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MPI_Comm_f2c(3OpenMPI)                                                                MPI_Comm_f2c(3OpenMPI)



NAME
       Handle translation routines  - Translates a C handle into a Fortran handle, or vice versa.


SYNTAX
C Syntax
       #include <mpi.h>
       MPI_Comm MPI_Comm_f2c(MPI_Fint comm)
       MPI_Fint MPI_Comm_c2f(MPI_Comm comm)

       MPI_File MPI_File_f2c(MPI_Fint file)
       MPI_Fint MPI_File_c2f(MPI_File file)

       MPI_Group MPI_Group_f2c(MPI Fint group)
       MPI_Fint MPI_Group_c2f(MPI Group group)

       MPI_Info MPI_Info_f2c(MPI_Fint info)
       MPI_Fint MPI_Info_c2f(MPI_Info info)

       MPI_Op MPI_Op_f2c(MPI_Fint op)
       MPI_Fint MPI_Op_c2f(MPI_Op op)

       MPI_Request MPI_Request_f2c(MPI_Fint request)
       MPI_Fint MPI_Request_c2f(MPI_Request request)

       MPI_Datatype MPI_Type_f2c(MPI_Fint datatype)
       MPI_Fint MPI_Type_c2f(MPI_Datatype datatype)

       MPI_Win MPI_Win_f2c(MPI_Fint win)
       MPI_Fint MPI_Win_c2f(MPI_Win win)


DESCRIPTION
       Handles  are  passed  between  Fortran and C or C++ by using an explicit C wrapper to convert Fortran
       handles to C handles. There is no direct access to C or C++ handles in Fortran.  Handles  are  passed
       between  C  and C++ using overloaded C++ operators called from C++ code. There is no direct access to
       C++ objects from C. The type definition MPI_Fint is provided in C/C++ for an integer of the size that
       matches  a Fortran INTEGER; usually, MPI_Fint will be equivalent to int. The handle translation func-tions functions
       tions are provided in C to convert from a Fortran handle (which is an integer) to  a  C  handle,  and
       vice versa.

       For example, if comm is a valid Fortran handle to a communicator, then MPI_Comm_f2c returns a valid C
       handle to that same communicator; if comm = MPI_COMM_NULL (Fortran value), then MPI_Comm_f2c  returns
       a null C handle; if comm is an invalid Fortran handle, then MPI_Comm_f2c returns an invalid C handle.

NOTE
       This function does not return an error value. Consequently, the result of calling it before  MPI_Init
       or after MPI_Finalize is undefined.






Open MPI 1.2                                   September 2006                         MPI_Comm_f2c(3OpenMPI)