At 10:14 AM 12/19/2004, you wrote: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).
Did you look at the warning you get from the line in question?
warning: unreachable code at beginning of switch statement
Lol, of course! It's not reachable...I should've seen that. Anyway, I always compile with -Wall -W -ansi -pedantic and my homebrewn gcc-3.4.3 didn't yield any warnings at all.
Thanks for the help, Larry! One question answered. I'm still wondering about the return values of getopt_long(), though, and I will try the same code on Fedora as soon as I get it setup properly on my laptop.
/ Mikael
-- Larry Hall http://www.rfk.com RFK Partners, Inc. (508) 893-9779 - RFK Office 838 Washington Street (508) 893-9889 - FAX Holliston, MA 01746
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