I don't think that non-type generic arguments are enough to create fixed-size
arrays. How would you fill in `struct Vector<T, count: Int> { ... }`?
Seems to me that the first step would be actual language support for
non-parametrizable fixed-size arrays.
Félix
> Le 5 août 2016 à 04:53:20, Taras Zakharko via swift-evolution
> <swift-evolution@swift.org> a écrit :
>
>
>
>> A few things immediately spring to mind:
>> • Fixed-size arrays
>> • An optimized Matrix type
>> • Swifty syntax for Fourier transforms
>> • A numerical integrator (or diff-eq solver!)
>> • BigInt capabilities
>>
>> The first of these (fixed-size arrays) will probably require compiler
>> support.
>
> Fixed-size arrays should be easy enough to implement if the Swift generics
> are enhanced with support for constraints beyond type variables. E.g.
>
> struct Vector<T, count: Int> { … }
>
> var x : Vector<Float, count=16>
>
> or even
>
> struct SparseTensor<T, dimensions : [Int]> { … }
>
> var x: SparseTensor<Float, dimensions = [100, 100, 100, 100]> =
> SparseTensor(withValue: 0)
>
> I believe that something like this was mentioned in the discussion of the
> Generics Manifesto. If you are interested in making Swift more suitable for
> numerical operations, I’d say that the first order of business is to work
> towards implementing this sort of generic constants.
>
> Best,
>
> Taras
>
>>
>> The rest can already be done in a library, except I believe they will hit
>> the “generics cannot be specialized across module boundaries” slowdown, and
>> must be explicitly specialized for common numeric types to avoid it. (Has
>> this been fixed yet? Are there plans to?)
>>
>> Nevin
>>
>>
>>
>> On Wed, Aug 3, 2016 at 8:41 AM, Björn
>> Forster<swift-evolution@swift.org(mailto:swift-evolution@swift.org)>wrote:
>>> Hello Swift community,
>>> to make use of Swift more appealing and useful for science, engineering and
>>> finance and everything else involving actually calculating things, I think
>>> it would be a big step forward if Swift would ship with its own
>>> math/numerics library.
>>>
>>> Wouldn't it be great if Swift would offer functionality similar to Numpy in
>>> its native math lib? It think it would be great to have a "standard"
>>> annotation for vector arithmetic that the Swift community has agreed on and
>>> that scientific packages can build on.
>>>
>>> Which functionality should be covered by a Swift's math lib and where
>>> should be drawn the line?
>>>
>>> Any thoughts?
>>>
>>> (If it is not the right time now to talk this topic, as it is not mentioned
>>> in the goals for Swift 4 by Chris, I apologize for bringing this up now.
>>> But I think then this should be discussed later at some point not in the
>>> infinite future)
>>>
>>> Björn
>>> _______________________________________________
>>> swift-evolution mailing list
>>> swift-evolution@swift.org(mailto:swift-evolution@swift.org)
>>> https://lists.swift.org/mailman/listinfo/swift-evolution
>>>
>>
>>
>>
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