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  1. #include <getopt.h>
  2. #include <cstdlib>
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. void help (char ** argv)
  7. {
  8.   cout << "`" << argv[0] << "` experiments with long options." << endl;
  9. }
  10.  
  11. void parse_args (int argc, char ** argv, int & verbose, int & param)
  12. {
  13.   int c = 0;
  14.   while (1)
  15.   {
  16.     static struct option long_options[] =
  17.       {
  18. 	{"help", no_argument, 0, 'h'},
  19. 	{"verbose", required_argument, 0, 'v'},
  20. 	{"param", required_argument, 0, 0}
  21.       };
  22.     int option_index = 0;
  23.     c = getopt_long (argc, argv, "hv:",
  24. 		     long_options, &option_index);
  25.     cout << "c=" << c << endl;
  26.     if (c == -1)
  27.       break;
  28.     switch (c)
  29.     {
  30.     case 0:
  31.       if (long_options[option_index].flag != 0)
  32. 	break;
  33.       printf ("option %s", long_options[option_index].name);
  34.       if (optarg)
  35. 	printf (" with arg %s", optarg);
  36.       printf ("\n");
  37.       break;
  38.     case 'h':
  39.       help (argv);
  40.       exit (0);
  41.     case 'v':
  42.       verbose = atoi(optarg);
  43.       break;
  44.     case 'param':
  45.       param = atoi(optarg);
  46.       break;
  47.     case '?':
  48.       abort ();
  49.     default:
  50.       abort ();
  51.     }
  52.   }
  53. }
  54.  
  55. int main (int argc, char ** argv)
  56. {
  57.   int verbose = 0;
  58.   int param = 0;
  59.   parse_args (argc, argv, verbose, param);
  60.   cout << "verbose=" << verbose << " param=" << param << endl;
  61.   return EXIT_SUCCESS;
  62. }
  63.  
Success #stdin #stdout 0.01s 2728KB
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stdin
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-v 2
stdout
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c=-1
verbose=0 param=0
https://ideone.com/yllaO
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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