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

[Stéphane Lizeray]

Tony, Andrew,

Here it is.

https://bugs.swift.org/browse/SR-2468 <https://bugs.swift.org/browse/SR-2468>

On Radar as well.

Thanks,

Stéphane

> On 24 Aug 2016, at 00:32, Tony Parker <anthony.parker at apple.com> wrote:
> 
> 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
>>> 
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