#include <limits.h>/* This parses an option string, much like getopt() Usage: OptionParser o("-v -y", "vy"); String args; int c;  while ((c = o.nextOption(args))) switch (c) { case 'v':   case 'y':  default: print ("Unknown option: %c\n", c); } printf ("Leftover options: %s\n", (const char *) args);  */class OptionParser{public:    OptionParser(const char *_s, const char *_options);    int nextOption(String &args);    // result codes    static const int invalidOption = -1;    private:    String s;    String options;    typedef enum {optionNotSet, noArgument, optionalArgument, requiredArgument} arg_t;    arg_t option_table[UCHAR_MAX+1];};