Swift: How to use sizeof?

Question

In order to integrate with C API's while using Swift, I need to use the sizeof function. In C, this was easy. In Swift, I am in a labyrinth of type errors. I have this code: ``` var anInt: Int = 5 var anIntSize: Int = sizeof(anInt) ``` The second line has the error "'NSNumber' is not a subtype of 'T.Type'". Why is this and how do I fix it?

Accepted Answer

Use sizeof as follows:

```
let size = sizeof(Int)
```

`sizeof` uses the type as the parameter.

If you want the size of the `anInt` variable you can pass the `dynamicType` field to `sizeof`.

Like so:

```
var anInt: Int = 5
var anIntSize: Int = sizeof(anInt.dynamicType)
```

Or more simply (pointed out by user102008):

```
var anInt: Int = 5
var anIntSize: Int = sizeofValue(anInt)
```

Swift: How to use sizeof?

Solution

Problem