Method IndexOf

library/cpp/getopt/small/last_getopt_opts.cpp:255–260

    }

    size_t TOpts::IndexOf(const TOpt* opt) const {
        TOptsVector::const_iterator it = std::find(Opts_.begin(), Opts_.end(), opt);
        if (it == Opts_.end())
            ythrow TException() << "unknown option";
        return it - Opts_.begin();
    }

    TStringBuf TOpts::GetFreeArgTitle(size_t pos) const {
        if (FreeArgSpecs_.contains(pos)) {