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 library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library 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 GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 \f
  24
  25 #include "libguile/__scm.h"
  26
  27 \f
  28
  29 /* Boolean Values
  30  *
  31  */
  32 #define SCM_FALSEP(x)           (SCM_EQ_P ((x), SCM_BOOL_F))
  33 #define SCM_NFALSEP(x)          (!SCM_FALSEP (x))
  34
  35 #define SCM_BOOLP(x)            (SCM_EQ_P ((x), SCM_BOOL_F) || SCM_EQ_P ((x), SCM_BOOL_T))
  36
  37 /* Convert from a C boolean to a SCM boolean value */
  38 #define SCM_BOOL(f)             ((f) ? SCM_BOOL_T : SCM_BOOL_F)
  39
  40 /* Convert from a C boolean to a SCM boolean value and negate it */
  41 #define SCM_NEGATE_BOOL(f)      ((f) ? SCM_BOOL_F : SCM_BOOL_T)
  42
  43 /* SCM_BOOL_NOT returns the other boolean.
  44  * The order of ^s here is important for Borland C++ (!?!?!)
  45  */
  46 #define SCM_BOOL_NOT(x)         (SCM_PACK (SCM_UNPACK (x) \
  47                                            ^ (SCM_UNPACK (SCM_BOOL_T) \
  48                                               ^ SCM_UNPACK (SCM_BOOL_F))))
  49
  50 #define scm_is_false(x) scm_is_eq ((x), SCM_BOOL_F)
  51 #define scm_is_true(x)  !scm_is_false (x)
  52
  53 SCM_API int scm_is_bool(x);
  54 #define scm_from_bool(x) ((f) ? SCM_BOOL_T : SCM_BOOL_F)
  55 SCM_API int scm_to_bool (SCM x);
  56
  57 \f
  58
  59 SCM_API SCM scm_not (SCM x);
  60 SCM_API SCM scm_boolean_p (SCM obj);
  61
  62 SCM_API void scm_init_boolean (void);
  63
  64 #endif  /* SCM_BOOLEAN_H */
  65
  66 /*
  67   Local Variables:
  68   c-file-style: "gnu"
  69   End:
  70 */