-/* Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2006, 2008, 2011 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 3 of
+ * the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
*/
\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
#include "libguile/_scm.h"
#include "libguile/eq.h"
void
scm_i_variable_print (SCM exp, SCM port, scm_print_state *pstate)
{
- scm_puts ("#<variable ", port);
+ scm_puts_unlocked ("#<variable ", port);
scm_uintprint (SCM_UNPACK (exp), 16, port);
- scm_puts (" value: ", port);
+ scm_puts_unlocked (" value: ", port);
scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate);
- scm_putc('>', port);
+ scm_putc_unlocked('>', port);
}
\f
SCM val;
SCM_VALIDATE_VARIABLE (1, var);
val = SCM_VARIABLE_REF (var);
- if (val == SCM_UNDEFINED)
+ if (scm_is_eq (val, SCM_UNDEFINED))
SCM_MISC_ERROR ("variable is unbound: ~S", scm_list_1 (var));
return val;
}
}
#undef FUNC_NAME
+SCM_DEFINE (scm_variable_unset_x, "variable-unset!", 1, 0, 0,
+ (SCM var),
+ "Ensure that @var{var} is not bound to a value.\n"
+ "@var{var} must be a variable object.")
+#define FUNC_NAME s_scm_variable_unset_x
+{
+ SCM_VALIDATE_VARIABLE (1, var);
+ SCM_VARIABLE_SET (var, SCM_UNDEFINED);
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0,
(SCM var),
"Return @code{#t} iff @var{var} is bound to a value.\n"
#define FUNC_NAME s_scm_variable_bound_p
{
SCM_VALIDATE_VARIABLE (1, var);
- return scm_from_bool (SCM_VARIABLE_REF (var) != SCM_UNDEFINED);
+ return scm_from_bool (!scm_is_eq (SCM_VARIABLE_REF (var), SCM_UNDEFINED));
}
#undef FUNC_NAME