core foundation - Swift 2 CFType conversion -


in swift 1.2 had c function following signature:

__nonnull cfarrayref fdcreatesupportedaudiofileextensions() cf_returns_retained;

i know function returns array of cfstringref instances, called swift this:

let supportedaudiotypes = fdcreatesupportedaudiofileextensions() as! [string]

and worked expected. however, in swift 2 code fails @ runtime due forced cast (exc_bad_instruction). i'm able things working following:

let supportedaudiotypes = fdcreatesupportedaudiofileextensions() nsarray as! [string]

i'm unsure changed swift 1.2 2.0. bug in current version of swift or have missed something? i've read implies cftypes toll-free bridged swift counterparts i'm not sure why used work failing.


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