Added a try/catch block around the code in main().

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403299

examples/optimization_ex.cpp

@@ -111,6 +111,8 @@ private:
 
 int main()
 {
+    try
+    {
         // make a column vector of length 2
         column_vector starting_point;
         starting_point.set_size(2);
@@ -225,5 +227,10 @@ int main()
         );
         cout << starting_point << endl;
 
+    }
+    catch (std::exception& e)
+    {
+        cout << e.what() << endl;
+    }
 }