e="Class template unit">unit</a></code></span>.
      </p>
<p>
        Let's declare a simple base unit:
      </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">foot_base_unit</span> <span class="special">:</span> <span class="identifier">base_unit</span><span class="special">&lt;</span><span class="identifier">foot_base_unit</span><span class="special">,</span> <span class="identifier">length_dimension</span><span class="special">,</span> <span class="number">10<