<div dir="ltr">Would this require a review/proposal, since it involves an API change?</div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Dec 7, 2015 at 2:08 PM, Dmitri Gribenko via swift-dev <span dir="ltr"><<a href="mailto:swift-dev@swift.org" target="_blank">swift-dev@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
If someone looks for a starter project in the standard library with<br>
intermediate complexity (prior experience with Swift generics<br>
required), here's one.<br>
<br>
This is in the area of existential sequence and collection wrappers.<br>
<br>
Upgrading AnyForwardCollection to AnyRandomAccessCollection works:<br>
<br>
(swift) AnyRandomAccessCollection(AnyForwardCollection([1,2,3]))<br>
// r2 : AnyRandomAccessCollection<Int>? =<br>
Optional(Swift.AnyRandomAccessCollection<Swift.Int>(_box:<br>
Swift._CollectionBox<Swift.Array<Swift.Int>>))<br>
<br>
Seems like we don't provide APIs to upgrade AnySequence to Any*Collection:<br>
<br>
(swift) AnyRandomAccessCollection(AnySequence([1,2,3]))<br>
<REPL Input>:1:1: error: cannot invoke initializer for type<br>
'AnyRandomAccessCollection<_>' with an argument list of type<br>
'(AnySequence<Int>)'<br>
<br>
Of course, this should work without copying the underlying collection.<br>
<br>
<a href="https://bugs.swift.org/browse/SR-119" rel="noreferrer" target="_blank">https://bugs.swift.org/browse/SR-119</a><br>
<span class="HOEnZb"><font color="#888888"><br>
Dmitri<br>
<br>
--<br>
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if<br>
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <<a href="mailto:gribozavr@gmail.com">gribozavr@gmail.com</a>>*/<br>
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</font></span></blockquote></div><br></div>