Eclipse Community Forums: VIATRA

Help

Home

Home » Modeling » VIATRA » Type Casting

Show: Today's Messages :: Show Polls :: Message Navigator

Type Casting [message #1292954]

Sat, 12 April 2014 06:55

Reza Gorgan

Messages: 2
Registered: April 2014

Junior Member

Hello.
I have a question which I think is related to type casting.
In the model space there is an entity of type Sample with a relation of type amount to an entity of type datatypes.Integer (which also exists in the model space). The following transformation rule does not work

gtrule Calculate(out A,out B)= {
precondition pattern FindSample(A,B)= {
Sample(A);
datatypes.Integer(B);
Sample.amount(X,A,B);
}
action {
let Z= 1 in seq {
update Z = 4 * value(B);
}

}
}

(Operator '*' is undefined for the argument types ('datatypes.Integer', 'datatypes.String')

In fact, I need to do some computations using the value of an entity.

Thanks for your help.

Report message to a moderator

Re: Type Casting [message #1294749 is a reply to message #1292954]

Sun, 13 April 2014 19:26

Zoltan Ujhelyi

Messages: 392
Registered: July 2015

Senior Member

Hi Reza,

if I recall correctly, the call value(B) gives a string return value. If you know, that the correct value is an integer, you could use the toInteger conversion operator, such as follows (I hope, I remember the syntax):

action {
let Z= 1 in seq {
update Z = 4 * toInteger(value(B));
}

Cheers,
Zoltán

Report message to a moderator