libguile/boolean.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM_BOOLEAN_H
   4 #define SCM_BOOLEAN_H
   5
   6 /* Copyright (C) 1995,1996,2000 Free Software Foundation, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this software; see the file COPYING.  If not, write to
  20  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  21  * Boston, MA 02111-1307 USA
  22  *
  23  * As a special exception, the Free Software Foundation gives permission
  24  * for additional uses of the text contained in its release of GUILE.
  25  *
  26  * The exception is that, if you link the GUILE library with other files
  27  * to produce an executable, this does not by itself cause the
  28  * resulting executable to be covered by the GNU General Public License.
  29  * Your use of that executable is in no way restricted on account of
  30  * linking the GUILE library code into it.
  31  *
  32  * This exception does not however invalidate any other reasons why
  33  * the executable file might be covered by the GNU General Public License.
  34  *
  35  * This exception applies only to the code released by the
  36  * Free Software Foundation under the name GUILE.  If you copy
  37  * code from other Free Software Foundation releases into a copy of
  38  * GUILE, as the General Public License permits, the exception does
  39  * not apply to the code that you add in this way.  To avoid misleading
  40  * anyone as to the status of such modified files, you must delete
  41  * this exception notice from them.
  42  *
  43  * If you write modifications of your own for GUILE, it is your choice
  44  * whether to permit this exception to apply to your modifications.
  45  * If you do not wish that, delete this exception notice.  */
  46
  47 \f
  48
  49 #include "libguile/__scm.h"
  50
  51 \f
  52
  53 /* Boolean Values
  54  *
  55  */
  56 #define SCM_FALSEP(x)           (SCM_EQ_P ((x), SCM_BOOL_F))
  57 #define SCM_NFALSEP(x)          (!SCM_FALSEP (x))
  58
  59 #define SCM_BOOLP(x)            (SCM_EQ_P ((x), SCM_BOOL_F) || SCM_EQ_P ((x), SCM_BOOL_T))
  60
  61 /* Convert from a C boolean to a SCM boolean value */
  62 #define SCM_BOOL(f)             ((f) ? SCM_BOOL_T : SCM_BOOL_F)
  63
  64 /* Convert from a C boolean to a SCM boolean value and negate it */
  65 #define SCM_NEGATE_BOOL(f)      ((f) ? SCM_BOOL_F : SCM_BOOL_T)
  66
  67 /* SCM_BOOL_NOT returns the other boolean.
  68  * The order of ^s here is important for Borland C++ (!?!?!)
  69  */
  70 #define SCM_BOOL_NOT(x)         (SCM_PACK (SCM_UNPACK (x) \
  71                                            ^ (SCM_UNPACK (SCM_BOOL_T) \
  72                                               ^ SCM_UNPACK (SCM_BOOL_F))))
  73
  74 \f
  75
  76 extern SCM scm_not (SCM x);
  77 extern SCM scm_boolean_p (SCM obj);
  78 extern void scm_init_boolean (void);
  79
  80 #endif  /* SCM_BOOLEAN_H */
  81
  82 /*
  83   Local Variables:
  84   c-file-style: "gnu"
  85   End:
  86 */