Re: [Dev-luatex] user_defined whatsits - store function?

On 09/09/2010 07:17 PM, Patrick Gundlach wrote:

this is how I store the function:

n.value = string.dump(function() print("a") end)

and this is how I read it:

fun = assert(loadstring(head.value)) fun()

I guess that n.value "chokes" on \0 in strings.

Yes, and that is because internally the user_defined node has no room to store the string length in. I can fix that (later), but it is not intended usage and regardless it does not help you right now.

So any idea on how to store a function?

Put the functions in a global lua table and store the index to it? That allows upvalues, and faster too if the function is non-trivial. Best wishes, Taco