Method verify

tests/BS_thread_pool_test.cpp:3943–3950

* @brief Verify that the command line arguments belong to the list of allowed arguments. * * @return `true` if all arguments are allowed, `false` otherwise. */

     * @return `true` if all arguments are allowed, `false` otherwise.
     */
    [[nodiscard]] bool verify() const
    {
        return std::all_of(args.begin(), args.end(),
            [this](const std::string_view arg)
            {
                return allowed.count(arg) == 1;
            });
    }

private:
    struct arg_spec