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MPI_Comm_f2c(3)			   Open	MPI		       MPI_Comm_f2c(3)

NAME
       MPI_Comm_f2c,  MPI_Comm_c2f,  MPI_File_f2c, MPI_File_c2f, MPI_Info_f2c,
       MPI_Info_c2f, MPI_Op_f2c, MPI_Op_c2f, MPI_Request_f2c, MPI_Request_c2f,
       MPI_Type_f2c,  MPI_Type_c2f, MPI_Win_f2c, MPI_Win_c2f  -	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 ac-
       cess 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 IN-
       TEGER; usually, MPI_Fint	will be	equivalent to int. The handle transla-
       tion  functions	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 re-
       turns 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.

1.10.6				 Feb 17, 2017		       MPI_Comm_f2c(3)

NAME | SYNTAX | C Syntax | DESCRIPTION | NOTE

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