Re: [BLACKBOX] BlackBox 1.6 final version - COMPLEX datatypes?

From: [at]} <Josef>
Date: Sun, 5 Jul 2009 16:54:27 +0200

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> It would have the additional benefit of allowing DECIMAL maths, MATRIX maths,
> etc. etc. all of which could then be implemented by others without any
> knowledge of the internal workings of the compiler. As well as overloaded
> operators and structured returns some mechanism would also be need to allow
> the programmer to define complex literal values e.g. COMPLEX(1.0, 2.0).

Once again, I am not sure that structured return types are really necessary for
supporting operator overloading on structured types.
It seems to me that a very simple convention would also suffice:

Use IN params for the inputs and a single OUT param for the result.

e.g.:

PROCEDURE "+" (IN x, y: COMPLEX; OUT z: COMPLEX);

This has the advantage that it avoids copying the
result value in the RETURN statement!
The compiler can transform an expression that contains such operators
in a sequence of procedure calls and it would have to introduce
appropriate local variables. I would expect this step to be rather
straight forward.

I guess, MATRIX operations are significantly more complicated because
there is no fixed type MATRIX at all. So they will probably need
dynamic memory depending on the number of rows and columns.


- Josef

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Received on Sun Jul 05 2009 - 16:54:27 UTC