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<div class="title">Variable-length Sequence Datatypes<div class="ingroups"><a class="el" href="group___h5_t.html">Datatypes (H5T)</a></div></div> </div>
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Functions</h2></td></tr>
<tr class="memitem:ga6841355fa5b3c924876b121dedb8ed2f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___v_l_e_n.html#ga6841355fa5b3c924876b121dedb8ed2f">H5Tvlen_create</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> base_id)</td></tr>
<tr class="memdesc:ga6841355fa5b3c924876b121dedb8ed2f"><td class="mdescLeft"> </td><td class="mdescRight">Creates a new variable-length array datatype. <a href="group___v_l_e_n.html#ga6841355fa5b3c924876b121dedb8ed2f">More...</a><br /></td></tr>
<tr class="separator:ga6841355fa5b3c924876b121dedb8ed2f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga6851783a68a0f868c27300cb5622fbbe"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___v_l_e_n.html#ga6851783a68a0f868c27300cb5622fbbe">H5Treclaim</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> type_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> space_id, <a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> plist_id, void *buf)</td></tr>
<tr class="memdesc:ga6851783a68a0f868c27300cb5622fbbe"><td class="mdescLeft"> </td><td class="mdescRight">Reclaims the variable length (VL) datatype memory buffers. <a href="group___v_l_e_n.html#ga6851783a68a0f868c27300cb5622fbbe">More...</a><br /></td></tr>
<tr class="separator:ga6851783a68a0f868c27300cb5622fbbe"><td class="memSeparator" colspan="2"> </td></tr>
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<h2 class="groupheader">Function Documentation</h2>
<a id="ga6851783a68a0f868c27300cb5622fbbe"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga6851783a68a0f868c27300cb5622fbbe">◆ </a></span>H5Treclaim()</h2>
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<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Treclaim </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>type_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>space_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>plist_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>buf</em> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>Reclaims the variable length (VL) datatype memory buffers. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">type_id</td><td>Datatype identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">space_id</td><td>Dataspace identifier </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">plist_id</td><td>Dataset transfer property list identifier used to create the buffer </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">buf</td><td>Pointer to the buffer to be reclaimed</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="group___v_l_e_n.html#ga6851783a68a0f868c27300cb5622fbbe" title="Reclaims the variable length (VL) datatype memory buffers.">H5Treclaim()</a> reclaims memory buffers created to store VL datatypes. It only frees the variable length data in the selection defined in the dataspace specified by <code>space_id</code>. The dataset transfer property list <code>plist_id</code> is required to find the correct allocation and/or free methods for the variable-length data in the buffer.</p>
<dl class="section since"><dt>Since</dt><dd>1.12.0 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga6841355fa5b3c924876b121dedb8ed2f">◆ </a></span>H5Tvlen_create()</h2>
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<td class="memname"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> H5Tvlen_create </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>base_id</em></td><td>)</td>
<td></td>
</tr>
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<p>Creates a new variable-length array datatype. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">base_id</td><td>Datatype identifier, the element type of the datatype to create</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a variable-length datatype identifier if successful; otherwise returns <a class="el" href="_h5_ipublic_8h.html#a01eab13dccc91afd6909d74dccb780ba">H5I_INVALID_HID</a>.</dd></dl>
<p><a class="el" href="group___v_l_e_n.html#ga6841355fa5b3c924876b121dedb8ed2f" title="Creates a new variable-length array datatype.">H5Tvlen_create()</a> creates a new one-dimensional array datatype of variable-length (VL) with the base datatype <code>base_id</code>.</p>
<p>This one-dimensional array often represents a data sequence of the base datatype, such as characters for character sequences or vertex coordinates for polygon lists. The base type specified for the VL datatype can be any HDF5 datatype, including another VL datatype, a compound datatype, or an atomic datatype.</p>
<p>When necessary, use <a class="el" href="group___h5_t.html#ga331e8f7b388a50af77294018db788de3" title="Returns the base datatype from which a datatype is derived.">H5Tget_super()</a> to determine the base type of the VL datatype.</p>
<p>The datatype identifier returned from this function should be released with <a class="el" href="group___h5_t.html#gafcba4db244f6a4d71e99c6e72b8678f0" title="Releases a datatype.">H5Tclose()</a> or resource leaks will result. Under certain circumstances, <a class="el" href="group___h5_d.html#ga222a2fd93868e2524b2e42c3c6146119" title="Reclaims variable-length (VL) datatype memory buffers.">H5Dvlen_reclaim()</a> must also be used.</p>
<dl class="section attention"><dt>Attention</dt><dd><a class="el" href="group___v_l_e_n.html#ga6841355fa5b3c924876b121dedb8ed2f" title="Creates a new variable-length array datatype.">H5Tvlen_create()</a> cannot be used to create a variable-length string datatype. <a class="el" href="group___v_l_e_n.html#ga6841355fa5b3c924876b121dedb8ed2f" title="Creates a new variable-length array datatype.">H5Tvlen_create()</a> called with a string or character base type creates a variable-length sequence of strings (a variable-length, 1-dimensional array), with each element of the array being of the string or character base type.<br />
To create a variable-length string datatype, see <em>Creating variable-length string datatypes</em>. </dd></dl>
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