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132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/* Copyright (C) 1995,1996,1997,1998,2000,2001 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/eq.h"
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#include "libguile/ports.h"
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#include "libguile/root.h"
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#include "libguile/smob.h"
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#include "libguile/deprecation.h"
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#include "libguile/validate.h"
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#include "libguile/variable.h"
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void
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scm_i_variable_print (SCM exp, SCM port, scm_print_state *pstate)
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{
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scm_puts ("#<variable ", port);
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scm_intprint (SCM_UNPACK (exp), 16, port);
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scm_puts (" value: ", port);
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scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate);
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scm_putc('>', port);
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}
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static SCM
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make_variable (SCM init)
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{
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return scm_cell (scm_tc7_variable, SCM_UNPACK (init));
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}
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SCM_DEFINE (scm_make_variable, "make-variable", 1, 0, 0,
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(SCM init),
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"Return a variable initialized to value @var{init}.")
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#define FUNC_NAME s_scm_make_variable
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{
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return make_variable (init);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 0, 0,
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(),
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"Return a variable that is initially unbound.")
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#define FUNC_NAME s_scm_make_undefined_variable
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{
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return make_variable (SCM_UNDEFINED);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} iff @var{obj} is a variable object, else\n"
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"return @code{#f}.")
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#define FUNC_NAME s_scm_variable_p
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{
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return SCM_BOOL (SCM_VARIABLEP (obj));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0,
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(SCM var),
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"Dereference @var{var} and return its value.\n"
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"@var{var} must be a variable object; see @code{make-variable}\n"
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"and @code{make-undefined-variable}.")
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#define FUNC_NAME s_scm_variable_ref
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{
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SCM val;
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SCM_VALIDATE_VARIABLE (1, var);
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val = SCM_VARIABLE_REF (var);
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if (val == SCM_UNDEFINED)
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SCM_MISC_ERROR ("variable is unbound: ~S", scm_list_1 (var));
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return val;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0,
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(SCM var, SCM val),
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"Set the value of the variable @var{var} to @var{val}.\n"
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"@var{var} must be a variable object, @var{val} can be any\n"
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"value. Return an unspecified value.")
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#define FUNC_NAME s_scm_variable_set_x
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{
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SCM_VALIDATE_VARIABLE (1, var);
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SCM_VARIABLE_SET (var, val);
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0,
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(SCM var),
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"Return @code{#t} iff @var{var} is bound to a value.\n"
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"Throws an error if @var{var} is not a variable object.")
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#define FUNC_NAME s_scm_variable_bound_p
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{
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SCM_VALIDATE_VARIABLE (1, var);
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return SCM_BOOL (SCM_VARIABLE_REF (var) != SCM_UNDEFINED);
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}
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#undef FUNC_NAME
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void
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scm_init_variable ()
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{
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#include "libguile/variable.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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