Function resize

include/boost/asio/basic_file.hpp:831–836

Alter the size of the file. * This function resizes the file to the specified size, in bytes. If the * current file size exceeds @c n then any extra data is discarded. If the * current size is less than @c n then the file is extended and filled with * zeroes. * * @param n The new size for the file. * * @throws boost::system::system_error Thrown on failure. */

   * @throws boost::system::system_error Thrown on failure.
   */
  void resize(uint64_t n)
  {
    boost::system::error_code ec;
    impl_.get_service().resize(impl_.get_implementation(), n, ec);
    boost::asio::detail::throw_error(ec, "resize");
  }

  /// Alter the size of the file.
  /**