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.