1 /* Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
21 * The exception is that, if you link the GUILE library with other files
22 * to produce an executable, this does not by itself cause the
23 * resulting executable to be covered by the GNU General Public License.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
38 * If you write modifications of your own for GUILE, it is your choice
39 * whether to permit this exception to apply to your modifications.
40 * If you do not wish that, delete this exception notice. */
45 #include "libguile/_scm.h"
46 #include "libguile/eq.h"
47 #include "libguile/ports.h"
48 #include "libguile/root.h"
49 #include "libguile/smob.h"
50 #include "libguile/deprecation.h"
52 #include "libguile/validate.h"
53 #include "libguile/variable.h"
57 scm_i_variable_print (SCM exp
, SCM port
, scm_print_state
*pstate
)
59 scm_puts ("#<variable ", port
);
60 scm_intprint (SCM_UNPACK (exp
), 16, port
);
61 scm_puts (" value: ", port
);
62 scm_iprin1 (SCM_VARIABLE_REF (exp
), port
, pstate
);
69 make_variable (SCM init
)
71 return scm_cell (scm_tc7_variable
, SCM_UNPACK (init
));
74 SCM_DEFINE (scm_make_variable
, "make-variable", 1, 0, 0,
76 "Return a variable initialized to value @var{init}.")
77 #define FUNC_NAME s_scm_make_variable
79 return make_variable (init
);
84 SCM_DEFINE (scm_make_undefined_variable
, "make-undefined-variable", 0, 0, 0,
86 "Return a variable that is initially unbound.")
87 #define FUNC_NAME s_scm_make_undefined_variable
89 return make_variable (SCM_UNDEFINED
);
94 SCM_DEFINE (scm_variable_p
, "variable?", 1, 0, 0,
96 "Return @code{#t} iff @var{obj} is a variable object, else\n"
98 #define FUNC_NAME s_scm_variable_p
100 return SCM_BOOL (SCM_VARIABLEP (obj
));
105 SCM_DEFINE (scm_variable_ref
, "variable-ref", 1, 0, 0,
107 "Dereference @var{var} and return its value.\n"
108 "@var{var} must be a variable object; see @code{make-variable}\n"
109 "and @code{make-undefined-variable}.")
110 #define FUNC_NAME s_scm_variable_ref
113 SCM_VALIDATE_VARIABLE (1, var
);
114 val
= SCM_VARIABLE_REF (var
);
115 if (val
== SCM_UNDEFINED
)
116 SCM_MISC_ERROR ("variable is unbound: ~S", scm_list_1 (var
));
121 SCM_DEFINE (scm_variable_set_x
, "variable-set!", 2, 0, 0,
123 "Set the value of the variable @var{var} to @var{val}.\n"
124 "@var{var} must be a variable object, @var{val} can be any\n"
125 "value. Return an unspecified value.")
126 #define FUNC_NAME s_scm_variable_set_x
128 SCM_VALIDATE_VARIABLE (1, var
);
129 SCM_VARIABLE_SET (var
, val
);
130 return SCM_UNSPECIFIED
;
134 SCM_DEFINE (scm_variable_bound_p
, "variable-bound?", 1, 0, 0,
136 "Return @code{#t} iff @var{var} is bound to a value.\n"
137 "Throws an error if @var{var} is not a variable object.")
138 #define FUNC_NAME s_scm_variable_bound_p
140 SCM_VALIDATE_VARIABLE (1, var
);
141 return SCM_BOOL (SCM_VARIABLE_REF (var
) != SCM_UNDEFINED
);
149 #include "libguile/variable.x"