[swift-users] NSMutableData's init?(length length: Int) initializer

[Dmitri Gribenko]

On Thu, Apr 14, 2016 at 11:16 PM, Chris Lattner via swift-users
<swift-users at swift.org> wrote:
>
>> On Apr 14, 2016, at 10:45 AM, soyer via swift-users <swift-users at swift.org> wrote:
>>
>> Hello Guys, Girls,
>>
>> Do you know why is the init?(length length: Int) NSMutableData's initializer failable?
>> The memory allocation can fail, but I think Swift doesn't handle that cases. (it is not a real issue in a modern OS)
>> The code on github calls a non failable initializer.
>> https://github.com/apple/swift-corelibs-foundation/blob/master/Foundation/NSData.swift#L904
>
> Swift’s policy on memory allocation failure is that fixed-size object allocation is considered to be a runtime failure if it cannot be handled.  OTOH, APIs that can take a variable and arbitrarily large amount to allocate should be failable.  NSData falls into the later category.

Does this principle apply to Array(repeating:count:)?
Array.append(contentsOf:)?

Dmitri

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