No I haven't thats a big help thank you ! *___________________________________*
*James⎥Head of Trolls* *ja...@supmenow.com <ja...@supmenow.com>⎥supmenow.com <http://supmenow.com>* *Sup* *Runway East * *10 Finsbury Square* *London* * EC2A 1AF * On 29 July 2016 at 10:40, Zhao Xin <owe...@gmail.com> wrote: > Have you read > https://developer.apple.com/library/tvos/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithCAPIs.html#//apple_ref/doc/uid/TP40014216-CH8-ID17 > ? > > Zhaoxin > > On Fri, Jul 29, 2016 at 4:55 PM, James Campbell via swift-users < > swift-users@swift.org> wrote: > >> Do you know of any resources to brush up on the pointer aspect of swift >> ? >> >> *___________________________________* >> >> *James⎥Head of Trolls* >> >> *ja...@supmenow.com <ja...@supmenow.com>⎥supmenow.com >> <http://supmenow.com>* >> >> *Sup* >> >> *Runway East * >> >> *10 Finsbury Square* >> >> *London* >> >> * EC2A 1AF * >> >> On 29 July 2016 at 09:10, Dmitri Gribenko <griboz...@gmail.com> wrote: >> >>> On Fri, Jul 29, 2016 at 12:55 AM, James Campbell <ja...@supmenow.com> >>> wrote: >>> > So this: >>> > >>> > if let data = someArrayGeneratingFunction() { >>> > cFunction(UnsafeMutablePointer(data)) >>> > } >>> > >>> > Has issues with the array passed to c getting corrupted, but this >>> doesn't: >>> > >>> > let data = someArrayGeneratingFunction() >>> > >>> > if let data = data { >>> > cFunction(UnsafeMutablePointer(data)) >>> > } >>> >>> Neither piece of code is guaranteed to work. (You are just getting >>> lucky that the second one happens to work.) Array-to-pointer >>> conversion only extends the lifetime of the array until the immediate >>> function call returns. So after UnsafeMutablePointer(data) returns, >>> the array can be freed. >>> >>> Use someArrayGeneratingFunction.withUnsafeMutableBuffer { ... } instead. >>> >>> 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 <griboz...@gmail.com>*/ >>> >> >> >> _______________________________________________ >> swift-users mailing list >> swift-users@swift.org >> https://lists.swift.org/mailman/listinfo/swift-users >> >> >
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