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76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/* Copyright (C) 1995, 1996, 2000, 2001 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "libguile/_scm.h"
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#include "libguile/validate.h"
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#include "libguile/boolean.h"
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#include "libguile/lang.h"
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SCM_DEFINE (scm_not, "not", 1, 0, 0,
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(SCM x),
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"Return @code{#t} iff @var{x} is @code{#f}, else return @code{#f}.")
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#define FUNC_NAME s_scm_not
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{
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return SCM_BOOL(SCM_FALSEP (x) || SCM_NILP (x));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_boolean_p, "boolean?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} iff @var{obj} is either @code{#t} or @code{#f}.")
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#define FUNC_NAME s_scm_boolean_p
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{
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return SCM_BOOL (SCM_BOOLP (obj) || SCM_NILP (obj));
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}
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#undef FUNC_NAME
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int
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scm_is_bool (SCM x)
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{
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return scm_is_eq (x, SCM_BOOL_F) || scm_is_eq (SCM_BOOL_T);
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}
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int
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scm_to_bool (SCM x)
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{
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if (scm_is_eq (x, SCM_BOOL_F))
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return 0;
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else if (scm_is_eq (x, SCM_BOOL_T))
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return 1;
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else
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scm_wrong_type_arg (NULL, 0, x);
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}
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void
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scm_init_boolean ()
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{
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#include "libguile/boolean.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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