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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_Info_get_nthkey 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.SH NAME
\fBMPI_Info_get_nthkey\fP \- Returns the \fIn\fPth defined key in \fIinfo\fP.
.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Info_get_nthkey(MPI_Info \fIinfo\fP, int \fIn\fP, char \fI*key\fP)
.fi
.SH Fortran Syntax
.nf
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_INFO_GET_NTHKEY(\fIINFO, N, KEY, IERROR\fP)
INTEGER \fIINFO, N, IERROR\fP
CHARACTER*(*) \fIKEY\fP
.fi
.SH Fortran 2008 Syntax
.nf
USE mpi_f08
MPI_Info_get_nthkey(\fIinfo\fP, \fIn\fP, \fIkey\fP, \fIierror\fP)
TYPE(MPI_Info), INTENT(IN) :: \fIinfo\fP
INTEGER, INTENT(IN) :: \fIn\fP
CHARACTER(LEN=*), INTENT(OUT) :: \fIkey\fP
INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\fP
.fi
.SH C++ Syntax
.nf
#include <mpi.h>
void MPI::Info::Get_nthkey(int \fIn\fP, char* \fIkey\fP) const
.fi
.SH INPUT PARAMETERS
.ft R
.TP 1i
info
Info object (handle).
.ft R
.TP 1i
n
Key number (integer).
.SH OUTPUT PARAMETERS
.ft R
.TP 1i
key
Key (string).
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer).
.SH DESCRIPTION
.ft R
MPI_Info_get_nthkey returns the \fIn\fPth defined key in \fIinfo\fP. Keys are numbered 0\...\fIN\fP - 1 where \fIN\fP is the value returned by MPI_Info_get_nkeys. All keys between 0 and \fIN\fP - 1 are guaranteed to be defined. The number of a given key does not change as long as \fIinfo\fP is not modified with MPI_Info_set or MPI_Info_delete.
.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.
.SH SEE ALSO
.ft r
MPI_Info_get
.br
MPI_Info_get_nkeys
.br
MPI_Info_get_valuelen
.br
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