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

["Andrew Lawson" <andyplawson@xxxxxxxxxxxxxx>]

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?