--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+sbp/InterpOps.m	Wed Jul 25 15:17:47 2018 -0700
@@ -0,0 +1,14 @@
+classdef (Abstract) InterpOps
+    properties (Abstract)
+        % C and F may refer to coarse and fine, but it's not a must.
+        IC2F % Interpolation operator from "C" to "F"
+        IF2C % Interpolation operator from "F" to "C"
+
+    end
+
+    methods (Abstract)
+        % Returns a string representation of the type of operator.
+        str = string(obj)
+    end
+
+end
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