Convert __FLT_EPSILON__ from Objective-C to Swift

Question

I have this line of code in Objective-C and I absolutely need to "translate" it to Swift.

BOOL hasBlur = blurRadius > __FLT_EPSILON__

Unfortunately I am getting this error:

Using unresolved identifier __FLT_EPSILON _

Could you help me? Thanks to

+3

Sara canducci 25 Aug 14 at 18:34

4 answers

For fast 3.1 or higher

CGFloat.ulpOfOne

OR

double.ulpOfOne

+4

Hiren panchal 03 Apr 17 at 15:07

It looks like it comes from an Objective C line that looked like this:

#define __FLT_EPSILON__ 1.19209290e-7F

(Source: this thread ). So you can safely replace it here with your literal value.

0

Patrick collins 25 Aug 14 at 18:42

just use this: let FLT_EPSILON = CGFloat (FLT_EPSILON)

0

dyljqq 08 Sep '16 at 2:30

Martin R · Accepted Answer · 2014-08-25T19:21:07+0000

__FLT_EPSILON__

- predefined compiler macro, apparently not available in Swift. But <float.h>

defines

#define FLT_EPSILON __FLT_EPSILON__

and this is available in Swift as well:

let hasBlur = blurRadius > FLT_EPSILON