Fix from an as-yet uncommitted test that Pak will commit shortly.

Found another places that we were incorrectly casting a C++ MPI handle
array to the corresponding C array type and hoping for the best (which
won't work at all).  This commit fixes things so that we now do the
proper conversion between C<-->C++ handles.

This commit was SVN r13346.

ompi/mpi/cxx/datatype_inln.h

@@ -217,15 +217,22 @@ MPI::Datatype::Get_attr(int type_keyval,
 
 inline void
 MPI::Datatype::Get_contents(int max_integers, int max_addresses,
-				   int max_datatypes, int array_of_integers[],
-				   MPI::Aint array_of_addresses[],
-				   MPI::Datatype array_of_datatypes[])
-  const
+                            int max_datatypes, int array_of_integers[],
+                            MPI::Aint array_of_addresses[],
+                            MPI::Datatype array_of_datatypes[]) const
 {
-  (void) MPI_Type_get_contents(mpi_datatype, max_integers, max_addresses,
-			       max_datatypes, const_cast<int *>(array_of_integers), 
-			       const_cast<MPI_Aint*>(array_of_addresses),
-			       (MPI_Datatype *)(array_of_datatypes));
+    int i;
+    MPI_Datatype *d = new MPI_Datatype[max_datatypes];
+    
+    (void) MPI_Type_get_contents(mpi_datatype, max_integers, max_addresses,
+                                 max_datatypes, 
+                                 const_cast<int *>(array_of_integers), 
+                                 const_cast<MPI_Aint*>(array_of_addresses), d);
+    // Convert the C MPI_Datatypes to the user's OUT MPI::Datatype
+    // array parameter
+    for (i = 0; i < max_datatypes; ++i) {
+        array_of_datatypes[i] = d[i];
+    }
 }
 
 inline void