suggestion for Timer.delayedCall

alexzheng · May 2012

It's a very handy function, will it support to call mutiple arguments function in future version?

for example

function test(a, b, c)
print(a, b, c)
end

Timer.delayedCall(1000, test, 1, 2, 3)

ndoss · May 2012

You could make your own while you wait for Atilim:

Timer._originalDelayedCall = Timer.delayedCall
Timer.delayedCall = function(delay, func, ...)
   Timer._originalDelayedCall(delay, function() func(unpack(arg)) end)
end

OZApps · May 2012

isn't that similar to another API from the Mexican Beer, that is timer.performWithDelay(delay, function)

alexzheng · May 2012

You could make your own while you wait for Atilim:

Timer._originalDelayedCall = Timer.delayedCall
Timer.delayedCall = function(delay, func, ...)
   Timer._originalDelayedCall(delay, function() func(unpack(arg)) end)
end

great,thanks!
Is arg deprecated?

ndoss · May 2012

http://www.luafaq.org/#T1.23

I think the way I used it is not deprecated, but according to the faq it's not robust in the case where one if the arguments is nil?

petec · May 2012

I've always used this sort of thing when I want to include arguemnts in a delayed call:

function test(a, b, c)
    print(a, b, c)
end
 
Timer.delayedCall(1000, function() test(1, 2, 3) end)

Might that cause a problem too? If I miss the final argument it prints 1 2 nil.

alexzheng · May 2012

http://www.luafaq.org/#T1.23

I think the way I used it is not deprecated, but according to the faq it's not robust in the case where one if the arguments is nil?

I got a little confused whether it is safe to use arg?

From this thread, he said arg does not work in lua 5.2,although it works in 5.1

http://stackoverflow.com/questions/9786051/getting-arg-to-work-in-a-varag-function-in-lua-5-2-integrated-in-delphi

ndoss · May 2012

Your link is a little clearer than mine...it does look deprecated

alexzheng · May 2012

so, will this be safe?

Timer._originalDelayedCall = Timer.delayedCall
Timer.delayedCall = function(delay, func, ...)
   local arg = {...}
   Timer._originalDelayedCall(delay, function() func(unpack(arg)) end)
end

ndoss · May 2012

@alexzheng, your approach works for me and handles nils. I also saw the "{n=select('#',...),...}" construct used and recommended (see below). Don't know which is best / future-proof?

Timer.oldDelayedCall = Timer.delayedCall
Timer.delayedCall = function(delay, func, ...)
   local arg = {n=select('#', ...), ...}
   Timer.oldDelayedCall(delay, function() func(unpack(arg)) end)
end
 
function test(data1, data2, data3, data4) 
   print("GOT DATA:" , data1, data2, data3, data4)
end
 
Timer.delayedCall(4000, test, 4, 5, nil, "hello")

Magnusviri · May 2012

Very cool stuff, thanks for figuring this all out.

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