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POIs there a name for this pattern of using generics?
 

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  1. POIs there a name for this pattern of using generics?
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    <pre><code>//this class (or interface if you like) is set up as generic... public abstract class GenericBase&lt;T&gt; { public T PerformBasicTask(T in) { ... } } //... but is intended to be inherited by objects that close the generic... public class ConcreteForDates:GenericBase&lt;DateTime&gt; { public DateTime PerformSpecificTask(DateTime in) { ... } } //... so that consuming code never knows that a generic is involved var myDateConcrete = new ConcreteForDates(); //look ma, no GTP! //These two methods look alike, and there is no generic type inference, //even with PerformBasicTask(). var basicResult = myDateConcrete.PerformBasicTask(DateTime.Now); var specificResult = myDateConcrete.PerformSpecificTask(DateTime.Today); //does not compile because T is understood by inheritance to be a DateTime, //even though PerformBasicTask()'s implementation may well handle an int. var anotherBasicResult = myDateConcrete.PerformBasicTask(1); </code></pre> <p>I've seen and used this pattern several times, and it's very useful for providing common functionality across a series of type-specific subclasses. For instance, this could be a model for Controllers/Presenters specific to a type of domain object that is central to the page(s) the class is used to control; basic operations like retrieval/persistence may use 100% common functionality, but binding/unbinding may be very specific. </p> <p>Is there a name for this pattern of generic declaration without exposing the generic to the end user?</p>
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    1. USKeithS
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    1. CO"Closing the generic" sounds good to me.
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    2. COSo why exactly would you want to do this?
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    3. COWell, for instance, you may have a set of Controllers that each take one of your domain classes (or a DTO) and perform bind/unbind/validate tasks on a View in the UI. In addition, they would also have to know how to retrieve and persist these objects. That persistence mechanism may (IMO should) be well-abstracted such that the operation can be performed by the controller using the same code. But, validation/binding/unbinding would almost certainly be very class-specific.
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