Re: FFI newby question: importing C functions
- From: Daurnimator <quae@xxxxxxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 26 Jun 2012 06:33:38 +1000
On 26 June 2012 06:21, QuentinC <webmaster@xxxxxxxxxxxx> wrote:
> Infortunately, I need the standard round function missing from math table (I
> don't understand why they could have missed it in lua 5.1.4 but that's
> another topic). So I wrote that, but it doesn't work :
>
> ffi.cdef[[ double round (double); ]]
> function math.round (n)
> return ffi.C.round(n)
> end
>
>
> When I call this math.round function above, I get an error telling that the
> function can't be resolved.
>
> I have also tried to run this code directly in the interactive interpreter
> (luajit.exe), but the result is the same, so the problem don't appear to
> come from my host program.
>
> IN luajit 2.0.0.9, the error message was different: it said something like
> "can't resolve, but operation has succeeded".
>
> What's the problem ? What am I doing wrong ? What should I change to get it
> working ?
> Thank you very much for your help.
>
math functions are in the math library.
ffi.cdef[[ double round (double); ]]
Cmath = ffi.load"m"
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