Re: [swift-evolution] Proposal Sketch: Bring flexible array members in as Array|UnsafeReference

[Dmitri Gribenko via swift-evolution]

On Tue, Dec 22, 2015 at 2:29 PM, T.J. Usiyan via swift-evolution <
swift-evolution@swift.org> wrote:

> MIDIMetaEvent and MIDIEventUserData are both examples of framework
> provided types which rely on flexible member arrays. Their last member is
> (officially) an array of UInt8 with 1 element. In practice, developers are
> meant to allocate enough space for an array of the necessary length along
> with the rest of the struct.
>
> These members come into swift as single element tuples. I propose either
> automatic import of these as Array or UnsafeReference.
>

It is important to sketch out an implementation strategy for this proposal.

Dmitri

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Re: [swift-evolution] Proposal Sketch: Bring flexible array members in as Array|UnsafeReference

[Félix Cloutier via swift-evolution]

In general, I find that importing C arrays is problematic. I don't have any 
nice solution to offer, though.

For now, you might be able to get away with withUnsafePointer(&event.data) { 
... }.

Félix

> Le 22 déc. 2015 à 17:29:10, T.J. Usiyan via swift-evolution 
>  a écrit :
> 
> MIDIMetaEvent and MIDIEventUserData are both examples of framework provided 
> types which rely on flexible member arrays. Their last member is (officially) 
> an array of UInt8 with 1 element. In practice, developers are meant to 
> allocate enough space for an array of the necessary length along with the 
> rest of the struct.
> 
> These members come into swift as single element tuples. I propose either 
> automatic import of these as Array or UnsafeReference.
> 
> Example of the current situation:
> /*!
>   @struct MIDIMetaEvent
>   @discussion The parameters to specify a MIDI meta event
> */
> public struct MIDIMetaEvent {
> 
> public var metaEventType: UInt8
> public var unused1: UInt8
> public var unused2: UInt8
> public var unused3: UInt8
> public var dataLength: UInt32
> public var data: (UInt8)
> public init()
> public init(metaEventType: UInt8, unused1: UInt8, unused2: UInt8, 
> unused3: UInt8, dataLength: UInt32, data: (UInt8))
> }
> 
> /*!
>   @struct MusicEventUserData
>   @discussion Provides a general struct for specifying a user defined 
> event. 
>   @field  length
>   the size in bytes of the data
>   @field  data
>   size bytes of user defined event data
> */
> public struct MusicEventUserData {
> 
> public var length: UInt32
> public var data: (UInt8)
> public init()
> public init(length: UInt32, data: (UInt8))
> }
> 
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