libguile/boolean.h

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