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Some links were broken due to typos, because functionality was removed in GLib 2.0 or for various other reasons. Fix up as many of them as is reasonable.
227 lines
8.2 KiB
C
227 lines
8.2 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* gvaluecollector.h: GValue varargs stubs
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*/
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/**
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* SECTION:value_collection
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* @Short_description: Converting varargs to generic values
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* @Title: Varargs Value Collection
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*
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* The macros in this section provide the varargs parsing support needed
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* in variadic GObject functions such as g_object_new() or g_object_set().
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* They currently support the collection of integral types, floating point
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* types and pointers.
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*/
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#ifndef __G_VALUE_COLLECTOR_H__
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#define __G_VALUE_COLLECTOR_H__
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#include <glib-object.h>
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G_BEGIN_DECLS
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/* we may want to add aggregate types here some day, if requested
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* by users. the basic C types are covered already, everything
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* smaller than an int is promoted to an integer and floats are
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* always promoted to doubles for varargs call constructions.
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*/
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enum /*< skip >*/
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{
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G_VALUE_COLLECT_INT = 'i',
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G_VALUE_COLLECT_LONG = 'l',
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G_VALUE_COLLECT_INT64 = 'q',
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G_VALUE_COLLECT_DOUBLE = 'd',
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G_VALUE_COLLECT_POINTER = 'p'
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};
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/* vararg union holding actual values collected
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*/
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/**
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* GTypeCValue:
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* @v_int: the field for holding integer values
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* @v_long: the field for holding long integer values
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* @v_int64: the field for holding 64 bit integer values
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* @v_double: the field for holding floating point values
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* @v_pointer: the field for holding pointers
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*
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* A union holding one collected value.
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*/
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union _GTypeCValue
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{
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gint v_int;
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glong v_long;
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gint64 v_int64;
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gdouble v_double;
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gpointer v_pointer;
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};
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/**
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* G_VALUE_COLLECT_INIT:
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* @value: a #GValue return location. @value must contain only 0 bytes.
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* @_value_type: the #GType to use for @value.
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* @var_args: the va_list variable; it may be evaluated multiple times
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* @flags: flags which are passed on to the collect_value() function of
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* the #GTypeValueTable of @value.
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* @__error: a #gchar** variable that will be modified to hold a g_new()
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* allocated error messages if something fails
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*
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* Collects a variable argument value from a va_list. We have to
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* implement the varargs collection as a macro, because on some systems
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* va_list variables cannot be passed by reference.
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*
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* Since: 2.24
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*/
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#define G_VALUE_COLLECT_INIT(value, _value_type, var_args, flags, __error) \
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G_STMT_START { \
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GValue *_val = (value); \
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guint _flags = (flags); \
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GTypeValueTable *_vtab = g_type_value_table_peek (_value_type); \
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gchar *_collect_format = _vtab->collect_format; \
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GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \
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guint _n_values = 0; \
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\
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_val->g_type = _value_type; /* value_meminit() from gvalue.c */ \
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while (*_collect_format) \
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{ \
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GTypeCValue *_cvalue = _cvalues + _n_values++; \
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\
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switch (*_collect_format++) \
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{ \
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case G_VALUE_COLLECT_INT: \
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_cvalue->v_int = va_arg ((var_args), gint); \
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break; \
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case G_VALUE_COLLECT_LONG: \
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_cvalue->v_long = va_arg ((var_args), glong); \
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break; \
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case G_VALUE_COLLECT_INT64: \
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_cvalue->v_int64 = va_arg ((var_args), gint64); \
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break; \
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case G_VALUE_COLLECT_DOUBLE: \
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_cvalue->v_double = va_arg ((var_args), gdouble); \
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break; \
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case G_VALUE_COLLECT_POINTER: \
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_cvalue->v_pointer = va_arg ((var_args), gpointer); \
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break; \
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default: \
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g_assert_not_reached (); \
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} \
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} \
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*(__error) = _vtab->collect_value (_val, \
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_n_values, \
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_cvalues, \
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_flags); \
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} G_STMT_END
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/**
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* G_VALUE_COLLECT:
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* @value: a #GValue return location. @value is supposed to be initialized
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* according to the value type to be collected
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* @var_args: the va_list variable; it may be evaluated multiple times
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* @flags: flags which are passed on to the collect_value() function of
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* the #GTypeValueTable of @value.
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* @__error: a #gchar** variable that will be modified to hold a g_new()
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* allocated error messages if something fails
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*
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* Collects a variable argument value from a va_list. We have to
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* implement the varargs collection as a macro, because on some systems
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* va_list variables cannot be passed by reference.
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*
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* Note: If you are creating the @value argument just before calling this macro,
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* you should use the #G_VALUE_COLLECT_INIT variant and pass the unitialized
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* #GValue. That variant is faster than #G_VALUE_COLLECT.
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*/
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#define G_VALUE_COLLECT(value, var_args, flags, __error) G_STMT_START { \
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GValue *_value = (value); \
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GType _value_type = G_VALUE_TYPE (_value); \
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GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
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\
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if (_vtable->value_free) \
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_vtable->value_free (_value); \
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memset (_value->data, 0, sizeof (_value->data)); \
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\
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G_VALUE_COLLECT_INIT(value, _value_type, var_args, flags, __error); \
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} G_STMT_END
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/**
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* G_VALUE_LCOPY:
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* @value: a #GValue return location. @value is supposed to be initialized
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* according to the value type to be collected
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* @var_args: the va_list variable; it may be evaluated multiple times
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* @flags: flags which are passed on to the lcopy_value() function of
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* the #GTypeValueTable of @value.
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* @__error: a #gchar** variable that will be modified to hold a g_new()
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* allocated error messages if something fails
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*
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* Collects a value's variable argument locations from a va_list. Usage is
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* analogous to G_VALUE_COLLECT().
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*/
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#define G_VALUE_LCOPY(value, var_args, flags, __error) \
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G_STMT_START { \
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const GValue *_value = (value); \
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guint _flags = (flags); \
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GType _value_type = G_VALUE_TYPE (_value); \
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GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
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gchar *_lcopy_format = _vtable->lcopy_format; \
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GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \
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guint _n_values = 0; \
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\
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while (*_lcopy_format) \
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{ \
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GTypeCValue *_cvalue = _cvalues + _n_values++; \
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\
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switch (*_lcopy_format++) \
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{ \
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case G_VALUE_COLLECT_INT: \
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_cvalue->v_int = va_arg ((var_args), gint); \
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break; \
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case G_VALUE_COLLECT_LONG: \
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_cvalue->v_long = va_arg ((var_args), glong); \
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break; \
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case G_VALUE_COLLECT_INT64: \
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_cvalue->v_int64 = va_arg ((var_args), gint64); \
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break; \
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case G_VALUE_COLLECT_DOUBLE: \
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_cvalue->v_double = va_arg ((var_args), gdouble); \
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break; \
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case G_VALUE_COLLECT_POINTER: \
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_cvalue->v_pointer = va_arg ((var_args), gpointer); \
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break; \
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default: \
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g_assert_not_reached (); \
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} \
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} \
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*(__error) = _vtable->lcopy_value (_value, \
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_n_values, \
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_cvalues, \
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_flags); \
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} G_STMT_END
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/**
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* G_VALUE_COLLECT_FORMAT_MAX_LENGTH:
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*
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* The maximal number of #GTypeCValue<!-- -->s which can be collected for a
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* single #GValue.
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*/
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#define G_VALUE_COLLECT_FORMAT_MAX_LENGTH (8)
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G_END_DECLS
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#endif /* __G_VALUE_COLLECTOR_H__ */
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