Hi Max,
Pharo doesn't have syntax for prefix operator like "-".
The parser does accepts a "-" before literal numbers but it's not possible for
arbitrary expressions.
However you have the message #negated .
negatedWidth
^ self width negated
Cheers,
Camille
On 16 juil. 2014, at 00:16, Verkoster Info <i...@derverkoster.de> wrote:
> Hi,
>
> I am using latest Pharo 3.0 + vm.
>
> I have a method width with
> width
>
> ^ 115 * self ratio.
> in my understanding it returns a Number.
>
> When I try to create a method
> negatedWidth
>
> ^ - (self width).
>
> the UI tells me that only Numbers may be negated. I am not able to save the
> method. Am I on a wrong path or should that work and if how can I avoid the
> UI error message?
>
> Regards
>
> Max
>
