docs/reference/html/gi-GIVFuncInfo.html

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  26 <div class="refentry">
  27 <a name="gi-GIVFuncInfo"></a><div class="titlepage"></div>
  28 <div class="refnamediv"><table width="100%"><tr>
  29 <td valign="top">
  30 <h2><span class="refentrytitle"><a name="gi-GIVFuncInfo.top_of_page"></a>GIVFuncInfo</span></h2>
  31 <p>GIVFuncInfo — Struct representing a virtual function</p>
  32 </td>
  33 <td valign="top" align="right"></td>
  34 </tr></table></div>
  35 <div class="refsynopsisdiv">
  36 <a name="gi-GIVFuncInfo.synopsis"></a><h2>Synopsis</h2>
  37 <pre class="synopsis">typedef             <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo">GIVFuncInfo</a>;
  38 enum                <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfoFlags" title="enum GIVFuncInfoFlags">GIVFuncInfoFlags</a>;
  39 <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfoFlags" title="enum GIVFuncInfoFlags"><span class="returnvalue">GIVFuncInfoFlags</span></a>    <a class="link" href="gi-GIVFuncInfo.html#g-vfunc-info-get-flags" title="g_vfunc_info_get_flags ()">g_vfunc_info_get_flags</a>              (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>);
  40 <span class="returnvalue">gint</span>                <a class="link" href="gi-GIVFuncInfo.html#g-vfunc-info-get-offset" title="g_vfunc_info_get_offset ()">g_vfunc_info_get_offset</a>             (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>);
  41 <a class="link" href="gi-GISignalInfo.html#GISignalInfo" title="GISignalInfo"><span class="returnvalue">GISignalInfo</span></a> *      <a class="link" href="gi-GIVFuncInfo.html#g-vfunc-info-get-signal" title="g_vfunc_info_get_signal ()">g_vfunc_info_get_signal</a>             (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>);
  42 <a class="link" href="gi-GIFunctionInfo.html#GIFunctionInfo" title="GIFunctionInfo"><span class="returnvalue">GIFunctionInfo</span></a> *    <a class="link" href="gi-GIVFuncInfo.html#g-vfunc-info-get-invoker" title="g_vfunc_info_get_invoker ()">g_vfunc_info_get_invoker</a>            (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>);
  43 <span class="returnvalue">gpointer</span>            <a class="link" href="gi-GIVFuncInfo.html#g-vfunc-info-get-address" title="g_vfunc_info_get_address ()">g_vfunc_info_get_address</a>            (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>,
  44                                                          <em class="parameter"><code><span class="type">GType</span> implementor_gtype</code></em>,
  45                                                          <em class="parameter"><code><span class="type">GError</span> **error</code></em>);
  46 <span class="returnvalue">gboolean</span>            <a class="link" href="gi-GIVFuncInfo.html#g-vfunc-info-invoke" title="g_vfunc_info_invoke ()">g_vfunc_info_invoke</a>                 (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>,
  47                                                          <em class="parameter"><code><span class="type">GType</span> implementor</code></em>,
  48                                                          <em class="parameter"><code>const <a class="link" href="gi-common-types.html#GIArgument" title="union GIArgument"><span class="type">GIArgument</span></a> *in_args</code></em>,
  49                                                          <em class="parameter"><code><span class="type">int</span> n_in_args</code></em>,
  50                                                          <em class="parameter"><code>const <a class="link" href="gi-common-types.html#GIArgument" title="union GIArgument"><span class="type">GIArgument</span></a> *out_args</code></em>,
  51                                                          <em class="parameter"><code><span class="type">int</span> n_out_args</code></em>,
  52                                                          <em class="parameter"><code><a class="link" href="gi-common-types.html#GIArgument" title="union GIArgument"><span class="type">GIArgument</span></a> *return_value</code></em>,
  53                                                          <em class="parameter"><code><span class="type">GError</span> **error</code></em>);
  54 </pre>
  55 </div>
  56 <div class="refsect1">
  57 <a name="gi-GIVFuncInfo.description"></a><h2>Description</h2>
  58 <p>
  59 GIVfuncInfo represents a virtual function. A property belongs to
  60 either a <a class="link" href="gi-GIObjectInfo.html#GIObjectInfo" title="GIObjectInfo"><span class="type">GIObjectInfo</span></a> or a <a class="link" href="gi-GIInterfaceInfo.html#GIInterfaceInfo" title="GIInterfaceInfo"><span class="type">GIInterfaceInfo</span></a>.
  61 </p>
  62 <p>
  63 </p>
  64 <div class="refsect1">
  65 <a name="gi-givfuncinfo.struct-hierarchy"></a><h2>Struct hierarchy</h2>
  66 <pre class="synopsis">
  67   <a class="link" href="gi-GIBaseInfo.html" title="GIBaseInfo">GIBaseInfo</a>
  68    +----<a class="link" href="gi-GICallableInfo.html" title="GICallableInfo">GICallableInfo</a>
  69          +----<a class="link" href="gi-GIFunctionInfo.html" title="GIFunctionInfo">GIFunctionInfo</a>
  70          +----<a class="link" href="gi-GISignalInfo.html" title="GISignalInfo">GISignalInfo</a>
  71          +----GIVFuncInfo
  72 </pre>
  73 </div>
  74 <p>
  75 </p>
  76 </div>
  77 <div class="refsect1">
  78 <a name="gi-GIVFuncInfo.details"></a><h2>Details</h2>
  79 <div class="refsect2">
  80 <a name="GIVFuncInfo"></a><h3>GIVFuncInfo</h3>
  81 <pre class="programlisting">typedef GIBaseInfo GIVFuncInfo;
  82 </pre>
  83 <p>
  84 Represents a virtual function.
  85 </p>
  86 </div>
  87 <hr>
  88 <div class="refsect2">
  89 <a name="GIVFuncInfoFlags"></a><h3>enum GIVFuncInfoFlags</h3>
  90 <pre class="programlisting">typedef enum {
  91   GI_VFUNC_MUST_CHAIN_UP     = 1 &lt;&lt; 0,
  92   GI_VFUNC_MUST_OVERRIDE     = 1 &lt;&lt; 1,
  93   GI_VFUNC_MUST_NOT_OVERRIDE = 1 &lt;&lt; 2,
  94   GI_VFUNC_THROWS =            1 &lt;&lt; 3
  95 } GIVFuncInfoFlags;
  96 </pre>
  97 <p>
  98 Flags of a <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> struct.
  99 </p>
 100 <div class="variablelist"><table border="0" class="variablelist">
 101 <colgroup>
 102 <col align="left" valign="top">
 103 <col>
 104 </colgroup>
 105 <tbody>
 106 <tr>
 107 <td><p><a name="GI-VFUNC-MUST-CHAIN-UP:CAPS"></a><span class="term"><code class="literal">GI_VFUNC_MUST_CHAIN_UP</code></span></p></td>
 108 <td>chains up to the parent type
 109 </td>
 110 </tr>
 111 <tr>
 112 <td><p><a name="GI-VFUNC-MUST-OVERRIDE:CAPS"></a><span class="term"><code class="literal">GI_VFUNC_MUST_OVERRIDE</code></span></p></td>
 113 <td>overrides
 114 </td>
 115 </tr>
 116 <tr>
 117 <td><p><a name="GI-VFUNC-MUST-NOT-OVERRIDE:CAPS"></a><span class="term"><code class="literal">GI_VFUNC_MUST_NOT_OVERRIDE</code></span></p></td>
 118 <td>does not override
 119 </td>
 120 </tr>
 121 <tr>
 122 <td><p><a name="GI-VFUNC-THROWS:CAPS"></a><span class="term"><code class="literal">GI_VFUNC_THROWS</code></span></p></td>
 123 <td>Includes a <span class="type">GError</span>
 124 </td>
 125 </tr>
 126 </tbody>
 127 </table></div>
 128 </div>
 129 <hr>
 130 <div class="refsect2">
 131 <a name="g-vfunc-info-get-flags"></a><h3>g_vfunc_info_get_flags ()</h3>
 132 <pre class="programlisting"><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfoFlags" title="enum GIVFuncInfoFlags"><span class="returnvalue">GIVFuncInfoFlags</span></a>    g_vfunc_info_get_flags              (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>);</pre>
 133 <p>
 134 Obtain the flags for this virtual function info. See <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfoFlags" title="enum GIVFuncInfoFlags"><span class="type">GIVFuncInfoFlags</span></a> for
 135 more information about possible flag values.
 136 </p>
 137 <div class="variablelist"><table border="0" class="variablelist">
 138 <colgroup>
 139 <col align="left" valign="top">
 140 <col>
 141 </colgroup>
 142 <tbody>
 143 <tr>
 144 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 145 <td>a <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a>
 146 </td>
 147 </tr>
 148 <tr>
 149 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 150 <td>the flags</td>
 151 </tr>
 152 </tbody>
 153 </table></div>
 154 </div>
 155 <hr>
 156 <div class="refsect2">
 157 <a name="g-vfunc-info-get-offset"></a><h3>g_vfunc_info_get_offset ()</h3>
 158 <pre class="programlisting"><span class="returnvalue">gint</span>                g_vfunc_info_get_offset             (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>);</pre>
 159 <p>
 160 Obtain the offset of the function pointer in the class struct. The value
 161 0xFFFF indicates that the struct offset is unknown.
 162 </p>
 163 <div class="variablelist"><table border="0" class="variablelist">
 164 <colgroup>
 165 <col align="left" valign="top">
 166 <col>
 167 </colgroup>
 168 <tbody>
 169 <tr>
 170 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 171 <td>a <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a>
 172 </td>
 173 </tr>
 174 <tr>
 175 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 176 <td>the struct offset or 0xFFFF if it's unknown</td>
 177 </tr>
 178 </tbody>
 179 </table></div>
 180 </div>
 181 <hr>
 182 <div class="refsect2">
 183 <a name="g-vfunc-info-get-signal"></a><h3>g_vfunc_info_get_signal ()</h3>
 184 <pre class="programlisting"><a class="link" href="gi-GISignalInfo.html#GISignalInfo" title="GISignalInfo"><span class="returnvalue">GISignalInfo</span></a> *      g_vfunc_info_get_signal             (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>);</pre>
 185 <p>
 186 Obtain the signal for the virtual function if one is set.
 187 The signal comes from the object or interface to which
 188 this virtual function belongs.
 189 </p>
 190 <div class="variablelist"><table border="0" class="variablelist">
 191 <colgroup>
 192 <col align="left" valign="top">
 193 <col>
 194 </colgroup>
 195 <tbody>
 196 <tr>
 197 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 198 <td>a <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a>
 199 </td>
 200 </tr>
 201 <tr>
 202 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 203 <td>the signal or <code class="literal">NULL</code> if none set. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
 204 </td>
 205 </tr>
 206 </tbody>
 207 </table></div>
 208 </div>
 209 <hr>
 210 <div class="refsect2">
 211 <a name="g-vfunc-info-get-invoker"></a><h3>g_vfunc_info_get_invoker ()</h3>
 212 <pre class="programlisting"><a class="link" href="gi-GIFunctionInfo.html#GIFunctionInfo" title="GIFunctionInfo"><span class="returnvalue">GIFunctionInfo</span></a> *    g_vfunc_info_get_invoker            (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>);</pre>
 213 <p>
 214 If this virtual function has an associated invoker method, this
 215 method will return it.  An invoker method is a C entry point.
 216 </p>
 217 <p>
 218 Not all virtuals will have invokers.
 219 </p>
 220 <div class="variablelist"><table border="0" class="variablelist">
 221 <colgroup>
 222 <col align="left" valign="top">
 223 <col>
 224 </colgroup>
 225 <tbody>
 226 <tr>
 227 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 228 <td>a <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a>
 229 </td>
 230 </tr>
 231 <tr>
 232 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 233 <td>the <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> or <code class="literal">NULL</code>. Free it with
 234 <a class="link" href="gi-GIBaseInfo.html#g-base-info-unref" title="g_base_info_unref ()"><code class="function">g_base_info_unref()</code></a> when done. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
 235 </td>
 236 </tr>
 237 </tbody>
 238 </table></div>
 239 </div>
 240 <hr>
 241 <div class="refsect2">
 242 <a name="g-vfunc-info-get-address"></a><h3>g_vfunc_info_get_address ()</h3>
 243 <pre class="programlisting"><span class="returnvalue">gpointer</span>            g_vfunc_info_get_address            (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>,
 244                                                          <em class="parameter"><code><span class="type">GType</span> implementor_gtype</code></em>,
 245                                                          <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
 246 <p>
 247 This method will look up where inside the type struct of <em class="parameter"><code>implementor_gtype</code></em>
 248 is the implementation for <em class="parameter"><code>info</code></em>.
 249 </p>
 250 <div class="variablelist"><table border="0" class="variablelist">
 251 <colgroup>
 252 <col align="left" valign="top">
 253 <col>
 254 </colgroup>
 255 <tbody>
 256 <tr>
 257 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 258 <td>a <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a>
 259 </td>
 260 </tr>
 261 <tr>
 262 <td><p><span class="term"><em class="parameter"><code>implementor_gtype</code></em> :</span></p></td>
 263 <td>
 264 <span class="type">GType</span> implementing this virtual function</td>
 265 </tr>
 266 <tr>
 267 <td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
 268 <td>return location for a <span class="type">GError</span>
 269 </td>
 270 </tr>
 271 <tr>
 272 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 273 <td>address to a function or <code class="literal">NULL</code> if an error happened</td>
 274 </tr>
 275 </tbody>
 276 </table></div>
 277 </div>
 278 <hr>
 279 <div class="refsect2">
 280 <a name="g-vfunc-info-invoke"></a><h3>g_vfunc_info_invoke ()</h3>
 281 <pre class="programlisting"><span class="returnvalue">gboolean</span>            g_vfunc_info_invoke                 (<em class="parameter"><code><a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> *info</code></em>,
 282                                                          <em class="parameter"><code><span class="type">GType</span> implementor</code></em>,
 283                                                          <em class="parameter"><code>const <a class="link" href="gi-common-types.html#GIArgument" title="union GIArgument"><span class="type">GIArgument</span></a> *in_args</code></em>,
 284                                                          <em class="parameter"><code><span class="type">int</span> n_in_args</code></em>,
 285                                                          <em class="parameter"><code>const <a class="link" href="gi-common-types.html#GIArgument" title="union GIArgument"><span class="type">GIArgument</span></a> *out_args</code></em>,
 286                                                          <em class="parameter"><code><span class="type">int</span> n_out_args</code></em>,
 287                                                          <em class="parameter"><code><a class="link" href="gi-common-types.html#GIArgument" title="union GIArgument"><span class="type">GIArgument</span></a> *return_value</code></em>,
 288                                                          <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
 289 <p>
 290 Invokes the function described in <em class="parameter"><code>info</code></em> with the given
 291 arguments. Note that inout parameters must appear in both
 292 argument lists.
 293 </p>
 294 <div class="variablelist"><table border="0" class="variablelist">
 295 <colgroup>
 296 <col align="left" valign="top">
 297 <col>
 298 </colgroup>
 299 <tbody>
 300 <tr>
 301 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 302 <td>a <a class="link" href="gi-GIVFuncInfo.html#GIVFuncInfo" title="GIVFuncInfo"><span class="type">GIVFuncInfo</span></a> describing the virtual function to invoke</td>
 303 </tr>
 304 <tr>
 305 <td><p><span class="term"><em class="parameter"><code>implementor</code></em> :</span></p></td>
 306 <td>
 307 <span class="type">GType</span> of the type that implements this virtual function</td>
 308 </tr>
 309 <tr>
 310 <td><p><span class="term"><em class="parameter"><code>in_args</code></em> :</span></p></td>
 311 <td>an array of <a class="link" href="gi-common-types.html#GIArgument" title="union GIArgument"><span class="type">GIArgument</span></a>s, one for each in
 312 parameter of <em class="parameter"><code>info</code></em>. If there are no in parameter, <em class="parameter"><code>in_args</code></em>
 313 can be <code class="literal">NULL</code>
 314 </td>
 315 </tr>
 316 <tr>
 317 <td><p><span class="term"><em class="parameter"><code>n_in_args</code></em> :</span></p></td>
 318 <td>the length of the <em class="parameter"><code>in_args</code></em> array</td>
 319 </tr>
 320 <tr>
 321 <td><p><span class="term"><em class="parameter"><code>out_args</code></em> :</span></p></td>
 322 <td>an array of <a class="link" href="gi-common-types.html#GIArgument" title="union GIArgument"><span class="type">GIArgument</span></a>s, one for each out
 323 parameter of <em class="parameter"><code>info</code></em>. If there are no out parameters, <em class="parameter"><code>out_args</code></em>
 324 may be <code class="literal">NULL</code>
 325 </td>
 326 </tr>
 327 <tr>
 328 <td><p><span class="term"><em class="parameter"><code>n_out_args</code></em> :</span></p></td>
 329 <td>the length of the <em class="parameter"><code>out_args</code></em> array</td>
 330 </tr>
 331 <tr>
 332 <td><p><span class="term"><em class="parameter"><code>return_value</code></em> :</span></p></td>
 333 <td>return location for the return value of the
 334 function. If the function returns void, <em class="parameter"><code>return_value</code></em> may be
 335 <code class="literal">NULL</code>
 336 </td>
 337 </tr>
 338 <tr>
 339 <td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
 340 <td>return location for detailed error information, or <code class="literal">NULL</code>
 341 </td>
 342 </tr>
 343 <tr>
 344 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 345 <td>
 346 <code class="literal">TRUE</code> if the function has been invoked, <code class="literal">FALSE</code> if an
 347 error occurred.</td>
 348 </tr>
 349 </tbody>
 350 </table></div>
 351 </div>
 352 </div>
 353 </div>
 354 <div class="footer">
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