+1 for Scala's path dependent types<span></span>.<br><br>On Saturday, 16 April 2016, Thorsten Seitz via swift-evolution <<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
> Am 15.04.2016 um 23:19 schrieb Dmitri Gribenko via swift-evolution <<a href="javascript:;" onclick="_e(event, 'cvml', 'swift-evolution@swift.org')">swift-evolution@swift.org</a>>:<br>
><br>
> On Fri, Apr 15, 2016 at 1:30 PM, Stephan Tolksdorf <<a href="javascript:;" onclick="_e(event, 'cvml', 'st@quanttec.com')">st@quanttec.com</a>> wrote:<br>
>> On 2016-04-12 Dmitri Gribenko via swift-evolution wrote:<br>
>>><br>
>>> Not even to mention that<br>
>>> indices are valid only in context of a particular collection instance,<br>
>>> so in this model you could validate an index against one collection<br>
>>> and use it with another one.<br>
>><br>
>><br>
>> The proposal requires Index values to be Comparable. Does that mean that<br>
>> indices from different collection instances should be comparable i.e. have a<br>
>> strict total order?<br>
><br>
> No, comparing indices from unrelated instances produces unspecified<br>
> results (incl. traps).<br>
<br>
Path dependent types as used in Scala would allow making this distinction type safe (see <a href="http://docs.scala-lang.org/tutorials/tour/inner-classes" target="_blank">http://docs.scala-lang.org/tutorials/tour/inner-classes</a> or <a href="http://danielwestheide.com/blog/2013/02/13/the-neophytes-guide-to-scala-part-13-path-dependent-types.html" target="_blank">http://danielwestheide.com/blog/2013/02/13/the-neophytes-guide-to-scala-part-13-path-dependent-types.html</a>) by allowing the index type to be rooted at the instance.<br>
<br>
Are there any plans to adding path dependent types to Swift?<br>
<br>
-Thorsten<br>
<br>
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</blockquote><br><br>-- <br>-- Howard.<br>