Expressed in Factor:
: depth ( -- n ) datastack length ;
: package-stack ( -- seq )
datastack [ depth narray ] with-datastack ;
...but just the datastack word itself will result in the same sequence ;-)
On Tue, Jun 19, 2012 at 8:52 PM, Graham Telfer <gakouse...@hotmail.com> wrote:
> Doug Coleman <doug.coleman@...> writes:
>
>>
>> How would you do this in C? Would you take the return address off the
>> stack frame, then start calculating the division-by-2s and pushing
>> them to the local stack frame in a loop, and then walk back up
>> accumulating them in an array until you hit the return address, at
>> which point you return the array?
>>
>> That's kind of what it sounds like you're suggesting, which would be
>> kind of fun but totally impractical. In C, you'd collect them
>> immediately after you calculate them, too, just like you should in
>> Factor.
>>
>> The data stack is not for storing all your data, just for threading
>> arguments and return values between word calls in a predictable way
>> (known stack height.)
>>
>> Is that helpful? :)
>>
>> Doug
>
> I know nothing about C. In Prolog an accumulator is exactly what I'd use.
>
> Forth has a "Depth" word which is partly why I expected one in Factor. When
> the
> job has finished the stack depth is known and
>
> As an alternative data structure to I tried constructing a list and adding
> each
> new result to it; but the list data structure in Factor is so messy and
> unwieldy
> I quickly decided not to use it. The Lisp words "cons" "cadr" are dreadful.
> Prolog and Haskell are much more elegant in their use of lists.
>
>
>
>
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