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It was not possible to avoid the cast when reading the models from the XML file, but it was possible to directly allocate the models and to display them.
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There is no method that returns a GOptimizer object, hence no cast is needed.
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An GXmlNode* output typemap has been added to GTemplates.i that provides automatic type conversion for XML nodes. Now, the cast_ methods are obsolete. They therefore have been removed.
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Having this typemap allows to remove the cast_ methods.