NAME

       MPI_Type_contiguous - Creates a contiguous datatype.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Type_contiguous(int count, MPI_Datatype oldtype,
            MPI_Datatype *newtype)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_TYPE_CONTIGUOUS(COUNT, OLDTYPE, NEWTYPE, IERROR)
            INTEGER   COUNT, OLDTYPE, NEWTYPE, IERROR

C++ Syntax

       #include <mpi.h>
       Datatype Datatype::Create_contiguous(int count) const

INPUT PARAMETERS

       count     Replication count (nonnegative integer).

       oldtype   Old datatype (handle).

OUTPUT PARAMETERS

       newtype   New datatype (handle).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       The  simplest  datatype  constructor  is MPI_Type_contiguous, which allows replication of a datatype into
       contiguous locations.

       newtype is the datatype obtained by concatenating count copies of oldtype. Concatenation is defined using
       the extent of oldtype as the size of the concatenated copies.

       Example:  Let oldtype have type map {(double, 0), (char, 8)}, with extent 16, and let count = 3. The type
       map of the datatype returned by newtype is

           {(double, 0), (char, 8), (double, 16), (char, 24),
           (double, 32), (char, 40)];

       i.e., alternating double and char elements, with displacements 0, 8, 16, 24, 32, 40.

       In general, assume that the type map of oldtype is

           {(type(0), disp(0)),...,(type(n-1), disp(n-1))},

       with extent ex. Then newtype has a type map with count times n entries defined by:

           {(type(0), disp(0)), ...,(type(n-1), disp(n-1)),
           (type(0), disp(0) + ex), ...,(type(n-1),
           disp(n-1) + ex), ...,(type(0), disp(0) + ex * (count - 1)),
           ...,(type(n-1), disp(n-1) + ex * (count - 1))}.

       For more information about derived datatypes, see Section 3.12 of the MPI-1 Standard.

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++ 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.