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.\" -*- nroff -*-
.\" Copyright 2010 Cisco Systems, Inc. All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.\" $COPYRIGHT$
.TH MPI_Comm_group 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.SH NAME
\fBMPI_Comm_group \fP \- Returns the group associated with a communicator.
.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Comm_group(MPI_Comm \fIcomm\fP, MPI_Group *\fIgroup\fP)
.fi
.SH Fortran Syntax
.nf
INCLUDE 'mpif.h'
MPI_COMM_GROUP(\fICOMM, GROUP, IERROR\fP)
INTEGER \fICOMM, GROUP, IERROR\fP
.fi
.SH C++ Syntax
.nf
#include <mpi.h>
Group Comm::Get_group() const
.fi
.SH INPUT PARAMETER
.ft R
.TP 1i
comm
Communicator.
.SH OUTPUT PARAMETERS
.ft R
.TP 1i
group
Group in communicator (handle).
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer).
.SH DESCRIPTION
.ft R
If the communicator is an intercommunicator (enables communication between two groups of processes), this function returns the local group. To return the remote group, use the MPI_Comm_remote_group function.
.SH 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.
.sp
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.
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