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Programming Lua - Functions, parameters "..."

 
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Filipe_Br
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PostPosted: Wed Feb 08, 2017 2:20 pm    Post subject: Programming Lua - Functions, parameters "..." Reply with quote
It is as follows, you can create a function like this:
Code:
function test_function(...)

Code:
function test_function(param1, ...)

And you can pass this as a parameter:
Code:
print(...)

But after all what is this "..." and how is it used.
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ParkourPenguin
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PostPosted: Wed Feb 08, 2017 3:25 pm    Post subject: Reply with quote
Basic explanation:
https://www.lua.org/pil/5.2.html

Formal explanation:
http://www.lua.org/manual/5.3/manual.html#3.4.11

Even if you don't understand English that well, you should be able to mess around with the provided examples to get a basic comprehension.
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Filipe_Br
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PostPosted: Wed Feb 08, 2017 4:17 pm    Post subject: Reply with quote
I did not get anything, I do not understand what is wrong. Could you show a simple example of a function and a function call using this?
Because I try to catch the examples most of the mistake.
I tried to write that too, but also the error.
Code:
function g(...)
 print(arg[1])
end
g(10, 20, 24)

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ParkourPenguin
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PostPosted: Wed Feb 08, 2017 4:26 pm    Post subject: Reply with quote
Oops. That version of PIL was written for Lua 5.0. Seems like the implementation has changed since 5.1 (CE uses 5.3).

For a quick workaround, use this:
Code:
function g(...)
  local arg = {...}  -- arg is now a table of all extra values passed to g
  print(arg[1])
end
g(10, 20, 24)

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Filipe_Br
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PostPosted: Wed Feb 08, 2017 4:31 pm    Post subject: Reply with quote
Thank you, until the end I know how to use it.
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Zanzer
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PostPosted: Wed Feb 08, 2017 6:45 pm    Post subject: Reply with quote
http://lua-users.org/wiki/VarargTheSecondClassCitizen
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