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# class_createInstance(_:_:)

Creates an instance of a class, allocating memory for the class in the default malloc memory zone.

```
func class_createInstance(_ cls: AnyClass?, _ extraBytes: Int) -> Any?
```

## Parameters

`cls`

The class that you want to allocate an instance of.

`extraBytes`

An integer indicating the number of extra bytes to allocate. The additional bytes can be used to store additional instance variables beyond those defined in the class definition.

## Return Value

An instance of the class `cls`.

## See Also

[`objc_constructInstance`](/documentation/ObjectiveC/objc_constructInstance)

Creates an instance of a class at the specified location.


---

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