author | hgs |
Wed, 13 Oct 2010 19:39:18 +0530 | |
changeset 71 | 28ccaba883f4 |
parent 18 | 47c74d1534e1 |
permissions | -rw-r--r-- |
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/* GObject - GLib Type, Object, Parameter and Signal Library |
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* Copyright (C) 2000 Red Hat, Inc. |
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* Portions copyright (c) 2006-2009 Nokia Corporation. All rights reserved. |
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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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|
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#include "config.h" |
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|
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#include "gtypeplugin.h" |
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#include "gobjectalias.h" |
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|
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#ifdef __SYMBIAN32__ |
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#include "gobject_wsd.h" |
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#endif /* __SYMBIAN32__ */ |
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/** |
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* SECTION:gtypeplugin |
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* @short_description: An interface for dynamically loadable types |
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* @see_also: #GTypeModule and g_type_register_dynamic(). |
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* @title: GTypePlugin |
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* |
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* The GObject type system supports dynamic loading of types. The |
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* #GTypePlugin interface is used to handle the lifecycle of |
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* dynamically loaded types. It goes as follows: |
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* |
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* <orderedlist> |
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* <listitem><para> |
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* The type is initially introduced (usually upon loading the module |
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* the first time, or by your main application that knows what modules |
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* introduces what types), like this: |
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* |[ |
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* new_type_id = g_type_register_dynamic (parent_type_id, |
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* "TypeName", |
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* new_type_plugin, |
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* type_flags); |
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* ]| |
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* where <literal>new_type_plugin</literal> is an implementation of the |
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* #GTypePlugin interface. |
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* </para></listitem> |
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* <listitem><para> |
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* The type's implementation is referenced, e.g. through |
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* g_type_class_ref() or through g_type_create_instance() (this is |
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* being called by g_object_new()) or through one of the above done on |
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* a type derived from <literal>new_type_id</literal>. |
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* </para></listitem> |
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* <listitem><para> |
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* This causes the type system to load the type's implementation by calling |
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* g_type_plugin_use() and g_type_plugin_complete_type_info() on |
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* <literal>new_type_plugin</literal>. |
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* </para></listitem> |
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* <listitem><para> |
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* At some point the type's implementation isn't required anymore, e.g. after |
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* g_type_class_unref() or g_type_free_instance() (called when the reference |
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* count of an instance drops to zero). |
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* </para></listitem> |
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* <listitem><para> |
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* This causes the type system to throw away the information retrieved from |
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* g_type_plugin_complete_type_info() and then it calls |
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* g_type_plugin_unuse() on <literal>new_type_plugin</literal>. |
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* </para></listitem> |
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* <listitem><para> |
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* Things may repeat from the second step. |
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* </para></listitem> |
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* </orderedlist> |
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* |
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* So basically, you need to implement a #GTypePlugin type that |
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* carries a use_count, once use_count goes from zero to one, you need |
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* to load the implementation to successfully handle the upcoming |
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* g_type_plugin_complete_type_info() call. Later, maybe after |
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* succeeding use/unuse calls, once use_count drops to zero, you can |
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* unload the implementation again. The type system makes sure to call |
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* g_type_plugin_use() and g_type_plugin_complete_type_info() again |
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* when the type is needed again. |
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* |
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* #GTypeModule is an implementation of #GTypePlugin that already |
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* implements most of this except for the actual module loading and |
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* unloading. It even handles multiple registered types per module. |
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*/ |
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#if EMULATOR |
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PLS(type_plugin_type ,g_type_plugin_get_type,GType) |
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#define type_plugin_type (*FUNCTION_NAME(type_plugin_type ,g_type_plugin_get_type)()) |
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#endif /* EMULATOR */ |
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|
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/* --- functions --- */ |
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EXPORT_C GType |
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g_type_plugin_get_type (void) |
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{ |
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#if !(EMULATOR) |
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static GType type_plugin_type = 0; |
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#endif /* EMULATOR*/ |
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104 |
|
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if (!type_plugin_type) |
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106 |
{ |
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static const GTypeInfo type_plugin_info = { |
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sizeof (GTypePluginClass), |
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NULL, /* base_init */ |
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NULL, /* base_finalize */ |
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111 |
}; |
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112 |
|
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type_plugin_type = g_type_register_static (G_TYPE_INTERFACE, g_intern_static_string ("GTypePlugin"), &type_plugin_info, 0); |
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} |
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115 |
|
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return type_plugin_type; |
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} |
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118 |
|
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119 |
#if EMULATOR |
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#undef type_plugin_type |
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#endif /* EMULATOR */ |
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122 |
|
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123 |
/** |
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* g_type_plugin_use: |
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* @plugin: a #GTypePlugin |
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126 |
* |
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* Calls the @use_plugin function from the #GTypePluginClass of |
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* @plugin. There should be no need to use this function outside of |
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* the GObject type system itself. |
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*/ |
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131 |
EXPORT_C void |
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g_type_plugin_use (GTypePlugin *plugin) |
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133 |
{ |
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GTypePluginClass *iface; |
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135 |
|
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g_return_if_fail (G_IS_TYPE_PLUGIN (plugin)); |
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137 |
|
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iface = G_TYPE_PLUGIN_GET_CLASS (plugin); |
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iface->use_plugin (plugin); |
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140 |
} |
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141 |
|
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142 |
/** |
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143 |
* g_type_plugin_unuse: |
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* @plugin: a #GTypePlugin |
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145 |
* |
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* Calls the @unuse_plugin function from the #GTypePluginClass of |
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* @plugin. There should be no need to use this function outside of |
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* the GObject type system itself. |
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149 |
*/ |
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150 |
EXPORT_C void |
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g_type_plugin_unuse (GTypePlugin *plugin) |
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152 |
{ |
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GTypePluginClass *iface; |
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154 |
|
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g_return_if_fail (G_IS_TYPE_PLUGIN (plugin)); |
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156 |
|
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iface = G_TYPE_PLUGIN_GET_CLASS (plugin); |
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iface->unuse_plugin (plugin); |
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159 |
} |
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160 |
|
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161 |
/** |
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* g_type_plugin_complete_type_info: |
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* @plugin: a #GTypePlugin |
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* @g_type: the #GType whose info is completed |
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* @info: the #GTypeInfo struct to fill in |
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* @value_table: the #GTypeValueTable to fill in |
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* |
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* Calls the @complete_type_info function from the #GTypePluginClass of @plugin. |
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* There should be no need to use this function outside of the GObject |
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* type system itself. |
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*/ |
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172 |
EXPORT_C void |
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g_type_plugin_complete_type_info (GTypePlugin *plugin, |
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GType g_type, |
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GTypeInfo *info, |
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GTypeValueTable *value_table) |
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177 |
{ |
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GTypePluginClass *iface; |
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179 |
|
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g_return_if_fail (G_IS_TYPE_PLUGIN (plugin)); |
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g_return_if_fail (info != NULL); |
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g_return_if_fail (value_table != NULL); |
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183 |
|
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iface = G_TYPE_PLUGIN_GET_CLASS (plugin); |
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iface->complete_type_info (plugin, |
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g_type, |
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info, |
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188 |
value_table); |
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} |
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190 |
|
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191 |
/** |
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* g_type_plugin_complete_interface_info: |
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* @plugin: the #GTypePlugin |
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* @instance_type: the #GType of an instantiable type to which the interface |
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* is added |
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* @interface_type: the #GType of the interface whose info is completed |
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* @info: the #GInterfaceInfo to fill in |
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* |
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* Calls the @complete_interface_info function from the |
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* #GTypePluginClass of @plugin. There should be no need to use this |
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* function outside of the GObject type system itself. |
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*/ |
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EXPORT_C void |
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g_type_plugin_complete_interface_info (GTypePlugin *plugin, |
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GType instance_type, |
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GType interface_type, |
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GInterfaceInfo *info) |
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{ |
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GTypePluginClass *iface; |
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|
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g_return_if_fail (G_IS_TYPE_PLUGIN (plugin)); |
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g_return_if_fail (info != NULL); |
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|
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iface = G_TYPE_PLUGIN_GET_CLASS (plugin); |
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iface->complete_interface_info (plugin, |
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instance_type, |
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interface_type, |
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info); |
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} |
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|
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#define __G_TYPE_PLUGIN_C__ |
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#include "gobjectaliasdef.c" |