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Alboin
Posted: Wed Dec 26, 2007 7:15 am Reply with quote
Joined: 26 Dec 2007 Posts: 1
Hello,

I've recently taken up Erlang, and have found it quite interesting. As an exercise, I decided to try and write a brainf*ck interpreter in Erlang.

As you probably know, bf uses an array that can move either left or right. At the moment, I'm using something like:
Code:
[HH | HT], C, [TH | TT]

To express said array. However, I've come to realize that bf's '[' and ']' instructions are going to require me to create another such structure for the array of instructions. (atm I'm just using a list.)

Now, in C, I would create an ADT, and use something like:
Code:

shift_list_right(...),
shift_list_left(...),
etc.

However, due to the fact that I'm overloading (Not sure of the correct Erlang term.) my main interpreter function like so:
Code:

bf({['-' | T], [HH | HT], C,  [TH | TT]}) ->
   bf({T, [HH | HT], C - 1, [TH | TT]});

I'm not too sure how I should go about this in the 'Erlang way'. Any thoughts?

Thanks!
Alboin
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