Re: LuaMotif and Callbacks

[Miles Bader <miles@...>]

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.

-miles

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