Re[2]: invalid table index
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- Subject: Re[2]: invalid table index
- From: Dmitriy Iassenev <iassenev@...>
- Date: 2006年11月15日 17:37:43 +0200
thank you very much!
>> if we try to assign
>>
>> b[nil] = {}
>>
>> then we get error 'table index is invalid', but if we try
>>
>> if b[nil] == nil then
>> ...
>> end
>>
>> no error is raised. Is it correct behaviour?
AB> Yes. The manual says:
>> An access to an indexed variable t[i] is equivalent to a
>> call gettable_event(t,i).
AB> and
>> An assignment to an indexed variable t[i] = val is
>> equivalent to settable_event(t,i,val).
AB> Both of these functions are
>> not defined or callable in Lua. We use [them] here only
>> for explanatory purposes.
AB> Both gettable_event and settable_event use rawget to check
AB> the current value of the table, and rawget's description
AB> says:
>> index may be any value
AB> settable_event uses rawset to do the setting, and rawset's
AB> description says:
>> index [must be] any value different from nil
AB> See also <http://lua-users.org/lists/lua-l/2006-05/msg00378.html>.
--
Best regards,
Dmitriy mailto:iassenev@gsc-game.kiev.ua