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What type is "function" for tolua?

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Hi!
Consider the following cleaned class, in sample.pkg:
class Sample{
 Sample();
 ~Sample();
 void SetCallback( t_function f );// what type is correct to get a 
Lua function pointer?
}
In Lua, I would like to do this:
function test()
...
end
sample = Sample:new()
sample:SetCallback(test)
That's the point! In C++, what type is "t_function"?
And how to store the address of the parameter (a function) in C++, to 
call it later?
I know how to do all this in pure Lua, but using tolua (a great tool)
I don't know how!!!

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