[petsc-users] Passing DMMG struct.

[Chris Bording]

I made the change in the function so I now get this error
PetscErrorCode ComputeRho(DMMG *dmmg, Vec rho)
{
 DA             distA = (DA)dmmg->dm;

In function ‘PetscErrorCode Myfunc(_n_DMMG**, _p_Vec*)’:
error: request for member ‘dm’ in ‘* dmmg’, which is of non-class type
‘_n_DMMG*’

It looks like I have a null pointer to _n_DMMG**  instead of _n_DMMG*

Chris



On Mon, Nov 22, 2010 at 1:34 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
> On Nov 22, 2010, at 3:23 PM, Chris Bording wrote:
>
> > Hi I am trying to pass the DMMG struct to a function similar to what is
> in the examples.
> >
> > extern PetscErrorCode Myfunc(DMMG,Vec);
> >
> >
> > int main(int argc,char **argv)
> > {
> >   DMMG           *dmmg;
>                           ^^^^^^ Note this
> > ...Vec b;
> >
> > Myfunc(dmmg,b)
> > }
> >
> > PetscErrorCode Myfunc(DMMG *dmmg, Vec b)
>                                                              ^^^   add this
>
> > {
> >   DA             da = (DA)dmmg->dm;
> > .....
> > }
> >
> > error: cannot convert ‘_n_DMMG**’ to ‘_n_DMMG*’ for argument ‘1’ to
> ‘PetscErrorCode Myfunc(_n_DMMG*, _p_Vec*)
> >
> > So how do I pass a DMMG defined structure into my function?
> >
> >
> >
> > Thanks
> > Chris
>
>
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