Re: [LUA]: Cannot use userdata as table index

[Борис Александров <boriscool007@...>]

why addresses of two userdata's should be equal? they are dynamically allocated using ( lua_newuserdata ).

Also rawequal works until i'm commented __tostring and __equal metamethods

2015-07-11 2:10 GMT+10:00 Choonster TheMage <choonster.2010@gmail.com>:

On 11 July 2015 at 02:08, Choonster TheMage <choonster.2010@gmail.com> wrote:
> On 11 July 2015 at 01:59, Борис Александров <boriscool007@gmail.com> wrote:
>> Player(0)Player(0)
>>
>> 2015-07-11 1:44 GMT+10:00 Rob Kendrick <rjek@rjek.com>:
>>>
>>> On Sat, Jul 11, 2015 at 01:41:44AM +1000, Борис Александров wrote:
>>> > Example code:
>>> >
>>> > " temp = {}
>>> >   temp['string'] = 'foobar'
>>> >   temp[GetPlayer(0)] = 'player'
>>> >   temp[GetEntity(0)] = 'entity'
>>> >
>>> >   print(temp['string']) -- foobar
>>> >   print(temp[GetPlayer(0)]) -- nil
>>> >   print(temp[GetEntity(0)])  -- nil
>>>
>>>
>>> What does the following display?
>>>         print(GetPlayer(0), GetPlayer(0))
>>>
>>> B.
>>>
>>
>
> Can you remove the __eq and __tostring metamethods from the userdata
> and run this code?
>
> print("Equal?", GetPlayer(0) == GetPlayer(0))
> print("Addresses", GetPlayer(0), GetPlayer(0))
>
> If GetPlayer always returns the same userdata for a given player ID,
> the first line should be "Equal? true" and the second should have the
> same hexadecimal digit twice.
>
> If GetPlayer returns a different userdata each time, you won't be able
> to use it as a table key reliably (since the userdata objects won't be
> raw equal to each other).
>
> Regards,
> Choonster

You could also just use rawequal to check if they're equal (I forgot
about it before):

print("Equal?", rawequal(GetPlayer(0), GetPlayer(0)))