Hello, consider this code snippet written in C++:

const int id_input_file_option = 1;
const int id_output_file_option = 2;

const option long_options[] =
{
{"input-file", 1, NULL, id_input_file_option},
{"output-file", 1, NULL, id_output_file_option},
{NULL, 0, NULL, 0}
};

const char* const short_options = "";
int c = 0;

bool input_file_option_found = false;
bool output_file_option_found = false;

while((c = getopt_long(argc,
argv,
short_options,
long_options,
NULL)) != -1)
{
if(c == id_input_file_option)
{
input_file_option_found = true;

input_file = optarg;
}
else if(c == id_output_file_option)
{
output_file_option_found = true;

output_file = optarg;
}
else if(c == '?')
{
throw runtime_error("Unknown option encountered.");
}
else /* Not reached? */
{
throw runtime_error("Unknown error in getopt_long().");
}
}

As you can see in my options-array, has_arg equals 1 for the "output file"
option, meaning that that option requires a value. I thought that meant that
I had to do
--output-file=something or I would get a runtime error, but it turns out
that getopt_long accepts --output-file=. So I have to do a strlen on optarg
to make sure a value really was specified after the = ?

/ WP

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