an class="n">y_coord_t</span><span class="p">);</span>
  <span class="n">cached_location_t</span> <span class="n">Loc</span><span class="o">::</span><span class="n">cache_location</span><span class="p">(</span><span class="n">x_coord_t</span><span class="p">,</span> <span class="n">y_coord_t</span><span class="p">)</span> <span class="k">const</span><span class="p">;</span>

  <span class="kt">bool</span>      <span class="n">Loc</span><span class="o">::</span><span class="n">is_1d_traversable</span><span c