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  • Committer: Bazaar Package Importer
  • Author(s): Jamie Strandboge
  • Date: 2009-03-12 16:46:11 UTC
  • mfrom: (67.1.7 hardy-proposed)
  • Revision ID: james.westby@ubuntu.com-20090312164611-31v55ts0v0j0u06k
Tags: 2.16.6-0ubuntu1.1
* SECURITY UPDATE: possible arbitrary code execution when processing large
  Base64 strings
  - debian/patches/91_CVE-2008-4316.patch: update glib/gbase64.c to properly
    verify the string length and set the length of the output buffer.
  - CVE-2008-4316

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docs/reference/gobject/xml/generic_values.xml
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<refentry id="gobject-Generic-values">
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<refmeta>
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<refentrytitle role="top_of_page">Generic Values</refentrytitle>
 
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<refentrytitle role="top_of_page" id="gobject-Generic-values.top_of_page">Generic Values</refentrytitle>
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<manvolnum>3</manvolnum>
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<refmiscinfo>GOBJECT Library</refmiscinfo>
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</refmeta>
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<!--[<xref linkend="desc" endterm="desc.title"/>]-->
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</refnamediv>
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<refsynopsisdiv role="synopsis">
 
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<refsynopsisdiv id="gobject-Generic-values.synopsis" role="synopsis">
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<title role="synopsis.title">Synopsis</title>
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<synopsis>
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#include &lt;glib-object.h&gt;
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#define             <link linkend="G-VALUE-HOLDS:CAPS">G_VALUE_HOLDS</link>                       (value,type)
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#define             <link linkend="G-VALUE-TYPE:CAPS">G_VALUE_TYPE</link>                        (value)
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#define             <link linkend="G-VALUE-TYPE-NAME:CAPS">G_VALUE_TYPE_NAME</link>                   (value)
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                                                         <link linkend="GType">GType</link> dest_type,
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                                                         <link linkend="GValueTransform">GValueTransform</link> transform_func);
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<link linkend="gchar">gchar</link>*              <link linkend="g-strdup-value-contents">g_strdup_value_contents</link>             (const <link linkend="GValue">GValue</link> *value);
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</synopsis>
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</refsynopsisdiv>
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<refsect1 role="desc">
 
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<refsect1 id="gobject-Generic-values.description" role="desc">
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<title role="desc.title">Description</title>
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<para>
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The <link linkend="GValue"><type>GValue</type></link> structure is basically a variable container that consists
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</para>
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</refsect1>
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<refsect1 role="details">
 
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<refsect1 id="gobject-Generic-values.details" role="details">
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<title role="details.title">Details</title>
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<refsect2>
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<title><anchor id="G-VALUE-HOLDS:CAPS" role="macro"/>G_VALUE_HOLDS()</title>
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<indexterm><primary>G_VALUE_HOLDS</primary></indexterm><programlisting>#define G_VALUE_HOLDS(value,type)        (G_TYPE_CHECK_VALUE_TYPE ((value), (type)))
 
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<refsect2 id="G-VALUE-HOLDS:CAPS" role="macro">
 
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<title>G_VALUE_HOLDS()</title>
 
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<indexterm zone="G-VALUE-HOLDS:CAPS"><primary>G_VALUE_HOLDS</primary></indexterm><programlisting>#define G_VALUE_HOLDS(value,type)      (G_TYPE_CHECK_VALUE_TYPE ((value), (type)))
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</programlisting>
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<para>
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Returns <link linkend="TRUE:CAPS"><literal>TRUE</literal></link> if <parameter>value</parameter> holds (or contains) a value of <parameter>type</parameter>.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="G-VALUE-TYPE:CAPS" role="macro"/>G_VALUE_TYPE()</title>
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<indexterm><primary>G_VALUE_TYPE</primary></indexterm><programlisting>#define   G_VALUE_TYPE(value)             (((GValue*) (value))-&gt;g_type)
 
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<refsect2 id="G-VALUE-TYPE:CAPS" role="macro">
 
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<title>G_VALUE_TYPE()</title>
 
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<indexterm zone="G-VALUE-TYPE:CAPS"><primary>G_VALUE_TYPE</primary></indexterm><programlisting>#define  G_VALUE_TYPE(value)             (((GValue*) (value))-&gt;g_type)
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</programlisting>
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<para>
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Returns the type identifier of <parameter>value</parameter>.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="G-VALUE-TYPE-NAME:CAPS" role="macro"/>G_VALUE_TYPE_NAME()</title>
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<indexterm><primary>G_VALUE_TYPE_NAME</primary></indexterm><programlisting>#define      G_VALUE_TYPE_NAME(value)        (g_type_name (G_VALUE_TYPE (value)))
 
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<refsect2 id="G-VALUE-TYPE-NAME:CAPS" role="macro">
 
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<title>G_VALUE_TYPE_NAME()</title>
 
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<indexterm zone="G-VALUE-TYPE-NAME:CAPS"><primary>G_VALUE_TYPE_NAME</primary></indexterm><programlisting>#define        G_VALUE_TYPE_NAME(value)        (g_type_name (G_VALUE_TYPE (value)))
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</programlisting>
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<para>
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Returns the type name of <parameter>value</parameter>.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="G-TYPE-IS-VALUE:CAPS" role="macro"/>G_TYPE_IS_VALUE()</title>
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<indexterm><primary>G_TYPE_IS_VALUE</primary></indexterm><programlisting>#define        G_TYPE_IS_VALUE(type)           (g_type_check_is_value_type (type))
 
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<refsect2 id="G-TYPE-IS-VALUE:CAPS" role="macro">
 
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<title>G_TYPE_IS_VALUE()</title>
 
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<indexterm zone="G-TYPE-IS-VALUE:CAPS"><primary>G_TYPE_IS_VALUE</primary></indexterm><programlisting>#define    G_TYPE_IS_VALUE(type)           (g_type_check_is_value_type (type))
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</programlisting>
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<para>
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Return whether the passed in type ID can be used for <link linkend="g-value-init"><function>g_value_init()</function></link>.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="G-TYPE-IS-VALUE-ABSTRACT:CAPS" role="macro"/>G_TYPE_IS_VALUE_ABSTRACT()</title>
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<indexterm><primary>G_TYPE_IS_VALUE_ABSTRACT</primary></indexterm><programlisting>#define G_TYPE_IS_VALUE_ABSTRACT(type)          (g_type_test_flags ((type), G_TYPE_FLAG_VALUE_ABSTRACT))
 
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<refsect2 id="G-TYPE-IS-VALUE-ABSTRACT:CAPS" role="macro">
 
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<title>G_TYPE_IS_VALUE_ABSTRACT()</title>
 
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<indexterm zone="G-TYPE-IS-VALUE-ABSTRACT:CAPS"><primary>G_TYPE_IS_VALUE_ABSTRACT</primary></indexterm><programlisting>#define G_TYPE_IS_VALUE_ABSTRACT(type)          (g_type_test_flags ((type), G_TYPE_FLAG_VALUE_ABSTRACT))
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</programlisting>
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<para>
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Returns <link linkend="TRUE:CAPS"><literal>TRUE</literal></link> if <parameter>type</parameter> is an abstract value type.  An abstract value type 
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="G-IS-VALUE:CAPS" role="macro"/>G_IS_VALUE()</title>
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<indexterm><primary>G_IS_VALUE</primary></indexterm><programlisting>#define     G_IS_VALUE(value)               (G_TYPE_CHECK_VALUE (value))
 
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<refsect2 id="G-IS-VALUE:CAPS" role="macro">
 
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<title>G_IS_VALUE()</title>
 
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<indexterm zone="G-IS-VALUE:CAPS"><primary>G_IS_VALUE</primary></indexterm><programlisting>#define      G_IS_VALUE(value)               (G_TYPE_CHECK_VALUE (value))
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</programlisting>
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<para>
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Returns <link linkend="TRUE:CAPS"><literal>TRUE</literal></link> if <parameter>value</parameter> is a valid and initialized <link linkend="GValue"><type>GValue</type></link> structure.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="GValue" role="struct"/>GValue</title>
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<indexterm><primary>GValue</primary></indexterm><programlisting>typedef struct {
 
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<refsect2 id="GValue" role="struct">
 
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<title>GValue</title>
 
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<indexterm zone="GValue"><primary>GValue</primary></indexterm><programlisting>typedef struct {
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} GValue;
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</programlisting>
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<para>
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within the 2 element <parameter>data</parameter> union, and the <parameter>g_type</parameter> member should
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only be accessed through the <link linkend="G-VALUE-TYPE:CAPS"><function>G_VALUE_TYPE()</function></link> macro.
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</para></refsect2>
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<refsect2>
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<title><anchor id="G-TYPE-VALUE:CAPS" role="macro"/>G_TYPE_VALUE</title>
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<indexterm><primary>G_TYPE_VALUE</primary></indexterm><programlisting>#define   G_TYPE_VALUE            (g_value_get_type ())
 
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<refsect2 id="G-TYPE-VALUE:CAPS" role="macro">
 
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<title>G_TYPE_VALUE</title>
 
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<indexterm zone="G-TYPE-VALUE:CAPS"><primary>G_TYPE_VALUE</primary></indexterm><programlisting>#define  G_TYPE_VALUE            (g_value_get_type ())
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</programlisting>
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<para>
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Returns the type ID of the "GValue" type which is a boxed type,
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used to pass around pointers to GValues.
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</para></refsect2>
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<refsect2>
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<title><anchor id="G-TYPE-VALUE-ARRAY:CAPS" role="macro"/>G_TYPE_VALUE_ARRAY</title>
198
 
<indexterm><primary>G_TYPE_VALUE_ARRAY</primary></indexterm><programlisting>#define     G_TYPE_VALUE_ARRAY      (g_value_array_get_type ())
 
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<refsect2 id="G-TYPE-VALUE-ARRAY:CAPS" role="macro">
 
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<title>G_TYPE_VALUE_ARRAY</title>
 
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<indexterm zone="G-TYPE-VALUE-ARRAY:CAPS"><primary>G_TYPE_VALUE_ARRAY</primary></indexterm><programlisting>#define      G_TYPE_VALUE_ARRAY      (g_value_array_get_type ())
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</programlisting>
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<para>
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Returns the type ID of the "GValueArray" type which is a boxed type,
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used to pass around pointers to GValueArrays.
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</para></refsect2>
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<refsect2>
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<title><anchor id="g-value-init" role="function"/>g_value_init ()</title>
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<indexterm><primary>g_value_init</primary></indexterm><programlisting><link linkend="GValue">GValue</link>*             g_value_init                        (<link linkend="GValue">GValue</link> *value,
 
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<refsect2 id="g-value-init" role="function">
 
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<title>g_value_init ()</title>
 
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<indexterm zone="g-value-init"><primary>g_value_init</primary></indexterm><programlisting><link linkend="GValue">GValue</link>*             g_value_init                        (<link linkend="GValue">GValue</link> *value,
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                                                         <link linkend="GType">GType</link> g_type);</programlisting>
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<para>
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Initializes <parameter>value</parameter> with the default value of <parameter>type</parameter>.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="g-value-copy" role="function"/>g_value_copy ()</title>
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<indexterm><primary>g_value_copy</primary></indexterm><programlisting><link linkend="void">void</link>                g_value_copy                        (const <link linkend="GValue">GValue</link> *src_value,
 
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<refsect2 id="g-value-copy" role="function">
 
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<title>g_value_copy ()</title>
 
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<indexterm zone="g-value-copy"><primary>g_value_copy</primary></indexterm><programlisting><link linkend="void">void</link>                g_value_copy                        (const <link linkend="GValue">GValue</link> *src_value,
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                                                         <link linkend="GValue">GValue</link> *dest_value);</programlisting>
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<para>
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Copies the value of <parameter>src_value</parameter> into <parameter>dest_value</parameter>.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="g-value-reset" role="function"/>g_value_reset ()</title>
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<indexterm><primary>g_value_reset</primary></indexterm><programlisting><link linkend="GValue">GValue</link>*             g_value_reset                       (<link linkend="GValue">GValue</link> *value);</programlisting>
 
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<refsect2 id="g-value-reset" role="function">
 
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<title>g_value_reset ()</title>
 
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<indexterm zone="g-value-reset"><primary>g_value_reset</primary></indexterm><programlisting><link linkend="GValue">GValue</link>*             g_value_reset                       (<link linkend="GValue">GValue</link> *value);</programlisting>
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<para>
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Clears the current value in <parameter>value</parameter> and resets it to the default value
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(as if the value had just been initialized).
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="g-value-unset" role="function"/>g_value_unset ()</title>
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<indexterm><primary>g_value_unset</primary></indexterm><programlisting><link linkend="void">void</link>                g_value_unset                       (<link linkend="GValue">GValue</link> *value);</programlisting>
 
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<refsect2 id="g-value-unset" role="function">
 
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<title>g_value_unset ()</title>
 
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<indexterm zone="g-value-unset"><primary>g_value_unset</primary></indexterm><programlisting><link linkend="void">void</link>                g_value_unset                       (<link linkend="GValue">GValue</link> *value);</programlisting>
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<para>
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Clears the current value in <parameter>value</parameter> and "unsets" the type,
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this releases all resources associated with this GValue.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="g-value-set-instance" role="function"/>g_value_set_instance ()</title>
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<indexterm><primary>g_value_set_instance</primary></indexterm><programlisting><link linkend="void">void</link>                g_value_set_instance                (<link linkend="GValue">GValue</link> *value,
 
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<refsect2 id="g-value-set-instance" role="function">
 
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<title>g_value_set_instance ()</title>
 
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<indexterm zone="g-value-set-instance"><primary>g_value_set_instance</primary></indexterm><programlisting><link linkend="void">void</link>                g_value_set_instance                (<link linkend="GValue">GValue</link> *value,
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                                                         <link linkend="gpointer">gpointer</link> instance);</programlisting>
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<para>
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Sets <parameter>value</parameter> from an instantiatable type via the 
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="g-value-fits-pointer" role="function"/>g_value_fits_pointer ()</title>
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<indexterm><primary>g_value_fits_pointer</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link>            g_value_fits_pointer                (const <link linkend="GValue">GValue</link> *value);</programlisting>
 
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<refsect2 id="g-value-fits-pointer" role="function">
 
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<title>g_value_fits_pointer ()</title>
 
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<indexterm zone="g-value-fits-pointer"><primary>g_value_fits_pointer</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link>            g_value_fits_pointer                (const <link linkend="GValue">GValue</link> *value);</programlisting>
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<para>
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Determines if <parameter>value</parameter> will fit inside the size of a pointer value.
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This is an internal function introduced mainly for C marshallers.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
301
 
<title><anchor id="g-value-peek-pointer" role="function"/>g_value_peek_pointer ()</title>
302
 
<indexterm><primary>g_value_peek_pointer</primary></indexterm><programlisting><link linkend="gpointer">gpointer</link>            g_value_peek_pointer                (const <link linkend="GValue">GValue</link> *value);</programlisting>
 
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<refsect2 id="g-value-peek-pointer" role="function">
 
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<title>g_value_peek_pointer ()</title>
 
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<indexterm zone="g-value-peek-pointer"><primary>g_value_peek_pointer</primary></indexterm><programlisting><link linkend="gpointer">gpointer</link>            g_value_peek_pointer                (const <link linkend="GValue">GValue</link> *value);</programlisting>
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<para>
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Return the value contents as pointer. This function asserts that
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<link linkend="g-value-fits-pointer"><function>g_value_fits_pointer()</function></link> returned <link linkend="TRUE:CAPS"><literal>TRUE</literal></link> for the passed in value.
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
317
 
<title><anchor id="g-value-type-compatible" role="function"/>g_value_type_compatible ()</title>
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<indexterm><primary>g_value_type_compatible</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link>            g_value_type_compatible             (<link linkend="GType">GType</link> src_type,
 
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<refsect2 id="g-value-type-compatible" role="function">
 
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<title>g_value_type_compatible ()</title>
 
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<indexterm zone="g-value-type-compatible"><primary>g_value_type_compatible</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link>            g_value_type_compatible             (<link linkend="GType">GType</link> src_type,
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                                                         <link linkend="GType">GType</link> dest_type);</programlisting>
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<para>
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Returns whether a <link linkend="GValue"><type>GValue</type></link> of type <parameter>src_type</parameter> can be copied into
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
336
 
<title><anchor id="g-value-type-transformable" role="function"/>g_value_type_transformable ()</title>
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<indexterm><primary>g_value_type_transformable</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link>            g_value_type_transformable          (<link linkend="GType">GType</link> src_type,
 
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<refsect2 id="g-value-type-transformable" role="function">
 
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<title>g_value_type_transformable ()</title>
 
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<indexterm zone="g-value-type-transformable"><primary>g_value_type_transformable</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link>            g_value_type_transformable          (<link linkend="GType">GType</link> src_type,
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                                                         <link linkend="GType">GType</link> dest_type);</programlisting>
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<para>
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Check whether <link linkend="g-value-transform"><function>g_value_transform()</function></link> is able to transform values
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
355
 
<title><anchor id="g-value-transform" role="function"/>g_value_transform ()</title>
356
 
<indexterm><primary>g_value_transform</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link>            g_value_transform                   (const <link linkend="GValue">GValue</link> *src_value,
 
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<refsect2 id="g-value-transform" role="function">
 
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<title>g_value_transform ()</title>
 
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<indexterm zone="g-value-transform"><primary>g_value_transform</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link>            g_value_transform                   (const <link linkend="GValue">GValue</link> *src_value,
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                                                         <link linkend="GValue">GValue</link> *dest_value);</programlisting>
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<para>
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Tries to cast the contents of <parameter>src_value</parameter> into a type appropriate
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
380
 
<title><anchor id="GValueTransform" role="function"/>GValueTransform ()</title>
381
 
<indexterm><primary>GValueTransform</primary></indexterm><programlisting><link linkend="void">void</link>                (*GValueTransform)                  (const <link linkend="GValue">GValue</link> *src_value,
 
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<refsect2 id="GValueTransform" role="function">
 
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<title>GValueTransform ()</title>
 
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<indexterm zone="GValueTransform"><primary>GValueTransform</primary></indexterm><programlisting><link linkend="void">void</link>                (*GValueTransform)                  (const <link linkend="GValue">GValue</link> *src_value,
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                                                         <link linkend="GValue">GValue</link> *dest_value);</programlisting>
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<para>
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The type of value transformation functions which can be registered with
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="g-value-register-transform-func" role="function"/>g_value_register_transform_func ()</title>
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<indexterm><primary>g_value_register_transform_func</primary></indexterm><programlisting><link linkend="void">void</link>                g_value_register_transform_func     (<link linkend="GType">GType</link> src_type,
 
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<refsect2 id="g-value-register-transform-func" role="function">
 
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<title>g_value_register_transform_func ()</title>
 
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<indexterm zone="g-value-register-transform-func"><primary>g_value_register_transform_func</primary></indexterm><programlisting><link linkend="void">void</link>                g_value_register_transform_func     (<link linkend="GType">GType</link> src_type,
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                                                         <link linkend="GType">GType</link> dest_type,
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                                                         <link linkend="GValueTransform">GValueTransform</link> transform_func);</programlisting>
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<para>
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</simpara></listitem></varlistentry>
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</variablelist></refsect2>
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<refsect2>
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<title><anchor id="g-strdup-value-contents" role="function"/>g_strdup_value_contents ()</title>
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<indexterm><primary>g_strdup_value_contents</primary></indexterm><programlisting><link linkend="gchar">gchar</link>*              g_strdup_value_contents             (const <link linkend="GValue">GValue</link> *value);</programlisting>
 
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<refsect2 id="g-strdup-value-contents" role="function">
 
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<title>g_strdup_value_contents ()</title>
 
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<indexterm zone="g-strdup-value-contents"><primary>g_strdup_value_contents</primary></indexterm><programlisting><link linkend="gchar">gchar</link>*              g_strdup_value_contents             (const <link linkend="GValue">GValue</link> *value);</programlisting>
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<para>
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Return a newly allocated string, which describes the contents of a <link linkend="GValue"><type>GValue</type></link>.
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The main purpose of this function is to describe <link linkend="GValue"><type>GValue</type></link> contents for 
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<refsect1>
 
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<refsect1 id="gobject-Generic-values.see-also">
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<title>See Also</title>
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<para>
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The fundamental types which all support <link linkend="GValue"><type>GValue</type></link> operations and thus
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</para>
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</refsect1>
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<refsect1><refsect2 /><refsect2 /></refsect1>
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</refentry>