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# CFBridgingRetain(_:)

Casts an Objective-C pointer to a Core Foundation pointer and also transfers ownership to the caller.

```
func CFBridgingRetain(_ X: Any?) -> CFTypeRef?
```

## Discussion

You use this function to cast an Objective-C object as Core Foundation-style object and take ownership of the object so that you can manage its lifetime. You are responsible for subsequently releasing the object, as illustrated in this example:

```objc
NSString *string = <#Get a string#>;
CFStringRef cfString = (CFStringRef)CFBridgingRetain(string);
// Use the CF string.
CFRelease(cfString);
```

## See Also

[`CFBridgingRelease`](/documentation/Foundation/CFBridgingRelease)

Moves a non-Objective-C pointer to Objective-C and also transfers ownership to ARC.


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