[petsc-users] Passing DMMG struct.

[Barry Smith]

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