[swift-users] Memory Address of value types and reference types
Quinn "The Eskimo!"
eskimo1 at apple.com
Tue Sep 12 09:34:34 CDT 2017
On 12 Sep 2017, at 13:44, somu subscribe via swift-users <swift-users at swift.org> wrote:
> 1. Is the above shown the correct way to get reference type memory address ?
> 2. What Is it the correct way to get value type memory address ?
It’s hard to answer that without knowing how you’re intended to use these techniques. If you can explain more about where you’re going with this, I should be able to make some specific recommendations.
For example, if you’re goal were to pass a Swift object to a C API that takes a callback function pointer and a ‘cookie’ value, and hen calls that function with that cookie (like the `qsort_r` function), the to/from opaque mechanism provider by `Unmanaged` is the recommended way to pass a Swift object through such a cookie value.
> 3. Is it possible to get the memory address of immutable value type (declared as let)
No, because such values don’t necessarily exist in memory.
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Quinn "The Eskimo!" <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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