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<div class="title">Tango::DbDatum Class Reference<div class="ingroups"><a class="el" href="group__Client.html">Client classes</a> » <a class="el" href="group__DBase.html">Database Client classes</a></div></div> </div>
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<p>A database value.
<a href="classTango_1_1DbDatum.html#details">More...</a></p>
<p><code>#include "tango.h"</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td colspan="2"><div class="groupHeader">Constructors</div></td></tr>
<tr class="memitem:aeff53e61f2fa3a42ac930113af6b9f0c"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#aeff53e61f2fa3a42ac930113af6b9f0c">DbDatum</a> (string name)</td></tr>
<tr class="memdesc:aeff53e61f2fa3a42ac930113af6b9f0c"><td class="mdescLeft"> </td><td class="mdescRight">Create a <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> object. <a href="#aeff53e61f2fa3a42ac930113af6b9f0c">More...</a><br /></td></tr>
<tr class="separator:aeff53e61f2fa3a42ac930113af6b9f0c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af66b0aadb93b23168cb56d81d61baf48"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#af66b0aadb93b23168cb56d81d61baf48">DbDatum</a> (const char *name)</td></tr>
<tr class="memdesc:af66b0aadb93b23168cb56d81d61baf48"><td class="mdescLeft"> </td><td class="mdescRight">Create a <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> object. <a href="#af66b0aadb93b23168cb56d81d61baf48">More...</a><br /></td></tr>
<tr class="separator:af66b0aadb93b23168cb56d81d61baf48"><td class="memSeparator" colspan="2"> </td></tr>
<tr><td colspan="2"><div class="groupHeader">Operators overloading</div></td></tr>
<tr class="memitem:a66304a562149bdb6d89858cbca65729e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#a66304a562149bdb6d89858cbca65729e">operator<<</a> (bool val)</td></tr>
<tr class="memdesc:a66304a562149bdb6d89858cbca65729e"><td class="mdescLeft"> </td><td class="mdescRight">Inserters operators. <a href="#a66304a562149bdb6d89858cbca65729e">More...</a><br /></td></tr>
<tr class="separator:a66304a562149bdb6d89858cbca65729e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:afd6ed9a2e6b129bcc9ae26e16ae4ef0b"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#afd6ed9a2e6b129bcc9ae26e16ae4ef0b">operator>></a> (bool &val)</td></tr>
<tr class="memdesc:afd6ed9a2e6b129bcc9ae26e16ae4ef0b"><td class="mdescLeft"> </td><td class="mdescRight">Extractors operators. <a href="#afd6ed9a2e6b129bcc9ae26e16ae4ef0b">More...</a><br /></td></tr>
<tr class="separator:afd6ed9a2e6b129bcc9ae26e16ae4ef0b"><td class="memSeparator" colspan="2"> </td></tr>
<tr><td colspan="2"><div class="groupHeader">Exception related methods methods</div></td></tr>
<tr class="memitem:adce60a23dccf7f08f1fc7f81cbc783f0"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#adce60a23dccf7f08f1fc7f81cbc783f0">exceptions</a> (bitset< DbDatum::numFlags > fl)</td></tr>
<tr class="memdesc:adce60a23dccf7f08f1fc7f81cbc783f0"><td class="mdescLeft"> </td><td class="mdescRight">Set exception flag. <a href="#adce60a23dccf7f08f1fc7f81cbc783f0">More...</a><br /></td></tr>
<tr class="separator:adce60a23dccf7f08f1fc7f81cbc783f0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a332a7e23267e200c786a5b8486916205"><td class="memItemLeft" align="right" valign="top">bitset< DbDatum::numFlags > </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#a332a7e23267e200c786a5b8486916205">exceptions</a> ()</td></tr>
<tr class="memdesc:a332a7e23267e200c786a5b8486916205"><td class="mdescLeft"> </td><td class="mdescRight">Get exception flag. <a href="#a332a7e23267e200c786a5b8486916205">More...</a><br /></td></tr>
<tr class="separator:a332a7e23267e200c786a5b8486916205"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6c4f542a1f33e2ff5e7f2e16aded5679"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#a6c4f542a1f33e2ff5e7f2e16aded5679">reset_exceptions</a> (except_flags fl)</td></tr>
<tr class="memdesc:a6c4f542a1f33e2ff5e7f2e16aded5679"><td class="mdescLeft"> </td><td class="mdescRight">Reset one exception flag. <a href="#a6c4f542a1f33e2ff5e7f2e16aded5679">More...</a><br /></td></tr>
<tr class="separator:a6c4f542a1f33e2ff5e7f2e16aded5679"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aff8fbe5d2dd3c816b1ff24c55fb1295a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#aff8fbe5d2dd3c816b1ff24c55fb1295a">set_exceptions</a> (except_flags fl)</td></tr>
<tr class="memdesc:aff8fbe5d2dd3c816b1ff24c55fb1295a"><td class="mdescLeft"> </td><td class="mdescRight">Set one exception flag. <a href="#aff8fbe5d2dd3c816b1ff24c55fb1295a">More...</a><br /></td></tr>
<tr class="separator:aff8fbe5d2dd3c816b1ff24c55fb1295a"><td class="memSeparator" colspan="2"> </td></tr>
<tr><td colspan="2"><div class="groupHeader">Miscellaneous methods</div></td></tr>
<tr class="memitem:aead8e1ceb14215958af0c4202d973e54"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classTango_1_1DbDatum.html#aead8e1ceb14215958af0c4202d973e54">is_empty</a> ()</td></tr>
<tr class="memdesc:aead8e1ceb14215958af0c4202d973e54"><td class="mdescLeft"> </td><td class="mdescRight">Test if instance is empty. <a href="#aead8e1ceb14215958af0c4202d973e54">More...</a><br /></td></tr>
<tr class="separator:aead8e1ceb14215958af0c4202d973e54"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A database value. </p>
<p>A single database value which has a name, type, address and value and methods for inserting and extracting C++ native types. This is the fundamental type for specifying database properties. Every property has a name and has one or more values associated with it. The values can be inserted and extracted using the operators << and >> respectively. A status flag indicates if there is data in the <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> object or not. An additional flag allows the user to activate exceptions. </p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
<a id="aeff53e61f2fa3a42ac930113af6b9f0c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aeff53e61f2fa3a42ac930113af6b9f0c">◆ </a></span>DbDatum() <span class="overload">[1/2]</span></h2>
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<td class="memname">Tango::DbDatum::DbDatum </td>
<td>(</td>
<td class="paramtype">string </td>
<td class="paramname"><em>name</em></td><td>)</td>
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<p>Create a <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> object. </p>
<p>Create an instance of the <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> class with name set to the specified parameter</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">name</td><td>The CORBA ORB pointer. Default value is fine for 99 % of cases </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#af66b0aadb93b23168cb56d81d61baf48">◆ </a></span>DbDatum() <span class="overload">[2/2]</span></h2>
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<td class="memname">Tango::DbDatum::DbDatum </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>name</em></td><td>)</td>
<td></td>
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<p>Create a <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> object. </p>
<p>Create an instance of the <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> class with name set to the specified parameter</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">name</td><td>The CORBA ORB pointer. Default value is fine for 99 % of cases </td></tr>
</table>
</dd>
</dl>
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</div>
<h2 class="groupheader">Member Function Documentation</h2>
<a id="a332a7e23267e200c786a5b8486916205"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a332a7e23267e200c786a5b8486916205">◆ </a></span>exceptions() <span class="overload">[1/2]</span></h2>
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<td class="memname">bitset<DbDatum::numFlags> Tango::DbDatum::exceptions </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<p>Get exception flag. </p>
<p>Returns the whole exception flags. The following is an example of how to use these exceptions related methods </p><div class="fragment"><div class="line"><a class="code" href="classTango_1_1DbDatum.html#aeff53e61f2fa3a42ac930113af6b9f0c">DbDatum</a> da;</div><div class="line"> </div><div class="line">bitset<DbDatum::numFlags> bs = da.exceptions();</div><div class="line">cout << <span class="stringliteral">"bs = "</span> << bs << endl;</div><div class="line"> </div><div class="line">da.set_exceptions(DbDatum::wrongtype_flag);</div><div class="line">bs = da.exceptions();</div><div class="line"> </div><div class="line">cout << <span class="stringliteral">"bs = "</span> << bs << endl;</div></div><!-- fragment --><dl class="section return"><dt>Returns</dt><dd>The exception flag </dd></dl>
</div>
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<a id="adce60a23dccf7f08f1fc7f81cbc783f0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#adce60a23dccf7f08f1fc7f81cbc783f0">◆ </a></span>exceptions() <span class="overload">[2/2]</span></h2>
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<td class="memname">void Tango::DbDatum::exceptions </td>
<td>(</td>
<td class="paramtype">bitset< DbDatum::numFlags > </td>
<td class="paramname"><em>fl</em></td><td>)</td>
<td></td>
</tr>
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<span class="mlabels"><span class="mlabel">inline</span></span> </td>
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<p>Set exception flag. </p>
<p>Is a method which allows the user to switch on/off exception throwing for trying to extract data from an empty <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> object. The default is to not throw exception. The following flags are supported : </p><ul>
<li><b>isempty_flag</b> - throw a WrongData exception (reason = API_EmptyDbDatum) if user tries to extract data from an empty <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> object </li>
<li><b>wrongtype_flag</b> - throw a WrongData exception (reason = API_IncompatibleArgumentType) if user tries to extract data with a type different than the type used for insertion</li>
</ul>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">fl</td><td>The exception flag </td></tr>
</table>
</dd>
</dl>
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<a id="aead8e1ceb14215958af0c4202d973e54"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aead8e1ceb14215958af0c4202d973e54">◆ </a></span>is_empty()</h2>
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<td class="memname">bool Tango::DbDatum::is_empty </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<p>Test if instance is empty. </p>
<p><a class="el" href="classTango_1_1DbDatum.html#aead8e1ceb14215958af0c4202d973e54" title="Test if instance is empty.">is_empty()</a> is a boolean method which returns true or false depending on whether the <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> object contains data or not. It can be used to test whether a property is defined in the database or not e.g. </p><div class="fragment"><div class="line">sl_props.push_back(parity_prop);</div><div class="line">dbase->get_device_property(device_name, sl_props);</div><div class="line"> </div><div class="line"><span class="keywordflow">if</span> (! parity_prop.is_empty())</div><div class="line">{</div><div class="line"> parity_prop >> parity;</div><div class="line">}</div><div class="line"><span class="keywordflow">else</span></div><div class="line">{</div><div class="line"> cout << device_name << <span class="stringliteral">" has no parity defined in database !"</span> << endl;</div><div class="line">}</div></div><!-- fragment --><dl class="section return"><dt>Returns</dt><dd>True if DdDatum instance is empty</dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
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<tr><td class="paramname">WrongData</td><td>if requested </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a66304a562149bdb6d89858cbca65729e">◆ </a></span>operator<<()</h2>
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<td class="memname">void Tango::DbDatum::operator<< </td>
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<p>Inserters operators. </p>
<p>The insert and extract operators are specified for the following C++ types : </p><ul>
<li>bool </li>
<li>unsigned char </li>
<li>short </li>
<li>unsigned short </li>
<li>DevLong </li>
<li>DevULong </li>
<li>DevLong64 </li>
<li>DevULong64 </li>
<li>float </li>
<li>double </li>
<li>string </li>
<li>char* (insert only) </li>
<li>const char * </li>
<li>vector<string> </li>
<li>vector<short> </li>
<li>vector<unsigned short> </li>
<li>vector<DevLong> </li>
<li>vector<DevULong> </li>
<li>vector<DevLong64> </li>
<li>vector<DevULong64> </li>
<li>vector<float> </li>
<li>vector<double></li>
</ul>
<p>Here is an example of creating, inserting and extracting some <a class="el" href="classTango_1_1DbDatum.html" title="A database value.">DbDatum</a> types : </p><div class="fragment"><div class="line"><a class="code" href="classTango_1_1DbDatum.html#aeff53e61f2fa3a42ac930113af6b9f0c">DbDatum</a> my_short(<span class="stringliteral">"my_short"</span>), my_long(“my_long”), my_string(<span class="stringliteral">"my_string"</span>);</div><div class="line"><a class="code" href="classTango_1_1DbDatum.html#aeff53e61f2fa3a42ac930113af6b9f0c">DbDatum</a> my_float_vector(<span class="stringliteral">"my_float_vector"</span>), my_double_vector(<span class="stringliteral">"my_double_vector"</span>);</div><div class="line"> </div><div class="line"><span class="keywordtype">string</span> a_string;</div><div class="line"><span class="keywordtype">short</span> a_short;</div><div class="line">DevLong a_long;</div><div class="line">vector<float> a_float_vector;</div><div class="line">vector<double> a_double_vector;</div><div class="line"> </div><div class="line">my_short << 100; <span class="comment">// insert a short</span></div><div class="line">my_short >> a_short; <span class="comment">// extract a short</span></div><div class="line">my_long << 1000; <span class="comment">// insert a DevLong</span></div><div class="line">my_long >> a_long; <span class="comment">// extract a long</span></div><div class="line">my_string << string(<span class="stringliteral">"estas lista a bailar el tango ?"</span>); <span class="comment">// insert a string</span></div><div class="line">my_string >> a_string; <span class="comment">// extract a string</span></div><div class="line">my_float_vector << a_float_vector <span class="comment">// insert a vector of floats</span></div><div class="line">my_float_vector >> a_float_vector; <span class="comment">// extract a vector of floats</span></div><div class="line">my_double_vector << a_double_vector; <span class="comment">// insert a vector of doubles</span></div><div class="line">my_double_vector >> a_double_vector; <span class="comment">// extract a vector of doubles</span></div></div><!-- fragment --><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">val</td><td>Data to be inserted</td></tr>
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</dd>
</dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">WrongData</td><td>if requested </td></tr>
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</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#afd6ed9a2e6b129bcc9ae26e16ae4ef0b">◆ </a></span>operator>>()</h2>
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<td class="memname">bool Tango::DbDatum::operator>> </td>
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<td class="paramtype">bool & </td>
<td class="paramname"><em>val</em></td><td>)</td>
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<p>Extractors operators. </p>
<p>See documentation of the <a class="el" href="classTango_1_1DbDatum.html#a66304a562149bdb6d89858cbca65729e" title="Inserters operators.">DbDatum::operator<<</a> for details</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[out]</td><td class="paramname">val</td><td>Data to be initalized with database value </td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>A boolean set to true if the extraction succeeds </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">WrongData</td><td>if requested </td></tr>
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</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#a6c4f542a1f33e2ff5e7f2e16aded5679">◆ </a></span>reset_exceptions()</h2>
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<td class="memname">void Tango::DbDatum::reset_exceptions </td>
<td>(</td>
<td class="paramtype">except_flags </td>
<td class="paramname"><em>fl</em></td><td>)</td>
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<p>Reset one exception flag. </p>
<p>Resets one exception flag</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramdir">[in]</td><td class="paramname">fl</td><td>The exception flag </td></tr>
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</dd>
</dl>
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<h2 class="memtitle"><span class="permalink"><a href="#aff8fbe5d2dd3c816b1ff24c55fb1295a">◆ </a></span>set_exceptions()</h2>
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<td class="memname">void Tango::DbDatum::set_exceptions </td>
<td>(</td>
<td class="paramtype">except_flags </td>
<td class="paramname"><em>fl</em></td><td>)</td>
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<p>Set one exception flag. </p>
<p>Sets one exception flag. See <a class="el" href="classTango_1_1DbDatum.html#a332a7e23267e200c786a5b8486916205" title="Get exception flag.">DbDatum::exceptions()</a> for a usage example</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">fl</td><td>The exception flag </td></tr>
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</dd>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>dbapi.h</li>
</ul>
</div><!-- contents -->
</div><!-- doc-content -->
<div class="ttc" id="aclassTango_1_1DbDatum_html_aeff53e61f2fa3a42ac930113af6b9f0c"><div class="ttname"><a href="classTango_1_1DbDatum.html#aeff53e61f2fa3a42ac930113af6b9f0c">Tango::DbDatum::DbDatum</a></div><div class="ttdeci">DbDatum(string name)</div><div class="ttdoc">Create a DbDatum object.</div></div>
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