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lammps/src/lmptype.h
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lmptype.h
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
// define integer data types used by LAMMPS and associated size limits
// smallint = variables for on-procesor system (nlocal, nmax, etc)
// tagint = variables for atom IDs (tag)
// bigint = variables for total system (natoms, ntimestep, etc)
// smallint must be an int, as defined by C compiler
// tagint can be 32-bit or 64-bit int, must be >= smallint
// NOTE: 64-bit tagint is not yet supported
// bigint can be 32-bit or 64-bit int, must be >= tagint
// MPI_LMP_TAGINT = MPI data type corresponding to a tagint
// MPI_LMP_BIGINT = MPI data type corresponding to a bigint
// NOTE: if your machine/MPI does not support "long long" ints,
// but only "long" ints, then you will need to change
// MPI_LONG_LONG to MPI_LONG, and atoll to atol
#ifndef LMP_LMPTYPE_H
#define LMP_LMPTYPE_H
#define __STDC_LIMIT_MACROS
#define __STDC_FORMAT_MACROS
#include "limits.h"
#include "stdint.h"
#include "inttypes.h"
namespace LAMMPS_NS {
// default settings
// 32-bit smallint and tagint, 64-bit bigint
typedef int smallint;
typedef int tagint;
typedef int64_t bigint;
#define MAXSMALLINT INT_MAX
#define MAXTAGINT INT_MAX
#define MAXBIGINT INT64_MAX
#define MPI_LMP_TAGINT MPI_INT
#define MPI_LMP_BIGINT MPI_LONG_LONG
#define TAGINT_FORMAT "%d"
#define BIGINT_FORMAT "%" PRId64
#define ATOTAGINT atoi
#define ATOBIGINT atoll
// for molecular problems that exceed 2 billion (2^31) atoms
// 32-bit smallint, 64-bit tagint and bigint
// NOTE: 64-bit tagint is not yet supported
/*
typedef int smallint;
typedef int64_t tagint;
typedef int64_t bigint;
#define MAXSMALLINT INT_MAX
#define MAXTAGINT INT64_MAX
#define MAXBIGINT INT64_MAX
#define MPI_LMP_TAGINT MPI_LONG_LONG
#define MPI_LMP_BIGINT MPI_LONG_LONG
#define TAGINT_FORMAT "%" PRId64
#define BIGINT_FORMAT "%" PRId64
#define ATOTAGINT atoll
#define ATOBIGINT atoll
*/
// for machines that do not support 64-bit ints
// 32-bit smallint and tagint and bigint
/*
typedef int smallint;
typedef int tagint;
typedef int bigint;
#define MAXSMALLINT INT_MAX
#define MAXTAGINT INT_MAX
#define MAXBIGINT INT_MAX
#define MPI_LMP_TAGINT MPI_INT
#define MPI_LMP_BIGINT MPI_INT
#define TAGINT_FORMAT "%d"
#define BIGINT_FORMAT "%d"
#define ATOTAGINT atoi
#define ATOBIGINT atoi
*/
}
#endif
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