Casting - bad design?

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since they require extensive updating to existing code

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You would consider adding one line to two existing headers "extensive?"

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Originally Posted by TheCPUWizard

You would consider adding one line to two existing headers "extensive?"

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I was speaking about a generalised visitor implementation - it depends on how many visitors you use. Changing every one to add a new handling function could be an big job, if you have a design that makes extensive use of visitors to supply the operations on your hierarchy.