Seg fault when calling C code

[Andrew Brown via Digitalmars-d-learn]

That worked a treat! Thank you very much!

On Thursday, 15 May 2014 at 21:11:54 UTC, Ali Çehreli wrote:
> On 05/15/2014 01:55 PM, Andrew Brown wrote:
> > extern(C) {
> >    void regress(int nInd, int nCov, ref double[] x, ref
> double[] y, ref
> > double[] rOut);
> > }
>
> I don't think that should even be allowed. C functions should 
> not know or be compatible with 'ref' D parameters. Define the 
> arguments as simple 'double *' or 'const double *'.
>
> That makes sense because your C function is defined that way 
> anyway.
>
> > void main(){
> >    int nInd = 5;
> >    int nCov = 3;
> >    double[] x = new double[nCov * nInd];
> // ...
> >    regress(5, 3, x, y, residuals);
>
> You want to pass the address of the first array member: x.ptr 
> (&(x[0]) would work as well). (Same for y.)
>
> Otherwise, what ends up happening is that the address of the x 
> and y slices are passed and C has no idea of what that is.
>
> Ali