For example, for a server that manages fonts, each font might be capable of the same functions, but implement them differently. In this case, you define a single abstract child base class, but derive a number of dispatcher implementation classes from that one base. Each derived class represents a different font type.
When the parent dispatcher gets a request, it identifies the font type and returns the child ID for the child dispatcher that handles that font type. The child caller then issues requests directly to the dispatcher that owns the implementation class for that specific behavior.
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