4-Connection (2D)
#################

4-connected neighborhood over a 2D grid.


.. figure:: /figures/core/c4.svg
    :alt: 4-connected
    :align: center

    Center and its 4-connected points


.. cpp:class:: c4_t

.. cpp:var:: constexpr c4_t c4

.. rubric:: Properties


+---------------+----------+
|   Property    |          |
+===============+==========+
| Category      | *static* |
+---------------+----------+
| Incremental   |          |
+---------------+----------+
| Decomposabale |          |
+---------------+----------+
| Separable     |          |
+---------------+----------+


.. topic:: See also

    * :doc:`c8`