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

[Félix Cloutier]

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 <swift-evolution at swift.org> 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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