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 <div class="refentry" title="Varargs Value Collection">
 <a name="gobject-Varargs-Value-Collection"></a><div class="titlepage"></div>
 <div class="refnamediv"><table width="100%"><tr>
 <td valign="top">
 <h2><span class="refentrytitle"><a name="gobject-Varargs-Value-Collection.top_of_page"></a>Varargs Value Collection</span></h2>
 <p>Varargs Value Collection — Converting varargs to generic values</p>
 </td>
 <td valign="top" align="right"></td>
 </tr></table></div>
 <div class="refsynopsisdiv" title="Synopsis">
 <a name="gobject-Varargs-Value-Collection.synopsis"></a><h2>Synopsis</h2>
 <pre class="synopsis">
 #include &lt;glib-object.h&gt;
 #include &lt;gobject/gvaluecollector.h&gt;

 union               <a class="link" href="gobject-Varargs-Value-Collection.html#GTypeCValue" title="union GTypeCValue">GTypeCValue</a>;
 #define             <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-INIT:CAPS" title="G_VALUE_COLLECT_INIT()">G_VALUE_COLLECT_INIT</a>                (value,
                                                          _value_type,
                                                          var_args,
                                                          flags,
                                                          __error)
 #define             <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()">G_VALUE_COLLECT</a>                     (value,
                                                          var_args,
                                                          flags,
                                                          __error)
 #define             <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-LCOPY:CAPS" title="G_VALUE_LCOPY()">G_VALUE_LCOPY</a>                       (value,
                                                          var_args,
                                                          flags,
                                                          __error)
 #define             <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-FORMAT-MAX-LENGTH:CAPS" title="G_VALUE_COLLECT_FORMAT_MAX_LENGTH">G_VALUE_COLLECT_FORMAT_MAX_LENGTH</a>
 </pre>
 </div>
 <div class="refsect1" title="Description">
 <a name="gobject-Varargs-Value-Collection.description"></a><h2>Description</h2>
 <p>
 The macros in this section provide the varargs parsing support needed
 in variadic GObject functions such as <a class="link" href="gobject-The-Base-Object-Type.html#g-object-new" title="g_object_new ()"><code class="function">g_object_new()</code></a> or <a class="link" href="gobject-The-Base-Object-Type.html#g-object-set" title="g_object_set ()"><code class="function">g_object_set()</code></a>.
 They currently support the collection of integral types, floating point
 types and pointers.
 </p>
 </div>
 <div class="refsect1" title="Details">
 <a name="gobject-Varargs-Value-Collection.details"></a><h2>Details</h2>
 <div class="refsect2" title="union GTypeCValue">
 <a name="GTypeCValue"></a><h3>union GTypeCValue</h3>
 <pre class="programlisting">union _GTypeCValue
 {
   gint     v_int;
   glong    v_long;
   gint64   v_int64;
   gdouble  v_double;
   gpointer v_pointer;
 };
 </pre>
 <p>
 A union holding one collected value.
 </p>
 </div>
 <hr>
 <div class="refsect2" title="G_VALUE_COLLECT_INIT()">
 <a name="G-VALUE-COLLECT-INIT:CAPS"></a><h3>G_VALUE_COLLECT_INIT()</h3>
 <pre class="programlisting">#define             G_VALUE_COLLECT_INIT(value, _value_type, var_args, flags, __error)</pre>
 <p>
 Collects a variable argument value from a va_list. We have to
 implement the varargs collection as a macro, because on some systems
 va_list variables cannot be passed by reference.
 </p>
 <div class="variablelist"><table border="0">
 <col align="left" valign="top">
 <tbody>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
 <td>a <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> return location. <em class="parameter"><code>value</code></em> must contain only 0 bytes.
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>_value_type</code></em> :</span></p></td>
 <td>the <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> to use for <em class="parameter"><code>value</code></em>.
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>var_args</code></em> :</span></p></td>
 <td>the va_list variable; it may be evaluated multiple times
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
 <td>flags which are passed on to the <code class="function">collect_value()</code> function of
  the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em>.
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>__error</code></em> :</span></p></td>
 <td>a <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="./../glib/glib/glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a>
  allocated error messages if something fails
 </td>
 </tr>
 </tbody>
 </table></div>
 <p class="since">Since 2.24</p>
 </div>
 <hr>
 <div class="refsect2" title="G_VALUE_COLLECT()">
 <a name="G-VALUE-COLLECT:CAPS"></a><h3>G_VALUE_COLLECT()</h3>
 <pre class="programlisting">#define             G_VALUE_COLLECT(value, var_args, flags, __error)</pre>
 <p>
 Collects a variable argument value from a va_list. We have to
 implement the varargs collection as a macro, because on some systems
 va_list variables cannot be passed by reference.
 </p>
 <p>
 Note: If you are creating the <em class="parameter"><code>value</code></em> argument just before calling this macro,
 you should use the <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-INIT:CAPS" title="G_VALUE_COLLECT_INIT()"><span class="type">G_VALUE_COLLECT_INIT</span></a> variant and pass the unitialized
 <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a>. That variant is faster than <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()"><span class="type">G_VALUE_COLLECT</span></a>.
 </p>
 <div class="variablelist"><table border="0">
 <col align="left" valign="top">
 <tbody>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
 <td>a <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> return location. <em class="parameter"><code>value</code></em> is supposed to be initialized
  according to the value type to be collected
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>var_args</code></em> :</span></p></td>
 <td>the va_list variable; it may be evaluated multiple times
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
 <td>flags which are passed on to the <code class="function">collect_value()</code> function of
  the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em>.
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>__error</code></em> :</span></p></td>
 <td>a <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="./../glib/glib/glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a>
  allocated error messages if something fails
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <hr>
 <div class="refsect2" title="G_VALUE_LCOPY()">
 <a name="G-VALUE-LCOPY:CAPS"></a><h3>G_VALUE_LCOPY()</h3>
 <pre class="programlisting">#define             G_VALUE_LCOPY(value, var_args, flags, __error)</pre>
 <p>
 Collects a value's variable argument locations from a va_list. Usage is
 analogous to <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()"><code class="function">G_VALUE_COLLECT()</code></a>.
 </p>
 <div class="variablelist"><table border="0">
 <col align="left" valign="top">
 <tbody>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
 <td>a <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> return location. <em class="parameter"><code>value</code></em> is supposed to be initialized
  according to the value type to be collected
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>var_args</code></em> :</span></p></td>
 <td>the va_list variable; it may be evaluated multiple times
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
 <td>flags which are passed on to the <code class="function">lcopy_value()</code> function of
  the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em>.
 </td>
 </tr>
 <tr>
 <td><p><span class="term"><em class="parameter"><code>__error</code></em> :</span></p></td>
 <td>a <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="./../glib/glib/glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a>
  allocated error messages if something fails
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <hr>
 <div class="refsect2" title="G_VALUE_COLLECT_FORMAT_MAX_LENGTH">
 <a name="G-VALUE-COLLECT-FORMAT-MAX-LENGTH:CAPS"></a><h3>G_VALUE_COLLECT_FORMAT_MAX_LENGTH</h3>
 <pre class="programlisting">#define G_VALUE_COLLECT_FORMAT_MAX_LENGTH (8)
 </pre>
 <p>
 The maximal number of <a class="link" href="gobject-Varargs-Value-Collection.html#GTypeCValue" title="union GTypeCValue"><span class="type">GTypeCValue</span></a>s which can be collected for a
 single <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a>.
 </p>
 </div>
 </div>
 <div class="refsect1" title="See Also">
 <a name="gobject-Varargs-Value-Collection.see-also"></a><h2>See Also</h2>
 <span class="type">GValueTable</span>
 </div>
 </div>
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	</td></tr>
	</table>
	<div class="refentry" title="Varargs Value Collection">
	<a name="gobject-Varargs-Value-Collection"></a><div class="titlepage"></div>
	<div class="refnamediv"><table width="100%"><tr>
	<td valign="top">
	<h2><span class="refentrytitle"><a name="gobject-Varargs-Value-Collection.top_of_page"></a>Varargs Value Collection</span></h2>
	<p>Varargs Value Collection — Converting varargs to generic values</p>
	</td>
	<td valign="top" align="right"></td>
	</tr></table></div>
	<div class="refsynopsisdiv" title="Synopsis">
	<a name="gobject-Varargs-Value-Collection.synopsis"></a><h2>Synopsis</h2>
	<pre class="synopsis">
	#include <glib-object.h>
	#include <gobject/gvaluecollector.h>

	union <a class="link" href="gobject-Varargs-Value-Collection.html#GTypeCValue" title="union GTypeCValue">GTypeCValue</a>;
	#define <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-INIT:CAPS" title="G_VALUE_COLLECT_INIT()">G_VALUE_COLLECT_INIT</a> (value,
	_value_type,
	var_args,
	flags,
	__error)
	#define <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()">G_VALUE_COLLECT</a> (value,
	var_args,
	flags,
	__error)
	#define <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-LCOPY:CAPS" title="G_VALUE_LCOPY()">G_VALUE_LCOPY</a> (value,
	var_args,
	flags,
	__error)
	#define <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-FORMAT-MAX-LENGTH:CAPS" title="G_VALUE_COLLECT_FORMAT_MAX_LENGTH">G_VALUE_COLLECT_FORMAT_MAX_LENGTH</a>
	</pre>
	</div>
	<div class="refsect1" title="Description">
	<a name="gobject-Varargs-Value-Collection.description"></a><h2>Description</h2>
	<p>
	The macros in this section provide the varargs parsing support needed
	in variadic GObject functions such as <a class="link" href="gobject-The-Base-Object-Type.html#g-object-new" title="g_object_new ()"><code class="function">g_object_new()</code></a> or <a class="link" href="gobject-The-Base-Object-Type.html#g-object-set" title="g_object_set ()"><code class="function">g_object_set()</code></a>.
	They currently support the collection of integral types, floating point
	types and pointers.
	</p>
	</div>
	<div class="refsect1" title="Details">
	<a name="gobject-Varargs-Value-Collection.details"></a><h2>Details</h2>
	<div class="refsect2" title="union GTypeCValue">
	<a name="GTypeCValue"></a><h3>union GTypeCValue</h3>
	<pre class="programlisting">union _GTypeCValue
	{
	gint v_int;
	glong v_long;
	gint64 v_int64;
	gdouble v_double;
	gpointer v_pointer;
	};
	</pre>
	<p>
	A union holding one collected value.
	</p>
	</div>
	<hr>
	<div class="refsect2" title="G_VALUE_COLLECT_INIT()">
	<a name="G-VALUE-COLLECT-INIT:CAPS"></a><h3>G_VALUE_COLLECT_INIT()</h3>
	<pre class="programlisting">#define G_VALUE_COLLECT_INIT(value, _value_type, var_args, flags, __error)</pre>
	<p>
	Collects a variable argument value from a va_list. We have to
	implement the varargs collection as a macro, because on some systems
	va_list variables cannot be passed by reference.
	</p>
	<div class="variablelist"><table border="0">
	<col align="left" valign="top">
	<tbody>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
	<td>a <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> return location. <em class="parameter"><code>value</code></em> must contain only 0 bytes.
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>_value_type</code></em> :</span></p></td>
	<td>the <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> to use for <em class="parameter"><code>value</code></em>.
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>var_args</code></em> :</span></p></td>
	<td>the va_list variable; it may be evaluated multiple times
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
	<td>flags which are passed on to the <code class="function">collect_value()</code> function of
	the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em>.
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>__error</code></em> :</span></p></td>
	<td>a <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="./../glib/glib/glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a>
	allocated error messages if something fails
	</td>
	</tr>
	</tbody>
	</table></div>
	<p class="since">Since 2.24</p>
	</div>
	<hr>
	<div class="refsect2" title="G_VALUE_COLLECT()">
	<a name="G-VALUE-COLLECT:CAPS"></a><h3>G_VALUE_COLLECT()</h3>
	<pre class="programlisting">#define G_VALUE_COLLECT(value, var_args, flags, __error)</pre>
	<p>
	Collects a variable argument value from a va_list. We have to
	implement the varargs collection as a macro, because on some systems
	va_list variables cannot be passed by reference.
	</p>
	<p>
	Note: If you are creating the <em class="parameter"><code>value</code></em> argument just before calling this macro,
	you should use the <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-INIT:CAPS" title="G_VALUE_COLLECT_INIT()"><span class="type">G_VALUE_COLLECT_INIT</span></a> variant and pass the unitialized
	<a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a>. That variant is faster than <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()"><span class="type">G_VALUE_COLLECT</span></a>.
	</p>
	<div class="variablelist"><table border="0">
	<col align="left" valign="top">
	<tbody>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
	<td>a <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> return location. <em class="parameter"><code>value</code></em> is supposed to be initialized
	according to the value type to be collected
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>var_args</code></em> :</span></p></td>
	<td>the va_list variable; it may be evaluated multiple times
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
	<td>flags which are passed on to the <code class="function">collect_value()</code> function of
	the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em>.
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>__error</code></em> :</span></p></td>
	<td>a <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="./../glib/glib/glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a>
	allocated error messages if something fails
	</td>
	</tr>
	</tbody>
	</table></div>
	</div>
	<hr>
	<div class="refsect2" title="G_VALUE_LCOPY()">
	<a name="G-VALUE-LCOPY:CAPS"></a><h3>G_VALUE_LCOPY()</h3>
	<pre class="programlisting">#define G_VALUE_LCOPY(value, var_args, flags, __error)</pre>
	<p>
	Collects a value's variable argument locations from a va_list. Usage is
	analogous to <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()"><code class="function">G_VALUE_COLLECT()</code></a>.
	</p>
	<div class="variablelist"><table border="0">
	<col align="left" valign="top">
	<tbody>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
	<td>a <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> return location. <em class="parameter"><code>value</code></em> is supposed to be initialized
	according to the value type to be collected
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>var_args</code></em> :</span></p></td>
	<td>the va_list variable; it may be evaluated multiple times
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
	<td>flags which are passed on to the <code class="function">lcopy_value()</code> function of
	the <a class="link" href="gobject-Type-Information.html#GTypeValueTable" title="GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em>.
	</td>
	</tr>
	<tr>
	<td><p><span class="term"><em class="parameter"><code>__error</code></em> :</span></p></td>
	<td>a <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="./../glib/glib/glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a>
	allocated error messages if something fails
	</td>
	</tr>
	</tbody>
	</table></div>
	</div>
	<hr>
	<div class="refsect2" title="G_VALUE_COLLECT_FORMAT_MAX_LENGTH">
	<a name="G-VALUE-COLLECT-FORMAT-MAX-LENGTH:CAPS"></a><h3>G_VALUE_COLLECT_FORMAT_MAX_LENGTH</h3>
	<pre class="programlisting">#define G_VALUE_COLLECT_FORMAT_MAX_LENGTH (8)
	</pre>
	<p>
	The maximal number of <a class="link" href="gobject-Varargs-Value-Collection.html#GTypeCValue" title="union GTypeCValue"><span class="type">GTypeCValue</span></a>s which can be collected for a
	single <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a>.
	</p>
	</div>
	</div>
	<div class="refsect1" title="See Also">
	<a name="gobject-Varargs-Value-Collection.see-also"></a><h2>See Also</h2>
	<span class="type">GValueTable</span>
	</div>
	</div>
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