SOLID: Sensor Has ID
====================

Consider the following ``Sensor`` hierarchy (and imagine that there
are many more implementations like ``W1Sensor`` out there that
implement the ``Sensor`` interface).

.. literalinclude:: q-solid--sensor-with-id/sensor.h
   :language: c++

.. literalinclude:: q-solid--sensor-with-id/sensor-w1.h
   :language: c++

Here is a sampe usage of the ``W1Sensor`` class.

.. literalinclude:: q-solid--sensor-with-id/sensor-with-id-main.cpp
   :language: c++

Obviously the ``id`` attribute of a sensor remains unused in most
situations.

Which of the five SOLID principles are violated? Which are not? Comment!

.. list-table::
   :align: left
   :widths: 10 50 50
   :header-rows: 1

   * * Principle
     * Why violated?
     * Why not?
   * * Single Responsibility
     *
     *
   * * Open/Closed
     * 
     *
   * * Liskov Substitution
     *
     *
   * * Interface Segregation
     *
     *
   * * Dependency Inversion
     *
     *