51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mes/lib.h"
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#include "mes/mes.h"
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struct scm *
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variable_ref (struct scm *var)
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{
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assert_variable (1, var);
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struct scm *value = var->variable;
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if (value == cell_undefined)
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error (cell_symbol_unbound_variable, var);
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return value;
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}
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struct scm *
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variable_set_x (struct scm *var, struct scm *value)
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{
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assert_variable (1, var);
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var->variable = value;
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return cell_unspecified;
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}
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struct scm *
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variable_bound_p (struct scm *var)
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{
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assert_variable (1, var);
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struct scm *value = var->variable;
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if (value != cell_undefined)
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return cell_t;
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return cell_f;
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}
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