        po::notify(vm);
 
         if (vm.count("help")) {
             std::cerr << desc << "\n";
             exit(1);
         }
 
-        if (!vm.count("config")) {
-            std::cerr << "  error: the option '--config' is required but missing\n";
-            exit(1);
-        }
+        po::notify(vm);
 
-        std::string config = vm["config"].as<std::string>();
         std::cout << "configuration: '" << config << "'\n";
     }
 }
 
+
 int main(int argc, char **argv) {
-    init_all(argc, argv);
+    try {
+        init_all(argc, argv);
+    } catch (po::required_option &err) {
+        std::cerr << "  error: " << err.what() << "\n";
+    } catch (std::exception &e) {
+        std::cerr << e.what() << "\n";
+    }
 }