Re: [Qemu-devel] Adding more function keys support

[Eric Blake]

On 12/13/2017 01:18 PM, Programmingkid wrote:

> Thank you BALATON for the file. One thing that caught my eye in this file is 
> this:
> 

>       if (usage->code == KEY_FN) {
>               asc->fn_on = !!value;
> 
> Why would they need the double !? 

Double '!!' is an idiomatic way to force a value to be converted to bool
(squashing all non-zero values into 1).

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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