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Acceleo : How do I compare the value of the current and the previous iteration in a for loop [message #1733932]

Thu, 02 June 2016 06:09

Eclipse User

Is it possible to compare the value of the current and the previous iteration in a for loop in Acceleo ? Knowing that LET can be defined inside for loop but it will be mutable at each current iteration, therefore the previous value will be lost and we will get always only the current value.
Any idea guys ?
Thanks.

Re: Acceleo : How do I compare the value of the current and the previous iteration in a for loop [message #1733986 is a reply to message #1733932]

Thu, 02 June 2016 12:11

Eclipse User

Hi

The pure OCL solution is to use the integer Sequence idiom

Sequence{1..N}->forAll(i : Integer | ... ->at(i) ...)

this allows you to refer to i+1/i-1 or whatever.

IIRC Acceleo has a secret "i" variable that dioes this for free. However
it is not in accord with the OMG MOFM2T specification.

Regards

Ed Willink

On 02/06/2016 13:24, Hassen Bazar wrote:
> Is it possible to compare the value of the current and the previous
> iteration in a for loop in Acceleo ? Knowing that LET can be defined
> inside for loop but it will be mutable at each current iteration,
> therefore the previous value will be lost and we will get always only
> the current value. Any idea guys ? Thanks.

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