docs/reference/html/gi-GITypeInfo.html

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  24 <a href="#gi-GITypeInfo.synopsis" class="shortcut">Top</a>
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  26                   <a href="#gi-GITypeInfo.description" class="shortcut">Description</a>
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  29 <div class="refentry">
  30 <a name="gi-GITypeInfo"></a><div class="titlepage"></div>
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  32 <td valign="top">
  33 <h2><span class="refentrytitle"><a name="gi-GITypeInfo.top_of_page"></a>GITypeInfo</span></h2>
  34 <p>GITypeInfo — Struct representing a type</p>
  35 </td>
  36 <td valign="top" align="right"></td>
  37 </tr></table></div>
  38 <div class="refsynopsisdiv">
  39 <a name="gi-GITypeInfo.synopsis"></a><h2>Synopsis</h2>
  40 <pre class="synopsis">#define             <a class="link" href="gi-GITypeInfo.html#GI-IS-TYPE-INFO:CAPS" title="GI_IS_TYPE_INFO()">GI_IS_TYPE_INFO</a>                     (info)
  41 typedef             <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo">GITypeInfo</a>;
  42 const <span class="returnvalue">gchar</span> *       <a class="link" href="gi-GITypeInfo.html#g-type-tag-to-string" title="g_type_tag_to_string ()">g_type_tag_to_string</a>                (<em class="parameter"><code><a class="link" href="gi-common-types.html#GITypeTag" title="enum GITypeTag"><span class="type">GITypeTag</span></a> type</code></em>);
  43 const <span class="returnvalue">gchar</span> *       <a class="link" href="gi-GITypeInfo.html#g-info-type-to-string" title="g_info_type_to_string ()">g_info_type_to_string</a>               (<em class="parameter"><code><a class="link" href="gi-GIBaseInfo.html#GIInfoType" title="enum GIInfoType"><span class="type">GIInfoType</span></a> type</code></em>);
  44 <span class="returnvalue">gboolean</span>            <a class="link" href="gi-GITypeInfo.html#g-type-info-is-pointer" title="g_type_info_is_pointer ()">g_type_info_is_pointer</a>              (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);
  45 <a class="link" href="gi-common-types.html#GITypeTag" title="enum GITypeTag"><span class="returnvalue">GITypeTag</span></a>           <a class="link" href="gi-GITypeInfo.html#g-type-info-get-tag" title="g_type_info_get_tag ()">g_type_info_get_tag</a>                 (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);
  46 <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="returnvalue">GITypeInfo</span></a> *        <a class="link" href="gi-GITypeInfo.html#g-type-info-get-param-type" title="g_type_info_get_param_type ()">g_type_info_get_param_type</a>          (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>,
  47                                                          <em class="parameter"><code><span class="type">gint</span> n</code></em>);
  48 <span class="returnvalue">GIBaseInfo</span> *        <a class="link" href="gi-GITypeInfo.html#g-type-info-get-interface" title="g_type_info_get_interface ()">g_type_info_get_interface</a>           (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);
  49 <span class="returnvalue">gint</span>                <a class="link" href="gi-GITypeInfo.html#g-type-info-get-array-length" title="g_type_info_get_array_length ()">g_type_info_get_array_length</a>        (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);
  50 <span class="returnvalue">gint</span>                <a class="link" href="gi-GITypeInfo.html#g-type-info-get-array-fixed-size" title="g_type_info_get_array_fixed_size ()">g_type_info_get_array_fixed_size</a>    (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);
  51 <span class="returnvalue">gboolean</span>            <a class="link" href="gi-GITypeInfo.html#g-type-info-is-zero-terminated" title="g_type_info_is_zero_terminated ()">g_type_info_is_zero_terminated</a>      (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);
  52 <a class="link" href="gi-common-types.html#GIArrayType" title="enum GIArrayType"><span class="returnvalue">GIArrayType</span></a>         <a class="link" href="gi-GITypeInfo.html#g-type-info-get-array-type" title="g_type_info_get_array_type ()">g_type_info_get_array_type</a>          (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);
  53 </pre>
  54 </div>
  55 <div class="refsect1">
  56 <a name="gi-GITypeInfo.description"></a><h2>Description</h2>
  57 <p>
  58 GITypeInfo represents a type. You can retrieve a type info from
  59 an argument (see <a class="link" href="gi-GIArgInfo.html#GIArgInfo" title="GIArgInfo"><span class="type">GIArgInfo</span></a>), a functions return value (see <a class="link" href="gi-GIFunctionInfo.html#GIFunctionInfo" title="GIFunctionInfo"><span class="type">GIFunctionInfo</span></a>),
  60 a field (see <a class="link" href="gi-GIFieldInfo.html#GIFieldInfo" title="GIFieldInfo"><span class="type">GIFieldInfo</span></a>), a property (see <a class="link" href="gi-GIPropertyInfo.html#GIPropertyInfo" title="GIPropertyInfo"><span class="type">GIPropertyInfo</span></a>), a constant
  61 (see <a class="link" href="gi-GIConstantInfo.html#GIConstantInfo" title="GIConstantInfo"><span class="type">GIConstantInfo</span></a>) or for a union discriminator (see <a class="link" href="gi-GIUnionInfo.html#GIUnionInfo" title="GIUnionInfo"><span class="type">GIUnionInfo</span></a>).
  62 </p>
  63 <p>
  64 A type can either be a of a basic type which is a standard C primitive
  65 type or an interface type. For interface types you need to call
  66 <a class="link" href="gi-GITypeInfo.html#g-type-info-get-interface" title="g_type_info_get_interface ()"><code class="function">g_type_info_get_interface()</code></a> to get a reference to the base info for that
  67 interface.
  68 </p>
  69 <p>
  70 </p>
  71 <div class="refsect1">
  72 <a name="gi-gitypeinfo.struct-hierarchy"></a><h2>Struct hierarchy</h2>
  73 <pre class="synopsis">
  74   <a class="link" href="gi-GIBaseInfo.html" title="GIBaseInfo">GIBaseInfo</a>
  75    +----GITypeInfo
  76 </pre>
  77 </div>
  78 <p>
  79 </p>
  80 </div>
  81 <div class="refsect1">
  82 <a name="gi-GITypeInfo.details"></a><h2>Details</h2>
  83 <div class="refsect2">
  84 <a name="GI-IS-TYPE-INFO:CAPS"></a><h3>GI_IS_TYPE_INFO()</h3>
  85 <pre class="programlisting">#define             GI_IS_TYPE_INFO(info)</pre>
  86 <p>
  87 Checks if <em class="parameter"><code>info</code></em> is a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>.
  88 </p>
  89 <div class="variablelist"><table border="0" class="variablelist">
  90 <colgroup>
  91 <col align="left" valign="top">
  92 <col>
  93 </colgroup>
  94 <tbody><tr>
  95 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
  96 <td>an info structure</td>
  97 </tr></tbody>
  98 </table></div>
  99 </div>
 100 <hr>
 101 <div class="refsect2">
 102 <a name="GITypeInfo"></a><h3>GITypeInfo</h3>
 103 <pre class="programlisting">typedef GIBaseInfo GITypeInfo;
 104 </pre>
 105 <p>
 106 Represents type information, direction, transfer etc.
 107 </p>
 108 </div>
 109 <hr>
 110 <div class="refsect2">
 111 <a name="g-type-tag-to-string"></a><h3>g_type_tag_to_string ()</h3>
 112 <pre class="programlisting">const <span class="returnvalue">gchar</span> *       g_type_tag_to_string                (<em class="parameter"><code><a class="link" href="gi-common-types.html#GITypeTag" title="enum GITypeTag"><span class="type">GITypeTag</span></a> type</code></em>);</pre>
 113 <p>
 114 Obtain a string representation of <em class="parameter"><code>type</code></em>
 115 </p>
 116 <div class="variablelist"><table border="0" class="variablelist">
 117 <colgroup>
 118 <col align="left" valign="top">
 119 <col>
 120 </colgroup>
 121 <tbody>
 122 <tr>
 123 <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
 124 <td>the type_tag</td>
 125 </tr>
 126 <tr>
 127 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 128 <td>the string</td>
 129 </tr>
 130 </tbody>
 131 </table></div>
 132 </div>
 133 <hr>
 134 <div class="refsect2">
 135 <a name="g-info-type-to-string"></a><h3>g_info_type_to_string ()</h3>
 136 <pre class="programlisting">const <span class="returnvalue">gchar</span> *       g_info_type_to_string               (<em class="parameter"><code><a class="link" href="gi-GIBaseInfo.html#GIInfoType" title="enum GIInfoType"><span class="type">GIInfoType</span></a> type</code></em>);</pre>
 137 <p>
 138 Obtain a string representation of <em class="parameter"><code>type</code></em>
 139 </p>
 140 <div class="variablelist"><table border="0" class="variablelist">
 141 <colgroup>
 142 <col align="left" valign="top">
 143 <col>
 144 </colgroup>
 145 <tbody>
 146 <tr>
 147 <td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
 148 <td>the info type</td>
 149 </tr>
 150 <tr>
 151 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 152 <td>the string</td>
 153 </tr>
 154 </tbody>
 155 </table></div>
 156 </div>
 157 <hr>
 158 <div class="refsect2">
 159 <a name="g-type-info-is-pointer"></a><h3>g_type_info_is_pointer ()</h3>
 160 <pre class="programlisting"><span class="returnvalue">gboolean</span>            g_type_info_is_pointer              (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);</pre>
 161 <p>
 162 Obtain if the type is passed as a reference.
 163 </p>
 164 <p>
 165 Note that the types of <a class="link" href="gi-GIArgInfo.html#GI-DIRECTION-OUT:CAPS"><code class="literal">GI_DIRECTION_OUT</code></a> and <a class="link" href="gi-GIArgInfo.html#GI-DIRECTION-INOUT:CAPS"><code class="literal">GI_DIRECTION_INOUT</code></a> parameters
 166 will only be pointers if the underlying type being transferred is a pointer
 167 (i.e. only if the type of the C function’s formal parameter is a pointer to a
 168 pointer).
 169 </p>
 170 <div class="variablelist"><table border="0" class="variablelist">
 171 <colgroup>
 172 <col align="left" valign="top">
 173 <col>
 174 </colgroup>
 175 <tbody>
 176 <tr>
 177 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 178 <td>a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>
 179 </td>
 180 </tr>
 181 <tr>
 182 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 183 <td>
 184 <code class="literal">TRUE</code> if it is a pointer</td>
 185 </tr>
 186 </tbody>
 187 </table></div>
 188 </div>
 189 <hr>
 190 <div class="refsect2">
 191 <a name="g-type-info-get-tag"></a><h3>g_type_info_get_tag ()</h3>
 192 <pre class="programlisting"><a class="link" href="gi-common-types.html#GITypeTag" title="enum GITypeTag"><span class="returnvalue">GITypeTag</span></a>           g_type_info_get_tag                 (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);</pre>
 193 <p>
 194 Obtain the type tag for the type. See <a class="link" href="gi-common-types.html#GITypeTag" title="enum GITypeTag"><span class="type">GITypeTag</span></a> for a list
 195 of type tags.
 196 </p>
 197 <div class="variablelist"><table border="0" class="variablelist">
 198 <colgroup>
 199 <col align="left" valign="top">
 200 <col>
 201 </colgroup>
 202 <tbody>
 203 <tr>
 204 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 205 <td>a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>
 206 </td>
 207 </tr>
 208 <tr>
 209 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 210 <td>the type tag</td>
 211 </tr>
 212 </tbody>
 213 </table></div>
 214 </div>
 215 <hr>
 216 <div class="refsect2">
 217 <a name="g-type-info-get-param-type"></a><h3>g_type_info_get_param_type ()</h3>
 218 <pre class="programlisting"><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="returnvalue">GITypeInfo</span></a> *        g_type_info_get_param_type          (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>,
 219                                                          <em class="parameter"><code><span class="type">gint</span> n</code></em>);</pre>
 220 <p>
 221 Obtain the parameter type <em class="parameter"><code>n</code></em>.
 222 </p>
 223 <div class="variablelist"><table border="0" class="variablelist">
 224 <colgroup>
 225 <col align="left" valign="top">
 226 <col>
 227 </colgroup>
 228 <tbody>
 229 <tr>
 230 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 231 <td>a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>
 232 </td>
 233 </tr>
 234 <tr>
 235 <td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
 236 <td>index of the parameter</td>
 237 </tr>
 238 <tr>
 239 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 240 <td>the param type info. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
 241 </td>
 242 </tr>
 243 </tbody>
 244 </table></div>
 245 </div>
 246 <hr>
 247 <div class="refsect2">
 248 <a name="g-type-info-get-interface"></a><h3>g_type_info_get_interface ()</h3>
 249 <pre class="programlisting"><span class="returnvalue">GIBaseInfo</span> *        g_type_info_get_interface           (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);</pre>
 250 <p>
 251 For types which have <a class="link" href="gi-common-types.html#GI-TYPE-TAG-INTERFACE:CAPS"><span class="type">GI_TYPE_TAG_INTERFACE</span></a> such as GObjects and boxed values,
 252 this function returns full information about the referenced type.  You can then
 253 inspect the type of the returned <span class="type">GIBaseInfo</span> to further query whether it is
 254 a concrete GObject, a GInterface, a structure, etc. using <a class="link" href="gi-GIBaseInfo.html#g-base-info-get-type" title="g_base_info_get_type ()"><code class="function">g_base_info_get_type()</code></a>.
 255 </p>
 256 <div class="variablelist"><table border="0" class="variablelist">
 257 <colgroup>
 258 <col align="left" valign="top">
 259 <col>
 260 </colgroup>
 261 <tbody>
 262 <tr>
 263 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 264 <td>a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>
 265 </td>
 266 </tr>
 267 <tr>
 268 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 269 <td>the <span class="type">GIBaseInfo</span>, or <code class="literal">NULL</code>. Free it with
 270 <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>
 271 </td>
 272 </tr>
 273 </tbody>
 274 </table></div>
 275 </div>
 276 <hr>
 277 <div class="refsect2">
 278 <a name="g-type-info-get-array-length"></a><h3>g_type_info_get_array_length ()</h3>
 279 <pre class="programlisting"><span class="returnvalue">gint</span>                g_type_info_get_array_length        (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);</pre>
 280 <p>
 281 Obtain the array length of the type. The type tag must be a
 282 <a class="link" href="gi-common-types.html#GI-TYPE-TAG-ARRAY:CAPS"><span class="type">GI_TYPE_TAG_ARRAY</span></a> or -1 will returned.
 283 </p>
 284 <div class="variablelist"><table border="0" class="variablelist">
 285 <colgroup>
 286 <col align="left" valign="top">
 287 <col>
 288 </colgroup>
 289 <tbody>
 290 <tr>
 291 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 292 <td>a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>
 293 </td>
 294 </tr>
 295 <tr>
 296 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 297 <td>the array length, or -1 if the type is not an array</td>
 298 </tr>
 299 </tbody>
 300 </table></div>
 301 </div>
 302 <hr>
 303 <div class="refsect2">
 304 <a name="g-type-info-get-array-fixed-size"></a><h3>g_type_info_get_array_fixed_size ()</h3>
 305 <pre class="programlisting"><span class="returnvalue">gint</span>                g_type_info_get_array_fixed_size    (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);</pre>
 306 <p>
 307 Obtain the fixed array size of the type. The type tag must be a
 308 <a class="link" href="gi-common-types.html#GI-TYPE-TAG-ARRAY:CAPS"><span class="type">GI_TYPE_TAG_ARRAY</span></a> or -1 will returned.
 309 </p>
 310 <div class="variablelist"><table border="0" class="variablelist">
 311 <colgroup>
 312 <col align="left" valign="top">
 313 <col>
 314 </colgroup>
 315 <tbody>
 316 <tr>
 317 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 318 <td>a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>
 319 </td>
 320 </tr>
 321 <tr>
 322 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 323 <td>the size or -1 if it's not an array</td>
 324 </tr>
 325 </tbody>
 326 </table></div>
 327 </div>
 328 <hr>
 329 <div class="refsect2">
 330 <a name="g-type-info-is-zero-terminated"></a><h3>g_type_info_is_zero_terminated ()</h3>
 331 <pre class="programlisting"><span class="returnvalue">gboolean</span>            g_type_info_is_zero_terminated      (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);</pre>
 332 <p>
 333 Obtain if the last element of the array is <code class="literal">NULL</code>. The type tag must be a
 334 <a class="link" href="gi-common-types.html#GI-TYPE-TAG-ARRAY:CAPS"><span class="type">GI_TYPE_TAG_ARRAY</span></a> or <code class="literal">FALSE</code> will returned.
 335 </p>
 336 <div class="variablelist"><table border="0" class="variablelist">
 337 <colgroup>
 338 <col align="left" valign="top">
 339 <col>
 340 </colgroup>
 341 <tbody>
 342 <tr>
 343 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 344 <td>a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>
 345 </td>
 346 </tr>
 347 <tr>
 348 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 349 <td>
 350 <code class="literal">TRUE</code> if zero terminated</td>
 351 </tr>
 352 </tbody>
 353 </table></div>
 354 </div>
 355 <hr>
 356 <div class="refsect2">
 357 <a name="g-type-info-get-array-type"></a><h3>g_type_info_get_array_type ()</h3>
 358 <pre class="programlisting"><a class="link" href="gi-common-types.html#GIArrayType" title="enum GIArrayType"><span class="returnvalue">GIArrayType</span></a>         g_type_info_get_array_type          (<em class="parameter"><code><a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a> *info</code></em>);</pre>
 359 <p>
 360 Obtain the array type for this type. See <a class="link" href="gi-common-types.html#GIArrayType" title="enum GIArrayType"><span class="type">GIArrayType</span></a> for a list of
 361 possible values. If the type tag of this type is not array, -1 will be
 362 returned.
 363 </p>
 364 <div class="variablelist"><table border="0" class="variablelist">
 365 <colgroup>
 366 <col align="left" valign="top">
 367 <col>
 368 </colgroup>
 369 <tbody>
 370 <tr>
 371 <td><p><span class="term"><em class="parameter"><code>info</code></em> :</span></p></td>
 372 <td>a <a class="link" href="gi-GITypeInfo.html#GITypeInfo" title="GITypeInfo"><span class="type">GITypeInfo</span></a>
 373 </td>
 374 </tr>
 375 <tr>
 376 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 377 <td>the array type or -1</td>
 378 </tr>
 379 </tbody>
 380 </table></div>
 381 </div>
 382 </div>
 383 </div>
 384 <div class="footer">
 385 <hr>
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