[news.eclipse.modeling.gmt] Re: [Epsilon] EVL 'one' operator

[Dimitrios Kolovos <dskolovos@xxxxxxxxx>]

Hi Andrew,

I see. I'm afraid there is no such operation currently in EOL. Could you 
please open an enhancement feature in the bugzilla? As a temporary 
workaround you can use the select() operation and check the size of the 
returned result: e.g. Sequence{1,2,3}.select(i|i=1).size() = 1

Cheers,
Dimitrios

Andrew Lawson wrote:
> Hi Dimitrios,
>
> Is want to say that something exists, but only once?   I want to test that 
> in a collection an attribute is set to true but only for one member of the 
> collection.  In OCL you would replace 'exists' with 'one', is there anything 
> like this in EVL?
>
> Cheers,
> Andrew
>
>
> "Dimitrios Kolovos" <dskolovos@xxxxxxxxx> wrote in message 
> news:fsm9ou$hkf$1@xxxxxxxxxxxxxxxxxxxx
> > Hi Andrew,
> >
> > There is the 'exists' operation: e.g. Sequence{1,2,4}.exists(i|i=1) 
> > returns true.
> >
> > Please remember to prefix message subjects with [Epsilon] in the future 
> > :)
> >
> > Cheers,
> > Dimitrios
> >
> >
> > Andrew Lawson wrote:
> > > Does EVL have the 'one' operator to act on collections when you are 
> > > interested in a condition appearing only once?