RE: Confirming silliness
- From: William Adams <william_a_adams@xxxxxxx>
- To: "luajit@xxxxxxxxxxxxx" <luajit@xxxxxxxxxxxxx>
- Date: Tue, 10 Mar 2015 19:37:38 +0000
silliness confirmed, my own that is.
I went back to just plain old strings in a table, and it magically works.
I could have sworn...
-- William
===============================
- Shaping clay is easier than digging it out of the ground.
> Date: Tue, 10 Mar 2015 08:09:00 +0100
> From: mike-1503@xxxxxxxxxx
> To: luajit@xxxxxxxxxxxxx
> Subject: Re: Confirming silliness
>
> William Adams wrote:
> > passing in the strings directly didn't seem to work in practice.
> > I don't think it can because the ffi needs to know what to cast
> > it to (variable arguments), and it doesn't know that from the
> > function signature. It could assume 'const char *', but that may
> > or may not be correct, and thus I explicitly cast.
>
> No, this works fine. The rules are explicitly stated here:
>
> http://luajit.org/ext_ffi_semantics.html#convert_vararg
>
> > and thus I explicitly cast.
>
> Sadly so. First, this creates dangling references, which is a bad
> thing to do. Lua strings are a perfectly fine way to store the
> content of, err, strings.
>
> Second, you could do the cast just before use to avoid the
> dangling reference. But, anyway, the cast is unnecessary.
>
> --Mike
>
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