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| <a name="gobject-Varargs-Value-Collection"></a><div class="titlepage"></div> |
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| <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 class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gobject-Varargs-Value-Collection.functions"></a><h2>Functions</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="functions_return"> |
| <col class="functions_name"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"> |
| <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-INIT:CAPS" title="G_VALUE_COLLECT_INIT()">G_VALUE_COLLECT_INIT</a><span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"> |
| <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT:CAPS" title="G_VALUE_COLLECT()">G_VALUE_COLLECT</a><span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"> |
| <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-COLLECT-SKIP:CAPS" title="G_VALUE_COLLECT_SKIP()">G_VALUE_COLLECT_SKIP</a><span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"> |
| <a class="link" href="gobject-Varargs-Value-Collection.html#G-VALUE-LCOPY:CAPS" title="G_VALUE_LCOPY()">G_VALUE_LCOPY</a><span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gobject-Varargs-Value-Collection.other"></a><h2>Types and Values</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="name"> |
| <col class="description"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="datatype_keyword"> </td> |
| <td class="function_name"><a class="link" href="gobject-Varargs-Value-Collection.html#GTypeCValue" title="GTypeCValue">GTypeCValue</a></td> |
| </tr> |
| <tr> |
| <td class="define_keyword">#define</td> |
| <td class="function_name"><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></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gobject-Varargs-Value-Collection.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <glib-object.h> |
| #include <gobject/gvaluecollector.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <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"> |
| <a name="gobject-Varargs-Value-Collection.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <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="refsect3"> |
| <a name="G-VALUE-COLLECT-INIT.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>value</p></td> |
| <td class="parameter_description"><p>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.</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>_value_type</p></td> |
| <td class="parameter_description"><p>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> |
| .</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>var_args</p></td> |
| <td class="parameter_description"><p>the va_list variable; it may be evaluated multiple times</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>flags</p></td> |
| <td class="parameter_description"><p>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="struct GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em> |
| .</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>__error</p></td> |
| <td class="parameter_description"><p>a <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="../glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a> |
| allocated error messages if something fails</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <p class="since">Since: <a class="link" href="api-index-2-24.html#api-index-2.24">2.24</a></p> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <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="refsect3"> |
| <a name="G-VALUE-COLLECT.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>value</p></td> |
| <td class="parameter_description"><p>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</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>var_args</p></td> |
| <td class="parameter_description"><p>the va_list variable; it may be evaluated multiple times</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>flags</p></td> |
| <td class="parameter_description"><p>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="struct GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em> |
| .</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>__error</p></td> |
| <td class="parameter_description"><p>a <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="../glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a> |
| allocated error messages if something fails</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="G-VALUE-COLLECT-SKIP:CAPS"></a><h3>G_VALUE_COLLECT_SKIP()</h3> |
| <pre class="programlisting">#define G_VALUE_COLLECT_SKIP(_value_type, var_args)</pre> |
| <p>Skip an argument of type <em class="parameter"><code>_value_type</code></em> |
| from <em class="parameter"><code>var_args</code></em> |
| .</p> |
| <div class="refsect3"> |
| <a name="G-VALUE-COLLECT-SKIP.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>_value_type</p></td> |
| <td class="parameter_description"><p>the <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> of the value to skip</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>var_args</p></td> |
| <td class="parameter_description"><p>the va_list variable; it may be evaluated multiple times</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <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="refsect3"> |
| <a name="G-VALUE-LCOPY.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>value</p></td> |
| <td class="parameter_description"><p>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</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>var_args</p></td> |
| <td class="parameter_description"><p>the va_list variable; it may be evaluated multiple times</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>flags</p></td> |
| <td class="parameter_description"><p>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="struct GTypeValueTable"><span class="type">GTypeValueTable</span></a> of <em class="parameter"><code>value</code></em> |
| .</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>__error</p></td> |
| <td class="parameter_description"><p>a <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a>** variable that will be modified to hold a <a href="../glib-Memory-Allocation.html#g-new"><code class="function">g_new()</code></a> |
| allocated error messages if something fails</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gobject-Varargs-Value-Collection.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GTypeCValue"></a><h3>GTypeCValue</h3> |
| <p>A union holding one collected value.</p> |
| <div class="refsect3"> |
| <a name="GTypeCValue.members"></a><h4>Members</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="300px" class="union_members_name"> |
| <col class="union_members_description"> |
| <col width="200px" class="union_members_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="union_member_name"><p><a href="../glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GTypeCValue.v-int"></a>v_int</code></em>;</p></td> |
| <td class="union_member_description"><p>the field for holding integer values</p></td> |
| <td class="union_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="union_member_name"><p><a href="../glib-Basic-Types.html#glong"><span class="type">glong</span></a> <em class="structfield"><code><a name="GTypeCValue.v-long"></a>v_long</code></em>;</p></td> |
| <td class="union_member_description"><p>the field for holding long integer values</p></td> |
| <td class="union_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="union_member_name"><p><a href="../glib-Basic-Types.html#gint64"><span class="type">gint64</span></a> <em class="structfield"><code><a name="GTypeCValue.v-int64"></a>v_int64</code></em>;</p></td> |
| <td class="union_member_description"><p>the field for holding 64 bit integer values</p></td> |
| <td class="union_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="union_member_name"><p><a href="../glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> <em class="structfield"><code><a name="GTypeCValue.v-double"></a>v_double</code></em>;</p></td> |
| <td class="union_member_description"><p>the field for holding floating point values</p></td> |
| <td class="union_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="union_member_name"><p><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> <em class="structfield"><code><a name="GTypeCValue.v-pointer"></a>v_pointer</code></em>;</p></td> |
| <td class="union_member_description"><p>the field for holding pointers</p></td> |
| <td class="union_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <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 href="gobject-Varargs-Value-Collection.html#GTypeCValue"><span class="type">GTypeCValues</span></a> 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> |
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