glib/grand.h

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  28 #error "Only <glib.h> can be included directly."
  29 #endif
  30
  31 #ifndef __G_RAND_H__
  32 #define __G_RAND_H__
  33
  34 #include <glib/gtypes.h>
  35
  36 G_BEGIN_DECLS
  37
  38 typedef struct _GRand           GRand;
  39
  40 /* GRand - a good and fast random number generator: Mersenne Twister
  41  * see http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html for more info.
  42  * The range functions return a value in the intervall [begin, end).
  43  * int          -> [0..2^32-1]
  44  * int_range    -> [begin..end-1]
  45  * double       -> [0..1)
  46  * double_range -> [begin..end)
  47  */
  48
  49 GRand*  g_rand_new_with_seed  (guint32  seed);
  50 GRand*  g_rand_new_with_seed_array (const guint32 *seed,
  51                                     guint seed_length);
  52 GRand*  g_rand_new            (void);
  53 void    g_rand_free           (GRand   *rand_);
  54 GRand*  g_rand_copy           (GRand   *rand_);
  55 void    g_rand_set_seed       (GRand   *rand_,
  56                                guint32  seed);
  57 void    g_rand_set_seed_array (GRand   *rand_,
  58                                const guint32 *seed,
  59                                guint    seed_length);
  60
  61 #define g_rand_boolean(rand_) ((g_rand_int (rand_) & (1 << 15)) != 0)
  62
  63 guint32 g_rand_int            (GRand   *rand_);
  64 gint32  g_rand_int_range      (GRand   *rand_,
  65                                gint32   begin,
  66                                gint32   end);
  67 gdouble g_rand_double         (GRand   *rand_);
  68 gdouble g_rand_double_range   (GRand   *rand_,
  69                                gdouble  begin,
  70                                gdouble  end);
  71 void    g_random_set_seed     (guint32  seed);
  72
  73 #define g_random_boolean() ((g_random_int () & (1 << 15)) != 0)
  74
  75 guint32 g_random_int          (void);
  76 gint32  g_random_int_range    (gint32   begin,
  77                                gint32   end);
  78 gdouble g_random_double       (void);
  79 gdouble g_random_double_range (gdouble  begin,
  80                                gdouble  end);
  81
  82
  83 G_END_DECLS
  84
  85 #endif /* __G_RAND_H__ */