Static AVCaptureISOCurrent

pub unsafe static AVCaptureISOCurrent: c_float

Available on crate feature AVCaptureDevice only.

A special value that may be passed as the ISO parameter of setExposureModeCustomWithDuration:ISO:completionHandler: to indicate that the caller does not wish to specify a value for the ISO property, and that it should instead be set to its current value. Note that the device may be adjusting ISO at the time of the call, in which case the value to which ISO is set may differ from the value obtained by querying the ISO property.

See also Apple’s documentation