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# kCFCoreFoundationVersionNumber

```
let kCFCoreFoundationVersionNumber: Double
```

## Discussion

The current version of the Core Foundation framework. Compare this value to the values in [Framework Version Numbers](/documentation/CoreFoundation/framework-version-numbers).Although this variable was added to the CFBase.h header file in OS X v10.1, it was available and can be used in OS X v10.0.

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