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NAME
MPI_Type_get_contents - Returns information about arguments used in
creation of a data type.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Type_get_contents(MPI_Datatype datatype, int max_integers,
int max_addresses, int max_datatypes, int array_of_integers[], MPI_Aint array_of_addresses[], MPI_Datatype array_of_datatypes[])
Fortran Syntax (see FORTRAN 77 NOTES)
INCLUDE 'mpif.h'
MPI_TYPE_GET_CONTENTS(DATATYPE, MAX_INTEGERS, MAX_ADDRESSES,
MAX_DATATYPES, ARRAY_OF_INTEGERS, ARRAY_OF_ADDRESSES,
ARRAY_OF_DATATYPES, IERROR)
INTEGER DATATYPE, MAX_INTEGERS, MAX_ADDRESSES, MAX_DATATYPES
INTEGER ARRAY_OF_INTEGERS(*), ARRAY_OF_DATATYPES(*), IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) ARRAY_OF_ADDRESSES(*)
C++ Syntax
#include <mpi.h>
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
INPUT PARAMETERS
datatype Data type to access (handle).
max_integers
Number of elements in array_of_integers (nonnegative inte-
ger).
max_addresses
Number of elements in array_of_addresses (nonnegative inte-
ger).
max_datatypes
Number of elements in array_of_datatypes (nonnegative inte-
ger).
OUTPUT PARAMETERS
array_of_integers
Contains integer arguments used in constructing datatype
(array of integers).
array_of_addresses
Contains address arguments used in constructing datatype
(array of integers).
array_of_datatypes
Contains data-type arguments used in constructing datatype
(array of integers).
provide sufficiently large arrays in the decoding routine
MPI_Type_get_contents. This call and the meaning of the returned values
is described below. The combiner reflects the MPI data type constructor
call that was used in creating datatype.
The parameter datatype must be a predefined unnamed or a derived data
type. The call is erroneous if datatype is a predefined named data
type.
The values given for max_integers, max_addresses, and max_datatypes
must be at least as large as the value returned in num_integers,
num_addresses, and num_datatypes, respectively, in the call
MPI_Type_get_envelope for the same datatype argument.
The data types returned in array_of_datatypes are handles to data-type
objects that are equivalent to the data types used in the original con-
struction call. If these were derived data types, then the returned
data types are new data-type objects, and the user is responsible for
freeing these datatypes with MPI_Type_free. If these were predefined
data types, then the returned data type is equal to that (constant)
predefined data type and cannot be freed.
The committed state of returned derived data types is undefined, that
is, the data types may or may not be committed. Furthermore, the con-
tent of attributes of returned data types is undefined.
Note that MPI_Type_get_contents can be invoked with a data-type argu-
ment that was constructed using MPI_Type_create_f90_real, MPI_Type_cre-
ate_f90_integer, or MPI_Type_create_f90_complex (an unnamed predefined
data type). In such a case, an empty array_of_datatypes is returned.
In the MPI-1 data-type constructor calls, the address arguments in For-
tran are of type INTEGER. In the new MPI-2 calls, the address arguments
are of type INTEGER(KIND=MPI ADDRESS KIND). The call MPI_Type_get_con-
tents returns all addresses in an argument of type INTEGER(KIND=MPI
ADDRESS KIND). This is true even if the old MPI-1 calls were used.
Thus, the location of values returned can be thought of as being
returned by the C bindings. It can also be determined by examining the
new MPI-2 calls for data-type constructors for the deprecated MPI-1
calls that involve addresses.
FORTRAN 77 NOTES
The MPI standard prescribes portable Fortran syntax for the
ARRAY_OF_ADDRESSES argument only for Fortran 90. FORTRAN 77 users may
use the non-portable syntax
INTEGER*MPI_ADDRESS_KIND ARRAY_OF_ADDRESSES(*)
where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives the
length of the declared integer in bytes.
ERRORS
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument. C++ func-
tions do not return errors. If the default error handler is set to
MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
SEE ALSO
MPI_Type_get_envelope
1.3.4 Nov 11, 2009 MPI_Type_get_contents(3)
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