lass="p">(</span><span class="n">x_coord_t</span> <span class="n">width</span><span class="p">)</span> <span class="k">const</span><span class="p">;</span>
  <span class="n">y_coord_t</span> <span class="n">Loc</span><span class="o">::</span><span class="n">y_distance_to</span><span class="p">(</span><span class="k">const</span> <span class="n">Loc</span><span class="o">&amp;</span> <span class="n">loc2</span><span class="p">,</span> <span class="n">x_coord_t</span> <span class="n">x_diff</span><span class=