1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1998, 1999, 2000 Tim Janik and Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
17 * Boston, MA 02111-1307, USA.
19 * gvaluecollector.h: GValue varargs stubs
21 #ifndef __G_VALUE_COLLECTOR_H__
22 #define __G_VALUE_COLLECTOR_H__
27 #endif /* __cplusplus */
30 /* we may want to add aggregate types here some day, if requested
31 * by users. the basic C types are covered already, everything
32 * smaller than an int is promoted to an integer and floats are
33 * always promoted to doubles for varargs call constructions.
40 G_VALUE_COLLECT_DOUBLE,
41 G_VALUE_COLLECT_POINTER
53 /* G_VALUE_COLLECT() collects a variable argument value
54 * from a va_list. we have to implement the varargs collection as a
55 * macro, because on some systems va_list variables cannot be passed
57 * value is supposed to be initialized according to the value
58 * type to be collected.
59 * var_args is the va_list variable and may be evaluated multiple times.
60 * __error is a gchar** variable that will be modified to hold a g_new()
61 * allocated error messages if something fails.
63 #define G_VALUE_COLLECT(value, var_args, __error) \
65 GValue *_value = (value); \
66 GTypeValueTable *_vtable = g_type_value_table_peek (G_VALUE_TYPE (_value)); \
67 gchar *_error_msg = NULL; \
68 guint _collect_type = _vtable->collect_type; \
69 guint _nth_value = 0; \
71 g_value_reset (_value); \
72 while (_collect_type && !_error_msg) \
74 GTypeCValue _cvalue = { 0, }; \
76 switch (_collect_type) \
78 case G_VALUE_COLLECT_INT: \
79 _cvalue.v_int = va_arg ((var_args), gint); \
81 case G_VALUE_COLLECT_LONG: \
82 _cvalue.v_long = va_arg ((var_args), glong); \
84 case G_VALUE_COLLECT_DOUBLE: \
85 _cvalue.v_double = va_arg ((var_args), gdouble); \
87 case G_VALUE_COLLECT_POINTER: \
88 _cvalue.v_pointer = va_arg ((var_args), gpointer); \
91 _error_msg = g_strdup_printf ("%s: invalid collect type (%d) used for %s", \
94 "G_VALUE_COLLECT()"); \
97 _error_msg = _vtable->collect_value (_value, \
102 *(__error) = _error_msg; \
106 /* G_VALUE_LCOPY() collects a value's variable argument
107 * locations from a va_list. usage is analogous to G_VALUE_COLLECT().
109 #define G_VALUE_LCOPY(value, var_args, __error) \
111 GValue *_value = (value); \
112 GTypeValueTable *_vtable = g_type_value_table_peek (G_VALUE_TYPE (_value)); \
113 gchar *_error_msg = NULL; \
114 guint _lcopy_type = _vtable->lcopy_type; \
115 guint _nth_value = 0; \
117 while (_lcopy_type && !_error_msg) \
119 GTypeCValue _cvalue = { 0, }; \
121 switch (_lcopy_type) \
123 case G_VALUE_COLLECT_INT: \
124 _cvalue.v_int = va_arg ((var_args), gint); \
126 case G_VALUE_COLLECT_LONG: \
127 _cvalue.v_long = va_arg ((var_args), glong); \
129 case G_VALUE_COLLECT_DOUBLE: \
130 _cvalue.v_double = va_arg ((var_args), gdouble); \
132 case G_VALUE_COLLECT_POINTER: \
133 _cvalue.v_pointer = va_arg ((var_args), gpointer); \
136 _error_msg = g_strdup_printf ("%s: invalid collect type (%d) used for %s", \
139 "G_VALUE_LCOPY()"); \
142 _error_msg = _vtable->lcopy_value (_value, \
147 *(__error) = _error_msg; \
154 #endif /* __cplusplus */
156 #endif /* __G_VALUE_COLLECTOR_H__ */