mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-12-26 23:46:15 +01:00
4441595378
These did show up in the html. Since symbol names are checked for a trailing plural s when generating the docs, the links stay functional after removing these comments. https://bugzilla.gnome.org/show_bug.cgi?id=728380
255 lines
9.1 KiB
C
255 lines
9.1 KiB
C
/* 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, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* gvaluecollector.h: GValue varargs stubs
|
|
*/
|
|
/**
|
|
* SECTION:value_collection
|
|
* @Short_description: Converting varargs to generic values
|
|
* @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 actual values collected
|
|
*/
|
|
/**
|
|
* GTypeCValue:
|
|
* @v_int: the field for holding integer values
|
|
* @v_long: the field for holding long integer values
|
|
* @v_int64: the field for holding 64 bit integer values
|
|
* @v_double: the field for holding floating point values
|
|
* @v_pointer: the field for holding pointers
|
|
*
|
|
* 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_INIT:
|
|
* @value: a #GValue return location. @value must contain only 0 bytes.
|
|
* @_value_type: the #GType to use for @value.
|
|
* @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.
|
|
*
|
|
* Since: 2.24
|
|
*/
|
|
#define G_VALUE_COLLECT_INIT(value, _value_type, var_args, flags, __error) \
|
|
G_STMT_START { \
|
|
GValue *_val = (value); \
|
|
guint _flags = (flags); \
|
|
GTypeValueTable *_vtab = g_type_value_table_peek (_value_type); \
|
|
const gchar *_collect_format = _vtab->collect_format; \
|
|
GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \
|
|
guint _n_values = 0; \
|
|
\
|
|
_val->g_type = _value_type; /* value_meminit() from gvalue.c */ \
|
|
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) = _vtab->collect_value (_val, \
|
|
_n_values, \
|
|
_cvalues, \
|
|
_flags); \
|
|
} G_STMT_END
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Note: If you are creating the @value argument just before calling this macro,
|
|
* you should use the #G_VALUE_COLLECT_INIT variant and pass the unitialized
|
|
* #GValue. That variant is faster than #G_VALUE_COLLECT.
|
|
*/
|
|
#define G_VALUE_COLLECT(value, var_args, flags, __error) G_STMT_START { \
|
|
GValue *_value = (value); \
|
|
GType _value_type = G_VALUE_TYPE (_value); \
|
|
GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
|
|
\
|
|
if (_vtable->value_free) \
|
|
_vtable->value_free (_value); \
|
|
memset (_value->data, 0, sizeof (_value->data)); \
|
|
\
|
|
G_VALUE_COLLECT_INIT(value, _value_type, var_args, flags, __error); \
|
|
} G_STMT_END
|
|
|
|
#define G_VALUE_COLLECT_SKIP(_value_type, var_args) \
|
|
G_STMT_START { \
|
|
GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
|
|
const gchar *_collect_format = _vtable->collect_format; \
|
|
\
|
|
while (*_collect_format) \
|
|
{ \
|
|
switch (*_collect_format++) \
|
|
{ \
|
|
case G_VALUE_COLLECT_INT: \
|
|
va_arg ((var_args), gint); \
|
|
break; \
|
|
case G_VALUE_COLLECT_LONG: \
|
|
va_arg ((var_args), glong); \
|
|
break; \
|
|
case G_VALUE_COLLECT_INT64: \
|
|
va_arg ((var_args), gint64); \
|
|
break; \
|
|
case G_VALUE_COLLECT_DOUBLE: \
|
|
va_arg ((var_args), gdouble); \
|
|
break; \
|
|
case G_VALUE_COLLECT_POINTER: \
|
|
va_arg ((var_args), gpointer); \
|
|
break; \
|
|
default: \
|
|
g_assert_not_reached (); \
|
|
} \
|
|
} \
|
|
} 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); \
|
|
const 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 #GTypeCValues which can be collected for a
|
|
* single #GValue.
|
|
*/
|
|
#define G_VALUE_COLLECT_FORMAT_MAX_LENGTH (8)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __G_VALUE_COLLECTOR_H__ */
|