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<div class="title">optional.h File Reference</div> </div>
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<p>Container to hold optional data.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;string&gt;</code><br />
<code>#include &lt;utility&gt;</code><br />
<code>#include &lt;algorithm&gt;</code><br />
<code>#include &quot;<a class="el" href="3rdparty_2dmlc-core_2include_2dmlc_2base_8h_source.html">./base.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="common_8h_source.html">./common.h</a>&quot;</code><br />
<code>#include &quot;./logging.h&quot;</code><br />
<code>#include &quot;<a class="el" href="type__traits_8h_source.html">./type_traits.h</a>&quot;</code><br />
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Include dependency graph for optional.h:</div>
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<p><a href="optional_8h_source.html">Go to the source code of this file.</a></p>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structdmlc_1_1nullopt__t.html">dmlc::nullopt_t</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">dummy type for assign null to optional <a href="structdmlc_1_1nullopt__t.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classdmlc_1_1optional.html">dmlc::optional&lt; T &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">c++17 compatible optional class. <a href="classdmlc_1_1optional.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structstd_1_1hash_3_01dmlc_1_1optional_3_01T_01_4_01_4.html">std::hash&lt; dmlc::optional&lt; T &gt; &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">std hash function for optional <a href="structstd_1_1hash_3_01dmlc_1_1optional_3_01T_01_4_01_4.html#details">More...</a><br /></td></tr>
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<tr class="memdesc:namespacedmlc"><td class="mdescLeft">&#160;</td><td class="mdescRight">namespace for dmlc <br /></td></tr>
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<tr class="memitem:namespacestd"><td class="memItemLeft" align="right" valign="top"> &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="namespacestd.html">std</a></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:acf31f99192b5ed0d5d77398d58023912"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
<tr class="memitem:acf31f99192b5ed0d5d77398d58023912"><td class="memTemplItemLeft" align="right" valign="top">std::ostream &amp;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="namespacedmlc.html#acf31f99192b5ed0d5d77398d58023912">dmlc::operator&lt;&lt;</a> (std::ostream &amp;os, const optional&lt; T &gt; &amp;t)</td></tr>
<tr class="memdesc:acf31f99192b5ed0d5d77398d58023912"><td class="mdescLeft">&#160;</td><td class="mdescRight">serialize an optional object to string. <a href="namespacedmlc.html#acf31f99192b5ed0d5d77398d58023912">More...</a><br /></td></tr>
<tr class="separator:acf31f99192b5ed0d5d77398d58023912"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:acc4b71c13985425358cb63cc45d49512"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
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<tr class="memdesc:acc4b71c13985425358cb63cc45d49512"><td class="mdescLeft">&#160;</td><td class="mdescRight">parse a string object into optional&lt;T&gt; <a href="namespacedmlc.html#acc4b71c13985425358cb63cc45d49512">More...</a><br /></td></tr>
<tr class="separator:acc4b71c13985425358cb63cc45d49512"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5018d09b0f92f75d2c3ee572f62c0346"><td class="memItemLeft" align="right" valign="top">std::istream &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="namespacedmlc.html#a5018d09b0f92f75d2c3ee572f62c0346">dmlc::operator&gt;&gt;</a> (std::istream &amp;is, optional&lt; bool &gt; &amp;t)</td></tr>
<tr class="memdesc:a5018d09b0f92f75d2c3ee572f62c0346"><td class="mdescLeft">&#160;</td><td class="mdescRight">specialization of '&gt;&gt;' istream parsing for optional&lt;bool&gt; <a href="namespacedmlc.html#a5018d09b0f92f75d2c3ee572f62c0346">More...</a><br /></td></tr>
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<tr class="memitem:a6b77ebc5503453ec022a011c89e7d9a0"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="namespacedmlc.html#a6b77ebc5503453ec022a011c89e7d9a0">dmlc::DMLC_DECLARE_TYPE_NAME</a> (optional&lt; int &gt;,&quot;int or None&quot;)</td></tr>
<tr class="memdesc:a6b77ebc5503453ec022a011c89e7d9a0"><td class="mdescLeft">&#160;</td><td class="mdescRight">description for optional int <a href="namespacedmlc.html#a6b77ebc5503453ec022a011c89e7d9a0">More...</a><br /></td></tr>
<tr class="separator:a6b77ebc5503453ec022a011c89e7d9a0"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8190c53a1e172499c145a8bba96b9dae"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="namespacedmlc.html#a8190c53a1e172499c145a8bba96b9dae">dmlc::DMLC_DECLARE_TYPE_NAME</a> (optional&lt; bool &gt;,&quot;boolean or None&quot;)</td></tr>
<tr class="memdesc:a8190c53a1e172499c145a8bba96b9dae"><td class="mdescLeft">&#160;</td><td class="mdescRight">description for optional bool <a href="namespacedmlc.html#a8190c53a1e172499c145a8bba96b9dae">More...</a><br /></td></tr>
<tr class="separator:a8190c53a1e172499c145a8bba96b9dae"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa968c0e4fc27336c3fa3f6b42dbed591"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="namespacedmlc.html#aa968c0e4fc27336c3fa3f6b42dbed591">dmlc::DMLC_DECLARE_TYPE_NAME</a> (optional&lt; float &gt;,&quot;float or None&quot;)</td></tr>
<tr class="memdesc:aa968c0e4fc27336c3fa3f6b42dbed591"><td class="mdescLeft">&#160;</td><td class="mdescRight">description for optional float <a href="namespacedmlc.html#aa968c0e4fc27336c3fa3f6b42dbed591">More...</a><br /></td></tr>
<tr class="separator:aa968c0e4fc27336c3fa3f6b42dbed591"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:adc48dd106b1a9542db8a4baf13760bbc"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="namespacedmlc.html#adc48dd106b1a9542db8a4baf13760bbc">dmlc::DMLC_DECLARE_TYPE_NAME</a> (optional&lt; double &gt;,&quot;double or None&quot;)</td></tr>
<tr class="memdesc:adc48dd106b1a9542db8a4baf13760bbc"><td class="mdescLeft">&#160;</td><td class="mdescRight">description for optional double <a href="namespacedmlc.html#adc48dd106b1a9542db8a4baf13760bbc">More...</a><br /></td></tr>
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Variables</h2></td></tr>
<tr class="memitem:a7e0f62af45e67c3b6fa22080e756b379"><td class="memItemLeft" align="right" valign="top">constexpr const nullopt_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="namespacedmlc.html#a7e0f62af45e67c3b6fa22080e756b379">dmlc::nullopt</a> = nullopt_t(0)</td></tr>
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