[Trilinos-Users] tpetra::crsmatrix -> xpetra::matrix

[Nico Schlömer]

I see now there is `MueLu::TpetraCrs_To_XpetraMatrix`, but it doesn't
work for `const Tpetra::CrsMatrix`. :(

--Nico

On Thu, Oct 29, 2015 at 1:53 AM, Nico Schlömer <nico.schloemer at gmail.com> wrote:
> Can anyone please assist me with converting a `const Tpetra::CrsMatrix` into
> something that I can stuff into this
> ```
> H->GetLevel(0)->Set("A", something);
> ```
> I played around for two hours now and ended up with
> ```
>   Teuchos::RCP<const Tpetra::CrsMatrix<double,int,int>> ATpetra =
>     Teuchos::rcpFromRef(A);
>   auto tmp = Xpetra::TpetraCrsMatrix<double,int,int>(ATpetra);
>   auto AXpetra = Teuchos::rcpFromRef(tmp);
>   auto AXpetraWrap = Teuchos::rcp(new Xpetra::CrsMatrixWrap(AXpetra));
> ```
> which isn't working at all. Yikes, this is really complex.
>
> As a side node, I would really appreciate const-reference interfaces. I find
> myself doing the `Teuchos::rcpFromRef()` dance all the time, only to
> dereference the objects later again.
>
> Cheers,
> Nico
>
> PS: I would have written to the MueLu users' list, but I couldn't find it
> anywhere.