[swift-dev] Starter project: API to upgrade AnySequence to Any*Collection

[Dmitri Gribenko]

It would require a proposal and a review, but the implementation is
more challenging here than the API design.  The proposal would be
trivial, just one extra API, if I'm imagining this correctly.

Dmitri

On Mon, Dec 7, 2015 at 2:10 PM, Austin Zheng <austinzheng at gmail.com> wrote:
> Would this require a review/proposal, since it involves an API change?
>
> On Mon, Dec 7, 2015 at 2:08 PM, Dmitri Gribenko via swift-dev
> <swift-dev at swift.org> wrote:
>>
>> Hi,
>>
>> If someone looks for a starter project in the standard library with
>> intermediate complexity (prior experience with Swift generics
>> required), here's one.
>>
>> This is in the area of existential sequence and collection wrappers.
>>
>> Upgrading AnyForwardCollection to AnyRandomAccessCollection works:
>>
>> (swift) AnyRandomAccessCollection(AnyForwardCollection([1,2,3]))
>> // r2 : AnyRandomAccessCollection<Int>? =
>> Optional(Swift.AnyRandomAccessCollection<Swift.Int>(_box:
>> Swift._CollectionBox<Swift.Array<Swift.Int>>))
>>
>> Seems like we don't provide APIs to upgrade AnySequence to Any*Collection:
>>
>> (swift) AnyRandomAccessCollection(AnySequence([1,2,3]))
>> <REPL Input>:1:1: error: cannot invoke initializer for type
>> 'AnyRandomAccessCollection<_>' with an argument list of type
>> '(AnySequence<Int>)'
>>
>> Of course, this should work without copying the underlying collection.
>>
>> https://bugs.swift.org/browse/SR-119
>>
>> Dmitri
>>
>> --
>> main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
>> (j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/
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>
>



-- 
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/