Function validate 

pub fn validate(getopt: getopt) -> Result<getopt>

Validate parsed options in strict mode.

Success

If strict mode validation passes, unchanged argument wrapped in Result is returned.

Errors

Returns Err if option not listed in optstring is encountered or required argument for an option is missing.

Example

use std::env::args;
use getopt3::hideBin;

let rc = getopt3::new(hideBin(args()), "ab:c");
if let Ok(g) = rc {
   // command line parsed sucessfully
   // validate options for missing arguments
   if let Ok(g) = getopt3::validate(g) {
      // command arguments are valid, we can use them
      if let Some(_) = g.get('b') {
         // -a option found on command line
      };
   };
 };