Re: Arrays oddities
- From: Mike Pall <mike-1403@xxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Mon, 31 Mar 2014 11:51:55 +0200
Alain Meunier wrote:
> So basically anything my bytes[5] may be lost if the system need that memory
> space, right ?
Lost? No, it's a grave mistake to access out-of-bounds elements
and this may lead to crashes. Don't do it.
The FFI is like C: there's no hand-holding.
> Obviously it will not be the case with bytes[2] because it is in the bounds.
No, bytes[0] and bytes[1] are the only valid indexes.
I cannot recommend to use the FFI without a firm grasp of C's
memory model. E.g. zero-based indexing or the width of types
(an array of int cannot reasonably be called 'bytes').
> And this code is realistic enough to be used in production.
Oh dear.
--Mike
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