Re: [Savonet-users] References in Liquidsoap scripts

[okay_awright <oka...@dd...>]

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many thanks for your answer, indeed, it's just what I needed, and you
made it very simple to use! I wasn't sure *ref* was a real pointer
allocator so I played with variable definition scope and nested
procedures, and that combination appears to also provide that kind of
functionality. But now that I know how it works let's try some :)

Kudos.

On 31/07/2011 20:42, Romain Beauxis wrote:
> Hi!
> 
> 2011/7/30 okay_awright <oka...@dd...>:
>> I've got a specific question related to how Liquidsoap scripts work.
>> I'd like to 'propagate' an updated value from outside the definition of
>> a function, and not rely on global variables.
>> I was wondering how the *ref* keyword works, is it used to support
>> C-like pointers? I can't find the specific help page right now.
>> Say I've got a function "dummy_procedure" and I'd like to 'export' a
>> variable from outside the scope of this function, the caveat is that the
>> return value is already used for something else.
>> Can I use the *ref* keyword somehow to avoid composite return values
>>        def dummy_procedure(_ref_x) =
>>                _ref_x = 5
>>                7
>>        end
>>        x = 4
>>        ref_x = ref x;
>>        y = dummy_procedure(ref_x)
>> or should I use lists or maps to return both x and y from
>> dummy_procedure at the same time?
> 
> Variable references works as follows:
> # Setup a reference
> x = ref 1234
> 
> # Update the reference
> x := 4567
> 
> # Retrieve the reference
> y = !x
> 
> Does that answer your question?
> 
> Cheers,
> Romain

- -- 
best regards,

okay_awright
<okay_awright AT ddcr DOT biz>
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