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Examples
Example: Ostrich.
If class Bird defines the virtual function Fly and you derive a new class Ostrich (a notoriously flightless bird) from Bird , how do you implement Ostrich::Fly ? The answer is, "It depends." If Bird::Fly guarantees success (i.e., provides the no-fail guarantee; see Item 71) because flying is an essential part of the Bird model, then Ostrich is not an adequate implementation of that model.
