I’m currently -1 on this, because I don’t think simulator/device is a 
worthwhile-enough distinction for a built-in condition.

- Are you maybe looking for a Debug/Release condition? Because we already have 
that, through compile-time variables (the “-D” option).
- Does your platform’s simulator/emulator expose any additional API? Great! 
Take a look at #canImport…
- Why else would you need to distinguish simulator/device, and why are OS and 
architecture not sufficient for that case?

Karl

> On 25. Oct 2017, at 05:05, Graydon Hoare via swift-evolution 
> <[email protected]> wrote:
> 
> Hi,
> 
> I'd like to propose a variant of a very minor, additive proposal Erica Sadun 
> posted last year, that cleans up a slightly messy idiomatic use of 
> conditional compilation in libraries. The effects should be quite limited; 
> I'd call it a "standard library" addition except that the repertoire of 
> compiler-control statements isn't strictly part of the stdlib.
> 
> Proposal is here: 
> https://gist.github.com/graydon/809af2c726cb1a27af64435e47ef4e5d 
> <https://gist.github.com/graydon/809af2c726cb1a27af64435e47ef4e5d>
> 
> Implementation (minus fixits) is here: 
> https://github.com/graydon/swift/commit/16493703ea297a1992ccd0fc4d2bcac7d078c982
>  
> <https://github.com/graydon/swift/commit/16493703ea297a1992ccd0fc4d2bcac7d078c982>
> 
> Feedback appreciated,
> 
> -Graydon
> 
> _______________________________________________
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