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+Functions intended to override others should be marked as such. This will improve readability as well as catch typos and type
+mismatch immediately.
+It is unfortunate that its use is not required, as backwards compatibility is in the way. Note that GCC 5.1+ has added new warning suggest-override that you can pass as command line option -Wsuggest-override. Perhaps we should use it...
+<code>
+  class A {
+    virtual void x() {}
+    virtual void y() {}
+  };
+  class B : public A {
+    void x() override {}      // good
+    void y()          {}      // accepted???? override optional
+    void x(int i) override {} // rejected, as intended
+    void y(int i)          {} // accepted, is it intended or not?
+    void x(double d) {}       // not sure what happens here.
+    void y(double d) {}       // accepted, as it always was.
+  };
+</code>