defining swap

[Jonas Meyer <jonas.meyer@...>]

Hi.

I'm having trouble defining a method similar to std::swap from c++, as
it seems all parameters are passed by-value.
I need to swap two userdata objects, defined via luabind. Each of the
objects contain one pointer.. so I really just want to swap the
pointers contained inside the objects


Is there any way to solve this? My best bet, so far, is using a global
table something like this:

tab={}
function TableSwap( a, b )
  tab[ a ], tab[ b ] = tab[ b ], tab[ a ]
end

...
tab[ 0 ] = foo
tab[ 1 ] = bar
TableSwap( 0, 1 )

But it seems cumbersome, and I was hoping there was some other way to solve it.

-- 
Jonas Meyer
meyer@diku.dk