Generics Algorithms

RE: Generics Algorithms

Olivier — Fri, 14 Nov 2003 12:46:00 GMT

You can avoid virtual with: public interface ICalculator<T> { T Add(T a, T b); } class AlgorithmLibrary<T, IC> where T: new() where CT: ICalculator<T> { CT calculator; public AlgorithmLibrary(CT calculator) { this.calculator = calculator; } public T Sum(List<T> items) { T sum = new T(); for (int i = 0; i < items.Count; i++) { sum = calculator.Add(sum, items[i]); } return sum; } } namespace Int32 { public class Calculator: ICalculator<int> { public int Add(int a, int b) { return a + b; } } } but i don't yet have received Whidbey to compare performance.

RE: Generics Algorithms

Nicholas Paldino — Fri, 14 Nov 2003 16:26:00 GMT

While the solution does not strike me as anything incredibly new (think STL), the only way you will get it to work (and I mean work in the sense of acceptance) is if you create your own algorithm library, with skeletons required (abstract classes and interfaces) to inject our own custom types into the algorithms. I don't remember if it was you or someone else from MS, but it was said that the only way that something like this is effective is if there is universal coverage, which has more potential to lead to universal adoption. Based on that, my question would be, are you going to create such an algorithm library, along the lines of STL, and if so, what kinds of algorithms are you going to create?

RE: Generics Algorithms

Eric — Fri, 14 Nov 2003 19:05:00 GMT

Thanks, Olivier. I had thought about trying interfaces, but hadn't gotten around to it yet.

RE: Generics Algorithms

Dilip — Sat, 15 Nov 2003 03:30:00 GMT

http://weblog.ikvm.net/permalink.aspx/94eed5a8-6c9c-4d1d-a001-321344a2d2f6

RE: Generics Algorithms

(luKa) — Tue, 18 Nov 2003 05:53:00 GMT

Wouldn't be possible to have a constraints for a type parameter to specifie a required member (a method, an operator, ecc) just like this? namespace Int32 { public class Calculator<T> where T: T Add(T, T) { public T Add(T a, T b) { return a + b; } } } TIA (luKa)

RE: Generics Algorithms

(luKa) — Tue, 18 Nov 2003 05:58:00 GMT

Ops... I was meaning this class AlgorithmLibrary<T> ....where T: new(), T Add(T, T) { ....// ... }

RE: Generics Algorithms

Anonymous — Tue, 18 Nov 2003 19:35:00 GMT

RE: Generics Algorithms

andrew queisser — Tue, 18 Nov 2003 19:38:00 GMT

luKa, I think you're pointing out the fundamental problem with generic algorithms in C#. There's no way to do anything inside a generic algorithm unless you specify an exact type or interface. That puts the burden on the caller of the generic algorithm to pass in a the type needed by the algorithm. That's the exact oppositie of a "generic" algorithm. Looks like several people are thinking about how to get around this problem (see Eric's post above). Andrew Queisser

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Ref:

http://www.codeproject.com/csharp/genericnumerics.asp

Introduction

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