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diff --git a/Examples/ruby/functor/example.i b/Examples/ruby/functor/example.i
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+/* File : example.i */
+%module example
+
+%inline %{
+// From B. Strousjoup, "The C++ Programming Language, Third Edition", p. 514
+template<class T> class Sum {
+   T res;
+public:
+   Sum(T i = 0) : res(i) { }
+   void operator() (T x) { res += x; }
+   T result() const { return res; }
+};
+
+%}
+
+/**
+ * Rename the application operator to call() for Ruby.
+ * Note: this is normally automatic, but if you had to do it yourself
+ * you would use this directive:
+ *
+ *      %rename(call) *::operator();
+ */
+
+// Instantiate a few versions
+%template(IntSum) Sum<int>;
+%template(DoubleSum) Sum<double>;