-memcached_callback_get() return the function or structure that was provided.
-Upon error, nothing is set, null is returned, and the memcached_return_t
-argument is set to MEMCACHED_FAILURE.
+:c:func:`memcached_callback_get()` return the function or structure that was
+provided. Upon error, nothing is set, null is returned, and the
+:c:type:`memcached_return_t` argument is set to :c:type:`MEMCACHED_FAILURE`.