[Trilinos-Users] RCP Epetra_Vector

[Bartlett, Roscoe A.]

Antonella,

Use the function Teuchos::rcpFromRef():

     http://trilinos.org/docs/r11.10/packages/teuchos/doc/html/classTeuchos_1_1RCP.html#a6c754d72d6d232c97e38bc359ab6ef82

For example, if 'myVec' is an Epetra_Vector (or reference to an Epetra_Vector), use:

    const Teuchos::RCP<Epetra_Vector>  myVec_rcp = Teuchos::rcpFromRef(myVec);

(and the 'const' inside of <> if it is const).

Note that the new 'myVec_rcp' will *not* own the memory so you have to make sure that 'myVec' stays around long enough.  It is much safer to use:

    const Teuchos::RCP<Epetra_Vector> myVec_rcp(new Epetra_Vector(...));

and then replace myVec. something() with myVec_rcp->something() and 'myVec' with '*myVec_rcp' when passing to functions (i.e. like a pointer).

For issues associated with using rcpFromRef(), see the section "Converting from non-persisting to persisting references to satisfy the defined idioms" at:

     http://trilinos.org/docs/r11.10/packages/teuchos/doc/html/TeuchosMemoryManagementSAND.pdf

Cheers,

-Ross



> -----Original Message-----
> From: trilinos-users-bounces at software.sandia.gov [mailto:trilinos-users-
> bounces at software.sandia.gov] On Behalf Of Antonella Longo
> Sent: Wednesday, October 01, 2014 5:36 AM
> To: trilinos-users at software.sandia.gov
> Cc: Deepak Garg
> Subject: [Trilinos-Users] RCP Epetra_Vector
> 
> We are having an Epetra_Vector, and we want
> to change it into an RCP<Epetra_Vector> to
> use it in LSQR.
> Is there any way to make this conversion?
> 
> Deepak Garg and Antonella Longo
> 
> -----------------------------------------------
> Antonella Longo
> Istituto Nazionale di Geofisica e Vulcanologia
> Sezione di Pisa
> Via Uguccione della Faggiola, 32
> Pisa, Italy
> Tel. office: 050 8311939
> Cell.: 339 7532089
> 
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