.\" -*- nroff -*-
.\" Copyright (c) 2010-2014 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines
.\" $COPYRIGHT$
.TH MPI_Type_delete_attr 3 "Sep 30, 2023" "4.1.6" "Open MPI"
.SH NAME
\fBMPI_Type_delete_attr\fP \- Deletes a datatype-caching attribute value associated with a key.

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Type_delete_attr(MPI_Datatype \fItype\fP, int \fItype_keyval\fP)

.fi
.SH Fortran Syntax
.nf
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_TYPE_DELETE_ATTR(\fITYPE, TYPE_KEYVAL, IERROR\fP)
	INTEGER	\fITYPE, TYPE_KEYVAL, IERROR \fP

.fi
.SH Fortran 2008 Syntax
.nf
USE mpi_f08
MPI_Type_delete_attr(\fIdatatype\fP, \fItype_keyval\fP, \fIierror\fP)
	TYPE(MPI_Datatype), INTENT(IN) :: \fIdatatype\fP
	INTEGER, INTENT(IN) :: \fItype_keyval\fP
	INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\fP

.fi
.SH C++ Syntax
.nf
#include <mpi.h>
void MPI::Datatype::Delete_attr(int \fItype_keyval\fP)

.fi
.SH INPUT/OUTPUT PARAMETER
.ft R
.TP 1i
type
Data type from which the attribute is deleted (handle).n

.SH INPUT PARAMETER
.ft R
.TP 1i
type_keyval
Key value (integer).

.SH OUTPUT PARAMETER
.ft R
.TP 1i
IERROR
Fortran only: Error status (integer).

.SH DESCRIPTION
.ft R
MPI_Type_delete_attr deletes a datatype-caching attribute value associated with a key. This routines partially replaces MPI_Attr_delete, which is now deprecated.


.SH NOTES
Note that it is not defined by the MPI standard what happens if the
delete_fn callback invokes other MPI functions.  In Open MPI, it is
not valid for delete_fn callbacks (or any of their children) to add or
delete attributes on the same object on which the delete_fn callback
is being invoked.


.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.