Method parse

cpp/examples/options.hpp:64–75

Parse the command line, return the index of the first non-option argument. *@throws bad_option if there is a parsing error or unknown option. */

     *@throws bad_option if there is a parsing error or unknown option.
     */
    int parse() {
        int arg = 1;
        for (; arg < argc_ && argv_[arg][0] == '-'; ++arg) {
            opts::iterator i = opts_.begin();
            while (i != opts_.end() && !(*i)->parse(argc_, argv_, arg))
                ++i;
            if (i == opts_.end())
                throw bad_option(std::string("unknown option ") + argv_[arg]);
        }
        if (help_) throw bad_option("");
        return arg;
    }

    /** Print a usage message */
  friend std::ostream& operator<<(std::ostream& os, const options& op) {