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<title>Non-instantiable non-classed fundamental types: GObject Reference Manual</title>
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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="gtype-non-instantiable"></a>Non-instantiable non-classed fundamental types</h2></div></div></div>

 A lot of types are not instantiable by the type system and do not have
 a class. Most of these types are fundamental trivial types such as gchar, 
 and are already registered by GLib.
 

 In the rare case of needing to register such a type in the type
 system, fill a
 <a class="link" href="gobject-Type-Information.html#GTypeInfo" title="struct GTypeInfo">GTypeInfo</a> structure with zeros since these types are also most of the time
 fundamental:
 
<div class="informalexample">
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 <td class="listing_code"><pre class="programlisting">GTypeInfo info = {
 0, /* class_size */
 NULL, /* base_init */
 NULL, /* base_destroy */
 NULL, /* class_init */
 NULL, /* class_destroy */
 NULL, /* class_data */
 0, /* instance_size */
 0, /* n_preallocs */
 NULL, /* instance_init */
 NULL, /* value_table */
};
static const GTypeValueTable value_table = {
 value_init_long0, /* value_init */
 NULL, /* value_free */
 value_copy_long0, /* value_copy */
 NULL, /* value_peek_pointer */
 "i", /* collect_format */
 value_collect_int, /* collect_value */
 "p", /* lcopy_format */
 value_lcopy_char, /* lcopy_value */
};
info.value_table = &value_table;
type = g_type_register_fundamental (G_TYPE_CHAR, "gchar", &info, &finfo, 0);</pre></td>
 </tr>
 </tbody>
 </table>
</div>

Having non-instantiable types might seem a bit useless: what good is a type
 if you cannot instantiate an instance of that type ? Most of these types
 are used in conjunction with <a class="link" href="gobject-Generic-values.html#GValue">GValue</a>s: a GValue is initialized
 with an integer or a string and it is passed around by using the registered 
 type's value_table. <a class="link" href="gobject-Generic-values.html#GValue">GValue</a>s (and by extension these trivial fundamental
 types) are most useful when used in conjunction with object properties and signals.
 
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