[SR-2468] Add a predefined enum for a deallocator that matches UnsafeMutableRawPointer.allocate in Data(bytesNoCopy:count:deallocator) #4334

swift-ci · 2016-08-24T14:38:19Z

Additional Detail from JIRA

md5: 350bc083a2e707af5a997f7350836230

Issue Description:

At the moment we must define a custom allocator for the following code:

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)
}))

It would be nice to have a predefined enum for a deallocator that matches UnsafeMutableRawPointer.allocate

swift-ci · 2016-08-24T14:40:44Z

Comment by Stéphane Lizeray (JIRA)

@parkera @atrick here is the feature request we have been discussing about by mail in the swift-users mailing list

atrick · 2016-08-24T17:45:06Z

Thanks for filing this.

The same predefined deallocator should work with memory allocated from either:

UnsafeMutablePointer<T>.allocate(capacity:)

or

UnsafeMutableRawPointer.allocate(bytes: alignedTo:)

It just needs to store the size and alignment and invoke:

UnsafeMutableRawPointer.deallocate(bytes: alignedTo:)

swift-ci transferred this issue from apple/swift-issues Apr 25, 2022

shahmishal transferred this issue from apple/swift May 5, 2022

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