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156 lines
3.9 KiB
Plaintext
156 lines
3.9 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GBoxed
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<!-- ##### SECTION Short_Description ##### -->
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A mechanism to wrap opaque C structures registered by the type system
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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GBoxed is a generic wrapper mechanism for arbitrary C structures. The only
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thing the type system needs to know about the structures is how to copy and
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free them, beyond that they are treated as opaque chunks of memory.
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</para>
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<para>
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Boxed types are useful for simple value-holder structures like rectangles or
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points. They can also be used for wrapping structures defined in non-GObject
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based libraries.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GParamSpecBoxed, g_param_spec_boxed()
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</para>
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<!-- ##### SECTION Stability_Level ##### -->
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<!-- ##### USER_FUNCTION GBoxedCopyFunc ##### -->
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<para>
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This function is provided by the user and should produce a copy of the passed
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in boxed structure.
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</para>
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@boxed: The boxed structure to be copied.
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@Returns: The newly created copy of the boxed structure.
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<!-- ##### USER_FUNCTION GBoxedFreeFunc ##### -->
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<para>
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This function is provided by the user and should free the boxed
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structure passed.
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</para>
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@boxed: The boxed structure to be freed.
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<!-- ##### FUNCTION g_boxed_copy ##### -->
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<para>
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Provide a copy of a boxed structure @src_boxed which is of type @boxed_type.
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</para>
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@boxed_type: The type of @src_boxed.
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@src_boxed: The boxed structure to be copied.
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@Returns: The newly created copy of the boxed structure.
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<!-- ##### FUNCTION g_boxed_free ##### -->
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<para>
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Free the boxed structure @boxed which is of type @boxed_type.
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</para>
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@boxed_type: The type of @boxed.
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@boxed: The boxed structure to be freed.
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<!-- ##### FUNCTION g_boxed_type_register_static ##### -->
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<para>
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This function creates a new %G_TYPE_BOXED derived type id for a new
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boxed type with name @name. Boxed type handling functions have to be
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provided to copy and free opaque boxed structures of this type.
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</para>
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@name: Name of the new boxed type.
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@boxed_copy: Boxed structure copy function.
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@boxed_free: Boxed structure free function.
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@Returns: New %G_TYPE_BOXED derived type id for @name.
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<!-- ##### FUNCTION g_pointer_type_register_static ##### -->
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<para>
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Creates a new %G_TYPE_POINTER derived type id for a new
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pointer type with name @name.
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</para>
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@name: the name of the new pointer type.
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@Returns: a new %G_TYPE_POINTER derived type id for @name.
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<!-- ##### MACRO G_TYPE_HASH_TABLE ##### -->
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<para>
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The #GType for a boxed type holding a #GHashTable reference.
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</para>
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@Since: 2.10
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<!-- ##### MACRO G_TYPE_DATE ##### -->
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<para>
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The #GType for #GDate.
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</para>
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<!-- ##### MACRO G_TYPE_GSTRING ##### -->
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<para>
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The #GType for #GString.
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</para>
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<!-- ##### MACRO G_TYPE_STRV ##### -->
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<para>
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The #GType for a boxed type holding a %NULL-terminated array of strings.
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</para>
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<para>
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The code fragments in the following example show the use of a property of
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type #G_TYPE_STRV with g_object_class_install_property(), g_object_set()
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and g_object_get().
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</para>
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<informalexample><programlisting>
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g_object_class_install_property (object_class,
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PROP_AUTHORS,
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g_param_spec_boxed ("authors",
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_("Authors"),
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_("List of authors"),
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G_TYPE_STRV,
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G_PARAM_READWRITE));
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gchar *authors[] = { "Owen", "Tim", NULL };
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g_object_set (obj, "authors", authors, NULL);
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gchar *writers[];
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g_object_get (obj, "authors", &writers, NULL);
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/* do something with writers */
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g_strfreev (writers);
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</programlisting></informalexample>
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@Since: 2.4
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<!-- ##### MACRO G_TYPE_REGEX ##### -->
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<para>
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The #GType for a boxed type holding a #GRegex reference.
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</para>
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@Since: 2.14
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<!-- ##### TYPEDEF GStrv ##### -->
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<para>
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A C representable type name for #G_TYPE_STRV.
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</para>
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