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# CFAttributedStringCreateCopy(_:_:)

Creates an immutable copy of an attributed string.

```
func CFAttributedStringCreateCopy(_ alloc: CFAllocator!, _ aStr: CFAttributedString!) -> CFAttributedString!
```

## Parameters

`alloc`

The allocator to use to allocate memory for the new attributed string. Pass `NULL` or [`kCFAllocatorDefault`](/documentation/CoreFoundation/kCFAllocatorDefault) to use the current default allocator.

`aStr`

The attributed string to copy.

## Return Value

An immutable attributed string with characters and attributes identical to those of `aStr`. Returns `NULL` if there was a problem copying the object. Ownership follows the [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029).

## Discussion

---

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