[Dev-luatex] unique node id?

Taco Hoekwater taco at elvenkind.com
Sun Aug 29 13:29:15 CEST 2010


On 08/29/2010 01:15 PM, Hans Hagen wrote:
> On 29-8-2010 9:03, Taco Hoekwater wrote:
>> On 08/29/2010 08:48 AM, Patrick Gundlach wrote:
>>>>
>>>> Is the following 172 something like I need? How would I access that
>>>> (besides string.gsub())?
>>>>
>>>> <node nil< 172> nil : hlist 2>
>>>
>>>
>>> I am currently using this number in the middle via tostring() and
>>> gsub(). But I'd still like to know if this can be used as an id.
>>
>> This number uniquely identifies a node for as long as it stays
>> allocated, yes. If it is freed, a new node may have the same
>> number.
>
> but for storing the node's id one can as well use the nodes user object
> itself as it's equally unique during the livespan of a node and one can
> compare pointers so the 'id' snippet in the string is not giving more
> uniqueness than the node user object itself

Not necessarily: there can be different userdata objects for the same
node. (I only just now realized that)

Best wishes,
Taco


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