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Checking casting of an enumerated type

MaurizioCDN

In my e-code I am retrieving  a byte from a menory read and then I cast it into an enumerated type created by myself; however before doing that I would like to check the validity of byte ,i.e. if the byte maps to a valid entry in the enumerated type. Is there a command to check that and issue an error if it does not map?

Thanks
Maurizio

  • Interesting question. Is your enumerated range contiguous? if so you may be able to simply do something like this:

    if my_byte is in [FIRST_ENUM..LAST_ENUM] then { //do something };

    Does anyone know a better way?

  • There's another way which might be even better - the method all_values() will return a list of all possible scalar types. Here's an example:

    type ttt: [E1=3, E2=10];

    extend sys {

        run() is also {

            var x: byte = 3;

            if x.as_a(ttt) in all_values(ttt) then { out(" *** X IS IN WITHIN RANGE *** ") };

        };

    };

    Hope this works for you.

    Yaron

     

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