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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 1998, 1999, 2000 Tim Janik and Red Hat, 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 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
* 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.
*
* gvaluecollector.h: GValue varargs stubs
*/
#ifndef __G_VALUE_COLLECTOR_H__
#define __G_VALUE_COLLECTOR_H__
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* we may want to add aggregate types here some day, if requested
* by users. the basic C types are covered already, everything
* smaller than an int is promoted to an integer and floats are
* always promoted to doubles for varargs call constructions.
*/
enum /*< skip >*/
{
G_VALUE_COLLECT_NONE,
G_VALUE_COLLECT_INT,
G_VALUE_COLLECT_LONG,
G_VALUE_COLLECT_DOUBLE,
G_VALUE_COLLECT_POINTER
};
union _GTypeCValue
{
gint v_int;
glong v_long;
gdouble v_double;
gpointer v_pointer;
};
/* G_VALUE_COLLECT() collects a variable argument value
* from a va_list. we have to implement the varargs collection as a
* macro, because on some systems va_list variables cannot be passed
* by reference.
* value is supposed to be initialized according to the value
* type to be collected.
* var_args is the va_list variable and may be evaluated multiple times.
* __error is a gchar** variable that will be modified to hold a g_new()
* allocated error messages if something fails.
*/
#define G_VALUE_COLLECT(value, var_args, __error) \
G_STMT_START { \
GValue *_value = (value); \
GTypeValueTable *_vtable = g_type_value_table_peek (G_VALUE_TYPE (_value)); \
gchar *_error_msg = NULL; \
guint _collect_type = _vtable->collect_type; \
guint _nth_value = 0; \
\
g_value_reset (_value); \
while (_collect_type && !_error_msg) \
{ \
GTypeCValue _cvalue; \
\
memset (&_cvalue, 0, sizeof (_cvalue)); \
switch (_collect_type) \
{ \
case G_VALUE_COLLECT_INT: \
_cvalue.v_int = va_arg ((var_args), gint); \
break; \
case G_VALUE_COLLECT_LONG: \
_cvalue.v_long = va_arg ((var_args), glong); \
break; \
case G_VALUE_COLLECT_DOUBLE: \
_cvalue.v_double = va_arg ((var_args), gdouble); \
break; \
case G_VALUE_COLLECT_POINTER: \
_cvalue.v_pointer = va_arg ((var_args), gpointer); \
break; \
default: \
_error_msg = g_strdup_printf ("%s: invalid collect type (%d) used for %s", \
G_STRLOC, \
_collect_type, \
"G_VALUE_COLLECT()"); \
continue; \
} \
_error_msg = _vtable->collect_value (_value, \
_nth_value++, \
&_collect_type, \
&_cvalue); \
} \
*(__error) = _error_msg; \
} G_STMT_END
/* G_VALUE_LCOPY() collects a value's variable argument
* locations from a va_list. usage is analogous to G_VALUE_COLLECT().
*/
#define G_VALUE_LCOPY(value, var_args, __error) \
G_STMT_START { \
GValue *_value = (value); \
GTypeValueTable *_vtable = g_type_value_table_peek (G_VALUE_TYPE (_value)); \
gchar *_error_msg = NULL; \
guint _lcopy_type = _vtable->lcopy_type; \
guint _nth_value = 0; \
\
while (_lcopy_type && !_error_msg) \
{ \
GTypeCValue _cvalue; \
\
memset (&_cvalue, 0, sizeof (_cvalue)); \
switch (_lcopy_type) \
{ \
case G_VALUE_COLLECT_INT: \
_cvalue.v_int = va_arg ((var_args), gint); \
break; \
case G_VALUE_COLLECT_LONG: \
_cvalue.v_long = va_arg ((var_args), glong); \
break; \
case G_VALUE_COLLECT_DOUBLE: \
_cvalue.v_double = va_arg ((var_args), gdouble); \
break; \
case G_VALUE_COLLECT_POINTER: \
_cvalue.v_pointer = va_arg ((var_args), gpointer); \
break; \
default: \
_error_msg = g_strdup_printf ("%s: invalid collect type (%d) used for %s", \
G_STRLOC, \
_lcopy_type, \
"G_VALUE_LCOPY()"); \
continue; \
} \
_error_msg = _vtable->lcopy_value (_value, \
_nth_value++, \
&_lcopy_type, \
&_cvalue); \
} \
*(__error) = _error_msg; \
} G_STMT_END
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __G_VALUE_COLLECTOR_H__ */
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