Re: Confirming silliness
- From: Mike Pall <mike-1503@xxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 10 Mar 2015 08:09:00 +0100
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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