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MPI_Type_dup - Duplicates a data type with associated key values.
#include <mpi.h>
int MPI_Type_dup(MPI_Datatype type, MPI_Datatype *newtype)
INCLUDE ’mpif.h’
MPI_TYPE_DUP(TYPE, NEWTYPE, IERROR)
INTEGER TYPE, NEWTYPE, IERROR
#include <mpi.h>
MPI::Datatype MPI::Datatype::Dup() const
- type
- Data type (handle).
- newtype
- Copy of
type (handle).
- IERROR
- Fortran only: Error status (integer).
MPI_Type_dup
is a type constructor that duplicates the existing type with associated
key values. For each key value, the respective copy callback function determines
the attribute value associated with this key in the new communicator. One
particular action that a copy callback may take is to delete the attribute
from the new data type. Returns in newtype a new data type with exactly
the same properties as type, as well as any copied cached information. The
new data type has identical upper bound and lower bound and yields the
same net result when fully decoded with the functions described in Section
8.6 of the MPI-2 standard. newtype has the same committed state as the old
type.
Note that it is not defined by the MPI standard what happens
if the attribute copy callback invokes other MPI functions. In Open MPI,
it is not valid for attribute copy callbacks (or any of their children)
to add or delete attributes on the same object on which the attribute copy
callback is being invoked.
Almost all MPI routines return an error
value; C routines as the value of the function and Fortran routines in
the last argument. C++ functions do not return errors. If the default error
handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception
mechanism will be used to throw an MPI::Exception object.
Before the error
value is returned, the current MPI error handler is called. By default,
this error handler aborts the MPI job, except for I/O function errors. The
error handler may be changed with MPI_Comm_set_errhandler; the predefined
error handler MPI_ERRORS_RETURN may be used to cause error values to be
returned. Note that MPI does not guarantee that an MPI program can continue
past an error.
MPI_Type_create_keyval
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