Swift 1.2 CVarArgType array casting crash
| Originator: | keithbsmiley | ||
| Number: | rdar://21435430 | Date Originated: | 17-Jun-2015 09:12 PM |
| Status: | Open | Resolved: | |
| Product: | iOS SDK | Product Version: | 8.3 |
| Classification: | Crash/Hang/Data Loss | Reproducible: | Always |
Summary:
Converting an array of type `[String]` to a `[CVarArgType]` doesn't work as expected. Converting literal arrays works fine but converting existing array references crashes.
Steps to Reproduce:
See the attached playground.
1. let array = ["a", "b"].map { $0 as CVarArgType } // Works fine
2. let brokenArray = ["a", "b"]
3. brokenArray as [CVarArgType] // Doesn't work
4. brokenArray.map { $0 as CVarArgType } // Works fine
Expected Results:
You should be able to cast a `[String]` to `[CVarArgType]`
Actual Results:
You have to map the conversion over the array rather than casting with `as`
Comments
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Example project here: https://github.com/keith/radars/tree/master/CVarArgTypeArrayIssue