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Xpetra_EpetraUtils.cpp
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46 #include "Xpetra_ConfigDefs.hpp"
47 
48 #ifdef HAVE_XPETRA_EPETRA
49 
50 #include "Xpetra_EpetraUtils.hpp"
51 
52 // header files for comm objects conversion
53 #ifdef HAVE_MPI
54 #include <mpi.h>
56 #include <Teuchos_OpaqueWrapper.hpp>
57 #endif
58 #include <Teuchos_DefaultSerialComm.hpp>
59 #ifdef HAVE_MPI
60 #include <Epetra_MpiComm.h>
61 #endif
62 #include <Epetra_SerialComm.h>
63 
64 #include "Xpetra_Exceptions.hpp"
65 
66 
67 namespace Xpetra {
68 
69  using Teuchos::RCP;
70 
71  const RCP<const Epetra_Comm> toEpetra(const RCP<const Teuchos::Comm<int> > & comm) {
72 #ifdef HAVE_MPI
73  const RCP<const Teuchos::MpiComm<int> > mpiComm = Teuchos::rcp_dynamic_cast<const Teuchos::MpiComm<int> >(comm);
74  if (mpiComm != Teuchos::null) {
75  return Teuchos::rcp(new Epetra_MpiComm(*mpiComm->getRawMpiComm()));
76  } else
77 #endif
78  if ((Teuchos::rcp_dynamic_cast<const Teuchos::SerialComm<int> >(comm) != Teuchos::null))
79  return Teuchos::rcp(new Epetra_SerialComm());
80  else
81  TEUCHOS_TEST_FOR_EXCEPTION(1,Xpetra::Exceptions::BadCast,"Cannot convert a Teuchos::Comm to an Epetra_Comm: The exact type of the Teuchos::Comm object is unknown");
82  }
83 
85 #ifdef HAVE_MPI
86  try {
87  const Epetra_MpiComm& mpiComm = dynamic_cast<const Epetra_MpiComm&>(comm);
88  // We need to pass some tag to the Teuchos::MpiComm constructor. We
89  // cannot use Epetra's GetMpiTag() as that increases the tag counter.
90  const int MAGIC_TAG = 26077;
91  return Teuchos::rcp(new Teuchos::MpiComm<int>(Teuchos::opaqueWrapper(mpiComm.Comm()), MAGIC_TAG));
92  } catch (std::bad_cast & /*b*/) {}
93 #endif
94  try {
95  const Epetra_SerialComm& serialComm = dynamic_cast<const Epetra_SerialComm&>(comm);
96  serialComm.NumProc(); // avoid compilation warning
98  } catch (std::bad_cast & /*b*/) {
99  TEUCHOS_TEST_FOR_EXCEPTION(1,Xpetra::Exceptions::BadCast,"Cannot convert an Epetra_Comm to a Teuchos::Comm: The exact type of the Epetra_Comm object is unknown");
100  }
101  }
102 
104  if (trans == Teuchos::NO_TRANS)
105  return false;
106  else if (trans == Teuchos::TRANS)
107  return true;
108  else {
109  TEUCHOS_TEST_FOR_EXCEPTION((trans != Teuchos::NO_TRANS) && (trans == Teuchos::TRANS), Xpetra::Exceptions::NotImplemented, "Cannot convert Teuchos::ETransp to a boolean.");
110  }
111 
112  return false; // to skip a compilation warning msg.
113  }
114 
115 }
116 
117 #endif
#define TEUCHOS_TEST_FOR_EXCEPTION(throw_exception_test, Exception, msg)
const Epetra_CrsGraph & toEpetra(const RCP< const CrsGraph< int, GlobalOrdinal, Node > > &graph)
Exception indicating invalid cast attempted.
TEUCHOS_DEPRECATED RCP< T > rcp(T *p, Dealloc_T dealloc, bool owns_mem)
MPI_Comm Comm() const
int NumProc() const
Exception throws when you call an unimplemented method of Xpetra.
RCP< const CrsGraph< int, GlobalOrdinal, Node > > toXpetra(const Epetra_CrsGraph &g)