.\" -*- nroff -*-
.\" Copyright 2010 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.\" $COPYRIGHT$
.TH MPI_Sizeof 3 "Sep 30, 2023" "4.1.6" "Open MPI"

.SH NAME
\fBMPI_Sizeof\fP \- Returns the size, in bytes, of the given type

.SH SYNTAX
.ft R

.SH Fortran Syntax
.nf
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_SIZEOF(\fIX, SIZE, IERROR\fP)
<type>	\fIX\fP
INTEGER	\fISIZE, IERROR\fP

.fi
.SH Fortran 2008 Syntax
.nf
USE mpi_f08
MPI_Sizeof(\fIx\fP, \fIsize\fP, \fIierror\fP)
	TYPE(*), DIMENSION(..) :: \fIx\fP
	INTEGER, INTENT(OUT) :: \fIsize\fP
	INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\fP

.fi
.SH INPUT PARAMETER
.ft R
.TP 1i
X
A Fortran variable of numeric intrinsic type (choice).

.SH OUTPUT PARAMETERS
.ft R
.TP 1i
SIZE
Size of machine representation of that type (integer).
.ft R
.TP 1i
IERROR
Error status (integer).

.SH DESCRIPTION
.ft R
MPI_SIZEOF returns the size (in bytes) of the machine representation
of the given variable. It is a generic Fortran type and has a Fortran
binding only. This routine is similar to the sizeof builtin in
C/C++. However, if given an array argument, it returns the size of the
base element, not the size of the whole array.

.SH NOTES
This function is not available in C/C++ because it is not necessary.

.SH ERRORS
.ft R
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.
.sp
See the MPI man page for a full list of MPI error codes.