Re: LuaMotif and Callbacks

[Marc Balmer <marc@...>]

Am 07.04.12 11:27, schrieb Miles Bader:
> 2012年4月7日17:43 Marc Balmer <marc@msys.ch>:
>>> Why can't you just make the callback a closure, and reference "data"
>>> directly from it (without making it a parameter)?
>>
>> I am using it in a loop, e.g. like this:
> ...
>>                        activateCallback = Callback {
>>                                item[2], -- the function
>>                                item[3]  -- data to be passed
>>                        }
> ...
>> So I think a closure would not work here?
> 
> Not sure why not (though maybe I misunderstand your problem).
> 
> A closure captures bindings, and Lua's for loop creates new bindings
> for the loop variables on each entry into the loop body.
> 
> So a closure like:
> 
>    activeCallback = function () item[2] (item[3]) end
> 
> should do the right thing.

I tried it.  It does not work.