gsl_mode.h

该文件为c++的数学函数库!是一个非常有用的编程工具.它含有各种数学函数,为科学计算、工程应用等程序编写提供方便！

/* gsl_mode.h
 * 
 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Author:  B. Gough and G. Jungman */

#ifndef __GSL_MODE_H__
#define __GSL_MODE_H__

#undef __BEGIN_DECLS
#undef __END_DECLS
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS /* empty */
# define __END_DECLS /* empty */
#endif

__BEGIN_DECLS


/* Some functions can take a mode argument. This
 * is a rough method to do things like control
 * the precision of the algorithm. This mainly
 * occurs in special functions, but we figured
 * it was ok to have a general facility.
 *
 * The mode type is 32-bit field. Most of
 * the fields are currently unused. Users
 * '|' various predefined constants to get
 * a desired mode.
 */
typedef unsigned int gsl_mode_t;


/* Here are the predefined constants.
 * Note that the precision constants
 * are special because they are used
 * to index arrays, so do not change
 * them. The precision information is
 * in the low order 3 bits of gsl_mode_t
 * (the third bit is currently unused).
 */

/* Note that "0" is double precision,
 * so that you get that by default if
 * you forget a flag.
 */
#define GSL_PREC_DOUBLE  0
#define GSL_PREC_SINGLE  1
#define GSL_PREC_APPROX  2

#if HAVE_INLINE
extern inline unsigned int GSL_MODE_PREC(gsl_mode_t mt);

extern inline unsigned int
GSL_MODE_PREC(gsl_mode_t mt)
{ return  (mt & (unsigned int)7); }
#else  /* HAVE_INLINE */
#define GSL_MODE_PREC(mt) ((mt) & (unsigned int)7)
#endif /* HAVE_INLINE */


/* Here are some predefined generic modes.
 */
#define GSL_MODE_DEFAULT  0


__END_DECLS

#endif /* __GSL_MODE_H__ */