--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/glib/gobject/gvaluecollector.h Fri Apr 16 16:46:38 2010 +0300
@@ -0,0 +1,195 @@
+/* GObject - GLib Type, Object, Parameter and Signal Library
+ * Copyright (C) 1998-1999, 2000-2001 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
+ */
+/**
+ * SECTION:value_collection
+ * @Short_description: Converting varargs to generic values
+ * @See_also:#GValueTable
+ * @Title: Varargs Value Collection
+ *
+ * The macros in this section provide the varargs parsing support needed
+ * in variadic GObject functions such as g_object_new() or g_object_set().
+ * They currently support the collection of integral types, floating point
+ * types and pointers.
+ */
+#ifndef __G_VALUE_COLLECTOR_H__
+#define __G_VALUE_COLLECTOR_H__
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+/* 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_INT = 'i',
+ G_VALUE_COLLECT_LONG = 'l',
+ G_VALUE_COLLECT_INT64 = 'q',
+ G_VALUE_COLLECT_DOUBLE = 'd',
+ G_VALUE_COLLECT_POINTER = 'p'
+};
+
+
+/* vararg union holding actuall values collected
+ */
+/**
+ * GTypeCValue:
+ *
+ * A union holding one collected value.
+ */
+union _GTypeCValue
+{
+ gint v_int;
+ glong v_long;
+ gint64 v_int64;
+ gdouble v_double;
+ gpointer v_pointer;
+};
+
+/**
+ * G_VALUE_COLLECT:
+ * @value: a #GValue return location. @value is supposed to be initialized
+ * according to the value type to be collected
+ * @var_args: the va_list variable; it may be evaluated multiple times
+ * @flags: flags which are passed on to the collect_value() function of
+ * the #GTypeValueTable of @value.
+ * @__error: a #gchar** variable that will be modified to hold a g_new()
+ * allocated error messages if something fails
+ *
+ * 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.
+ */
+#define G_VALUE_COLLECT(value, var_args, flags, __error) \
+G_STMT_START { \
+ GValue *_value = (value); \
+ guint _flags = (flags); \
+ GType _value_type = G_VALUE_TYPE (_value); \
+ GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
+ gchar *_collect_format = _vtable->collect_format; \
+ GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \
+ guint _n_values = 0; \
+ \
+ if (_vtable->value_free) \
+ _vtable->value_free (_value); \
+ _value->g_type = _value_type; /* value_meminit() from gvalue.c */ \
+ memset (_value->data, 0, sizeof (_value->data)); \
+ while (*_collect_format) \
+ { \
+ GTypeCValue *_cvalue = _cvalues + _n_values++; \
+ \
+ switch (*_collect_format++) \
+ { \
+ 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_INT64: \
+ _cvalue->v_int64 = va_arg ((var_args), gint64); \
+ 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: \
+ g_assert_not_reached (); \
+ } \
+ } \
+ *(__error) = _vtable->collect_value (_value, \
+ _n_values, \
+ _cvalues, \
+ _flags); \
+} G_STMT_END
+
+
+/**
+ * G_VALUE_LCOPY:
+ * @value: a #GValue return location. @value is supposed to be initialized
+ * according to the value type to be collected
+ * @var_args: the va_list variable; it may be evaluated multiple times
+ * @flags: flags which are passed on to the lcopy_value() function of
+ * the #GTypeValueTable of @value.
+ * @__error: a #gchar** variable that will be modified to hold a g_new()
+ * allocated error messages if something fails
+ *
+ * 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, flags, __error) \
+G_STMT_START { \
+ const GValue *_value = (value); \
+ guint _flags = (flags); \
+ GType _value_type = G_VALUE_TYPE (_value); \
+ GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
+ gchar *_lcopy_format = _vtable->lcopy_format; \
+ GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \
+ guint _n_values = 0; \
+ \
+ while (*_lcopy_format) \
+ { \
+ GTypeCValue *_cvalue = _cvalues + _n_values++; \
+ \
+ switch (*_lcopy_format++) \
+ { \
+ 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_INT64: \
+ _cvalue->v_int64 = va_arg ((var_args), gint64); \
+ 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: \
+ g_assert_not_reached (); \
+ } \
+ } \
+ *(__error) = _vtable->lcopy_value (_value, \
+ _n_values, \
+ _cvalues, \
+ _flags); \
+} G_STMT_END
+
+
+/**
+ * G_VALUE_COLLECT_FORMAT_MAX_LENGTH:
+ *
+ * The maximal number of #GTypeCValue<!-- -->s which can be collected for a
+ * single #GValue.
+ */
+#define G_VALUE_COLLECT_FORMAT_MAX_LENGTH (8)
+
+G_END_DECLS
+
+#endif /* __G_VALUE_COLLECTOR_H__ */