* how do I create my own callback functions with return value?

[Ron Melby]

I have never done anything like this, and I am not conversant enough and there are no examples I can find to do this.

I need to call or pcall a callback function defined in your program and get a return value

rtx = cb_io_3(k, v)

the internals of the callback decision are unimportant at the moment, but are based on data you send in to call my program
you may have 0 to any number of callbacks for this io and it is based on fields you supply therefore
you may have
cb_io_1
cb_io_2
cb_io_3
cb_io_n


['mtx_fn'] =
{
[3] =
{
(function = cb_io_[ix](k, v) end, }
-- how do I pcall
--how do I get the function return 'o' or 'io'
end),
}

I can get nothing on this order to compile:

['mtx_fn'] = {[3] = function = ((rtx) = cb_io_[ix](k, v} end))},

so -- is it like---?
my first example
in my entry
and I code
rtx = ['mtx_fn]()

and your callback looks something like

function cb_io_3( k, v)
--some such nonsense to return a value
if alwchg = '0' then
return 'o'
else
return 'io'
end
end

what other things should I be doing to make it work?

[ColeValleyGirl]

Have the callback functions as parameters to your function.

[Ron Melby]

I dont understand that, nor how to do that, at least not that I know of, can you elucidate, Helen? Thanks.

[Ron Melby]

oh wait....
k = key
v = val
rtx = ''
you mean
cb_io_[ix-](k, v, rtx) end

and then use rtx after the callback, right?

[ColeValleyGirl]

Code: Select all

function X (doStuff)
[snip]
doStuff(some parameters that match the requirements of doStuff)
[snip]
end

function doSomething()
--do something
end

X(doSomething)

You can add extra parameters to the call on X