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Constrained genericity: Difference between revisions
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→{{header|Objective-C}}
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@end</lang>
Type constraints in type parameters can be made via the <code>:</code> keyword, indicating in this case that the type argument must be a type that is a subtype of <code>id<Eatable></code>.
<lang objc>@interface FoodBox<T : id<Eatable>> : NSObject
@end</lang>
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