Function available

include/boost/asio/basic_socket.hpp:748–755

Determine the number of bytes available for reading. * This function is used to determine the number of bytes that may be read * without blocking. * * @return The number of bytes that may be read without blocking, or 0 if an * error occurs. * * @throws boost::system::system_error Thrown on failure. */

   * @throws boost::system::system_error Thrown on failure.
   */
  std::size_t available() const
  {
    boost::system::error_code ec;
    std::size_t s = impl_.get_service().available(
        impl_.get_implementation(), ec);
    boost::asio::detail::throw_error(ec, "available");
    return s;
  }

  /// Determine the number of bytes available for reading.
  /**