1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
<!-- ##### SECTION Title ##### -->
GBoxed
<!-- ##### SECTION Short_Description ##### -->
A mechanism to wrap opaque C structures registered by the type system
<!-- ##### SECTION Long_Description ##### -->
<para>
GBoxed is a generic wrapper mechanism for arbitrary C structures. The only
thing the type system needs to know about the structures is how to copy and
free them, beyond that they are treated as opaque chunks of memory.
</para>
<para>
Boxed types are useful for simple value-holder structures like rectangles or
points. They can also be used for wrapping structures defined in non-GObject
based libraries.
</para>
<!-- ##### SECTION See_Also ##### -->
<para>
#GParamSpecBoxed, g_param_spec_boxed()
</para>
<!-- ##### SECTION Stability_Level ##### -->
<!-- ##### USER_FUNCTION GBoxedCopyFunc ##### -->
<para>
This function is provided by the user and should produce a copy of the passed
in boxed structure.
</para>
@boxed: The boxed structure to be copied.
@Returns: The newly created copy of the boxed structure.
<!-- ##### USER_FUNCTION GBoxedFreeFunc ##### -->
<para>
This function is provided by the user and should free the boxed
structure passed.
</para>
@boxed: The boxed structure to be freed.
<!-- ##### FUNCTION g_boxed_copy ##### -->
<para>
Provide a copy of a boxed structure @src_boxed which is of type @boxed_type.
</para>
@boxed_type: The type of @src_boxed.
@src_boxed: The boxed structure to be copied.
@Returns: The newly created copy of the boxed structure.
<!-- ##### FUNCTION g_boxed_free ##### -->
<para>
Free the boxed structure @boxed which is of type @boxed_type.
</para>
@boxed_type: The type of @boxed.
@boxed: The boxed structure to be freed.
<!-- ##### FUNCTION g_boxed_type_register_static ##### -->
<para>
This function creates a new %G_TYPE_BOXED derived type id for a new
boxed type with name @name. Boxed type handling functions have to be
provided to copy and free opaque boxed structures of this type.
</para>
@name: Name of the new boxed type.
@boxed_copy: Boxed structure copy function.
@boxed_free: Boxed structure free function.
@Returns: New %G_TYPE_BOXED derived type id for @name.
<!-- ##### FUNCTION g_pointer_type_register_static ##### -->
<para>
Creates a new %G_TYPE_POINTER derived type id for a new
pointer type with name @name.
</para>
@name: the name of the new pointer type.
@Returns: a new %G_TYPE_POINTER derived type id for @name.
<!-- ##### MACRO G_TYPE_HASH_TABLE ##### -->
<para>
The #GType for a boxed type holding a #GHashTable reference.
</para>
@Since: 2.10
<!-- ##### MACRO G_TYPE_DATE ##### -->
<para>
The #GType for #GDate.
</para>
<!-- ##### MACRO G_TYPE_GSTRING ##### -->
<para>
The #GType for #GString.
</para>
<!-- ##### MACRO G_TYPE_STRV ##### -->
<para>
The #GType for a boxed type holding a %NULL-terminated array of strings.
</para>
<para>
The code fragments in the following example show the use of a property of
type #G_TYPE_STRV with g_object_class_install_property(), g_object_set()
and g_object_get().
</para>
<informalexample><programlisting>
g_object_class_install_property (object_class,
PROP_AUTHORS,
g_param_spec_boxed ("authors",
_("Authors"),
_("List of authors"),
G_TYPE_STRV,
G_PARAM_READWRITE));
gchar *authors[] = { "Owen", "Tim", NULL };
g_object_set (obj, "authors", authors, NULL);
gchar *writers[];
g_object_get (obj, "authors", &writers, NULL);
/* do something with writers */
g_strfreev (writers);
</programlisting></informalexample>
@Since: 2.4
<!-- ##### TYPEDEF GStrv ##### -->
<para>
A C representable type name for #G_TYPE_STRV.
</para>
|
