Re: 5.2: equality for closures
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- Subject: Re: 5.2: equality for closures
- From: Sean Conner <sean@...>
- Date: 2011年6月28日 17:57:35 -0400
It was thus said that the Great Lorenzo Donati once stated:
>
> BTW, I have also wondered why (full) userdata creation is only possible
> from C API. Wouldn't it be possible to devise a safe way to define and
> manage userdata from Lua? It could be useful for lots of things (maybe a
> bit advanced, but no more than those of "goto"), without resorting to C,
> therefore pushing farther the boundary where Lua could be used instead
> of C (leaving C only for high performance tasks or very tight system
> integration/communication).
Could you give an example of what you mean? From my perspective, a
userdata is typically a C structure, alignment of fields dependant upon the
architecture. A structure like:
struct foo
{
char c;
int i;
char *s;
}
could be anywhere from 5 bytes (say, from a C compiler for a 6809 or 8088)
to 24 bytes (a modern 64-bit system), with each field at a different offset
from the base address of the structure.
-spc (In other words, I don't quite understand what you're asking for)