Hello, consider this c++-function:
void
handle_command_line(int argc,
char* const argv[],
bool& verbose,
vector<string>& numbers)
{
const int id_numbers = 4711;
const int id_verbose = 4712;
const int id_help = 4713; const option long_options[] =
{
{"numbers", 1, NULL, id_numbers},
{"verbose", 0, NULL, id_verbose},
{"help", 0, NULL, id_help},
{NULL, 0, NULL, 0}
};const char* const short_options = "";
int c = 0;
while((c = getopt_long(
argc,
argv,
short_options,
long_options,
NULL)) != -1)
{
switch(c)
{
cout << "c = " << c << endl; /* Never shown on screen... */ case id_numbers:
{
cout << "Calling extract_numbers() with " << optarg << endl;extract_numbers(optarg, numbers);
break;
}
case id_verbose:
{
cout << "Setting verbose = true" << endl;verbose = true;
break;
}
case id_help:
{
cout << "TODO: Add short description regarding usage here." << endl;
exit(EXIT_SUCCESS);
}
/* c seems to equal '?' for missing parameter as well... */
case ':':
{
cerr << "Missing parameter." << endl; break;
}
/* Only triggers for unknown options beginning with -- */
case '?':
{
cerr << "Ignoring unknown option." << endl; break;
}
default:
{
/* Throw exception? */
cerr << "Should not be reached." << endl;
}
}
}
}My first question is about the
cout << "c = " << c << endl;
inside the switch. I never see this output, why? I tried writing the output to a file as well but that file was empty when the program finished. All other "output-statements" are displayed just fine in this function (and the rest of the program).
And my second questions is why does getopt_long() return '?' for the error when an option requires an argument but none was supplied? I thought that it would return ? for unknown option and return : for missing required parameters, but it seems to return ? for both those errors (but it ouputs the correct diagnostic).
I'm using latest offical cygwin, all relevant packages up-to-date. Running fully-updated winxp pro.
Thanks for any replies
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