Re: Re[2]: using 'uint64_t' with Alien

[Fabio Mascarenhas <mascarenhas@...>]

On Thu, Jul 9, 2009 at 6:26 AM, Bulat
Ziganshin<bulat.ziganshin@gmail.com> wrote:
> Hello Fabio,
>
> Thursday, July 9, 2009, 9:13:13 AM, you wrote:
>
> LGMP implements unbounded integers. it is somewhat overkill for 64-bit
> integers that have more efficient representation

Yep, that is why I said that it is good for a quick hack, but for
adding to Alien I prefer to use 64-bit long userdatas and implement
all the arithmetic and bitops on those. LGMP is just something Phoenix
could use to add 64-bit support to Alien in half-dozen lines of code.

--
Fabio Mascarenhas

>> Phoenix,
>
>> I just found out about LGMP
>> (http://members.chello.nl/~w.couwenberg/lgmp.htm), I think it is a
>> nice solution for representing 64-bit integers in Lua if you want to
>> hack something up quickly, as it has both arithmetic and bitwise ops
>> if you want to hack something up quickly. If you want to do it by
>> modifying Alien I suggest you check out the head at
>> http://github.com/mascarenhas/alien/tree/master, as I did some
>> refactoring of Alien's code that makes adding new types a little
>> easier.
>
>> The way I will do it for Alien when I get around to implemeting this,
>> though, is to use a 64-bit long userdata, and have bitops as methods
>> of this userdata's __index metamethod (plus conversion to and from
>> strings, and arithmetic/relational metamethods, of course).
>
>> --
>> Fabio Mascarenhas
>
>> On Thu, Jul 9, 2009 at 2:12 AM, Fabio
>> Mascarenhas<mascarenhas@gmail.com> wrote:
>>> Phoenix,
>>>
>>> I just found out about LGMP
>>> (http://members.chello.nl/~w.couwenberg/lgmp.htm), I think it is a
>>> nice solution for representing 64-bit integers in Lua if you want to
>>> hack something up quickly, as it has both arithmetic and bitwise ops
>>> if you want to hack something up quickly. If you want to do it by
>>> modifying Alien I suggest you check out the head at
>>> http://github.com/mascarenhas/alien/tree/master, as I did some
>>> refactoring of Alien's code that makes adding new types a little
>>> easier.
>>>
>>> The way I will do it for Alien when I get around to implemeting this,
>>> though, is to use a 64-bit long userdata, and have bitops as methods
>>> of this userdata's __index metamethod (plus conversion to and from
>>> strings, and arithmetic/relational metamethods, of course).
>>>
>>> --
>>> Fabio Mascarenhas
>>>
>>>
>>>
>>> On Thu, Jul 9, 2009 at 12:54 AM, Phoenix Sol<phoenix@burninglabs.com> wrote:
>>>> Sigh; I was ignorantly hoping that these things could be 'implicitly
>>>> converted' on the C side.
>>>> ( Though not very optimistic about the result of doing so. )
>>>>
>>>> I really need to make the time to learn C; which shall I give up: sleeping,
>>>> eating, or my children?
>>>> ( I've already given up entertainment, social life, and sex. )
>>>>
>>>> Phoenix Sol
>>>>
>>>>
>>>> On Wed, Jul 8, 2009 at 10:29 PM, Sam Roberts <vieuxtech@gmail.com> wrote:
>>>>>
>>>>> On Wed, Jul 8, 2009 at 8:05 PM, Phoenix Sol<phoenix@burninglabs.com>
>>>>> wrote:
>>>>> > Thanks, Sam.
>>>>> >
>>>>> > I tried doing this:
>>>>> >   tyr.tcrdbrnum:types('double', 'pointer')  --( that's return type, arg
>>>>> > type(s), in case you don't speak Alien ) ( and Alien will try to convert
>>>>>
>>>>> I'd never heard of alien before this post. It doesn't surprise me the
>>>>> things you tried failed. You have to tell alien the truth about the C
>>>>> API, it won't be able to magically figure out what you want it to do.
>>>>>
>>>>> I'd talk to Fabio, I think he could modify Alien (or you could) pretty
>>>>> trivially so that it used decimal strings on the lua side for
>>>>> (u)int64s on the C side. Without that, you aren't going to be able to
>>>>> use Alien, I don't think.
>>>>>
>>>>> Sam
>>>>
>>>>
>>>
>
>
>
> --
> Best regards,
>  Bulat                            mailto:Bulat.Ziganshin@gmail.com
>
>