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Re: Determining underlying type of array in swift?
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Re: Determining underlying type of array in swift?


  • Subject: Re: Determining underlying type of array in swift?
  • From: Quincey Morris <email@hidden>
  • Date: Wed, 09 Dec 2015 14:57:17 -0800
  • Feedback-id: 167118m:167118agrif8a:167118sg5PfbLlfZ:SMTPCORP

On Dec 9, 2015, at 14:35 , Rick Mann <email@hidden> wrote:
>
> If I have var foo : [Int], how can I get that type, Int? I need to get the size of each element.

I imagine there’s a direct way, but I can’t find it in a program. You can do something like this:

	strideofValue (foo [0])			// but this requires foo.count != 0, or:
	strideof (foo [0].dynamicType) 		// which seems to work in a playground even for empty arrays

Note that I’m not sure there’s an API guarantee that the Array<> elements are stored contiguously in memory. If you want that, you should probably use ContiguousArray<> instead. (That also gives you API to directly/unsafely access the memory too, IIRTGHF** correctly.)

Do be careful, though. If you’re accessing Ints raw-ly, and (say) saving them or transmitting them to another application or platform, you might also have to worry about element size and endianness differences, theoretically.


** "If I Read The Generated Header File"
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