</em></dt>
<dd>
- Return whether this object is at the boundary. (Only available if
- the dimension of the object is less than the space dimension.)
+ Return whether this object is at the boundary (if the dimension of
+ the object is less than the space dimension), or one of its faces is
+ at the boundary for cells.
+ </dd>
+
+
+ <dt><em>
+ has_boundary_lines ()
+ </em></dt>
+
+ <dd>
+ Return whether one of the lines bounding this cell is at the
+ boundary. For 1d and 2d this is equivalent to <em>at_boundary</em>,
+ in 3d, there are cases where bounding lines of a hex are at the
+ boundary, while the faces are in the interior. (Only for cell
+ iterators.)
</dd>
</dd>
+ <dt><em>
+ point_inside (point)
+ </em></dt>
+
+ <dd>
+ Return whether the given point is inside this cell, or rather the
+ (bi-, tri-)linearly mapped image of the unit cell with the vertices
+ of this cell. (Only for cell iterators.)
+ </dd>
+
+
<dt><em>
number_of_children ()
</em></dt>