[swift-users] Data(bytesNoCopy:count:deallocator)

[Tony Parker]

We should probably add a predefined enum for a deallocator that matches UnsafeMutableRawPointer.allocate. Stéphane or Andy, would you mind filing a JIRA or radar for that?

- Tony

> On Aug 23, 2016, at 9:24 AM, Andrew Trick via swift-users <swift-users at swift.org> wrote:
> 
> 
>> On Aug 23, 2016, at 8:40 AM, Stéphane Lizeray via swift-users <swift-users at swift.org> wrote:
>> 
>> Hello,
>> 
>> I create an UsafeMutableRawPointer using the allocate method.
>> 
>> Later on I want to create a Data struct from this pointer using the bytesNoCopy initializer. Which deallocator should I pass?
>> 
>> It looks like this:
>> 
>> let retPointer = UnsafeMutableRawPointer.allocate(bytes: size, alignedTo: MemoryLayout<UInt8>.alignment)
>> ….
>> 
>> let d = Data(bytesNoCopy: retPointer, count: size,deallocator:Deallocator.free)
> 
> Hi Stéphane,
> 
> This should work:
> 
> let retPointer = UnsafeMutableRawPointer.allocate(bytes: size, alignedTo: MemoryLayout<UInt8>.alignment)
> 
> let d = Data(bytesNoCopy: retPointer, count: size, deallocator: .custom({ (ptr, size) in
>      ptr.deallocate(bytes: size, alignedTo: 1)
>    }))
> 
> -Andy
> 
>> 
>> Thanks,
>> 
>> Stéphane
>> 
>> _______________________________________________
>> swift-users mailing list
>> swift-users at swift.org
>> https://lists.swift.org/mailman/listinfo/swift-users
> 
> _______________________________________________
> swift-users mailing list
> swift-users at swift.org
> https://lists.swift.org/mailman/listinfo/swift-users