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manojsdoshi
2021-03-12 22:34:28 +00:00
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@@ -264,33 +264,33 @@ Public Member Functions</h2></td></tr>
<tr class="memitem:a925f5ebaa5822892447cf161e5a2960e"><td class="memTemplItemLeft" align="right" valign="top">T::value_type&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a925f5ebaa5822892447cf161e5a2960e">operator[]</a> (<a class="el" href="structripple_1_1TypedField.html">TypedField</a>&lt; T &gt; const &amp;f) const</td></tr>
<tr class="memdesc:a925f5ebaa5822892447cf161e5a2960e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the value of a field. <a href="classripple_1_1STObject.html#a925f5ebaa5822892447cf161e5a2960e">More...</a><br /></td></tr>
<tr class="separator:a925f5ebaa5822892447cf161e5a2960e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a1d617f20f05bb2a1fff16c8bafe1fb4c"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:a1d617f20f05bb2a1fff16c8bafe1fb4c"><td class="memTemplItemLeft" align="right" valign="top">boost::optional&lt; <a class="elRef" href="http://en.cppreference.com/w/cpp/types/decay.html">std::decay_t</a>&lt; typename T::value_type &gt; &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a1d617f20f05bb2a1fff16c8bafe1fb4c">operator[]</a> (<a class="el" href="structripple_1_1OptionaledField.html">OptionaledField</a>&lt; T &gt; const &amp;of) const</td></tr>
<tr class="memdesc:a1d617f20f05bb2a1fff16c8bafe1fb4c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the value of a field as boost::optional. <a href="classripple_1_1STObject.html#a1d617f20f05bb2a1fff16c8bafe1fb4c">More...</a><br /></td></tr>
<tr class="separator:a1d617f20f05bb2a1fff16c8bafe1fb4c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a12b48bd019e07a0392cb990172e6f952"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:a12b48bd019e07a0392cb990172e6f952"><td class="memTemplItemLeft" align="right" valign="top"><a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>&lt; <a class="elRef" href="http://en.cppreference.com/w/cpp/types/decay.html">std::decay_t</a>&lt; typename T::value_type &gt; &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a12b48bd019e07a0392cb990172e6f952">operator[]</a> (<a class="el" href="structripple_1_1OptionaledField.html">OptionaledField</a>&lt; T &gt; const &amp;of) const</td></tr>
<tr class="memdesc:a12b48bd019e07a0392cb990172e6f952"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the value of a field as a <a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>. <a href="classripple_1_1STObject.html#a12b48bd019e07a0392cb990172e6f952">More...</a><br /></td></tr>
<tr class="separator:a12b48bd019e07a0392cb990172e6f952"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a499ac01428b8a3402306d1b2f698cbe8"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:a499ac01428b8a3402306d1b2f698cbe8"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classripple_1_1STObject_1_1ValueProxy.html">ValueProxy</a>&lt; T &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a499ac01428b8a3402306d1b2f698cbe8">operator[]</a> (<a class="el" href="structripple_1_1TypedField.html">TypedField</a>&lt; T &gt; const &amp;f)</td></tr>
<tr class="memdesc:a499ac01428b8a3402306d1b2f698cbe8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get a modifiable field value. <a href="classripple_1_1STObject.html#a499ac01428b8a3402306d1b2f698cbe8">More...</a><br /></td></tr>
<tr class="separator:a499ac01428b8a3402306d1b2f698cbe8"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5d7819407bebb04b47dce1ce8003e7e9"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:a5d7819407bebb04b47dce1ce8003e7e9"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classripple_1_1STObject_1_1OptionalProxy.html">OptionalProxy</a>&lt; T &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a5d7819407bebb04b47dce1ce8003e7e9">operator[]</a> (<a class="el" href="structripple_1_1OptionaledField.html">OptionaledField</a>&lt; T &gt; const &amp;of)</td></tr>
<tr class="memdesc:a5d7819407bebb04b47dce1ce8003e7e9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Return a modifiable field value as boost::optional. <a href="classripple_1_1STObject.html#a5d7819407bebb04b47dce1ce8003e7e9">More...</a><br /></td></tr>
<tr class="memdesc:a5d7819407bebb04b47dce1ce8003e7e9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Return a modifiable field value as <a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>. <a href="classripple_1_1STObject.html#a5d7819407bebb04b47dce1ce8003e7e9">More...</a><br /></td></tr>
<tr class="separator:a5d7819407bebb04b47dce1ce8003e7e9"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a3ee3dd5d5a57cb6768e7f22f0a997d4e"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:a3ee3dd5d5a57cb6768e7f22f0a997d4e"><td class="memTemplItemLeft" align="right" valign="top">T::value_type&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a3ee3dd5d5a57cb6768e7f22f0a997d4e">at</a> (<a class="el" href="structripple_1_1TypedField.html">TypedField</a>&lt; T &gt; const &amp;f) const</td></tr>
<tr class="memdesc:a3ee3dd5d5a57cb6768e7f22f0a997d4e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the value of a field. <a href="classripple_1_1STObject.html#a3ee3dd5d5a57cb6768e7f22f0a997d4e">More...</a><br /></td></tr>
<tr class="separator:a3ee3dd5d5a57cb6768e7f22f0a997d4e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a0a0bcb3dcfd11f8a7df6f9a73dc6cd16"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:a0a0bcb3dcfd11f8a7df6f9a73dc6cd16"><td class="memTemplItemLeft" align="right" valign="top">boost::optional&lt; <a class="elRef" href="http://en.cppreference.com/w/cpp/types/decay.html">std::decay_t</a>&lt; typename T::value_type &gt; &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a0a0bcb3dcfd11f8a7df6f9a73dc6cd16">at</a> (<a class="el" href="structripple_1_1OptionaledField.html">OptionaledField</a>&lt; T &gt; const &amp;of) const</td></tr>
<tr class="memdesc:a0a0bcb3dcfd11f8a7df6f9a73dc6cd16"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the value of a field as boost::optional. <a href="classripple_1_1STObject.html#a0a0bcb3dcfd11f8a7df6f9a73dc6cd16">More...</a><br /></td></tr>
<tr class="separator:a0a0bcb3dcfd11f8a7df6f9a73dc6cd16"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a90f337e9b085352ddc4a555a1592c4af"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:a90f337e9b085352ddc4a555a1592c4af"><td class="memTemplItemLeft" align="right" valign="top"><a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>&lt; <a class="elRef" href="http://en.cppreference.com/w/cpp/types/decay.html">std::decay_t</a>&lt; typename T::value_type &gt; &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a90f337e9b085352ddc4a555a1592c4af">at</a> (<a class="el" href="structripple_1_1OptionaledField.html">OptionaledField</a>&lt; T &gt; const &amp;of) const</td></tr>
<tr class="memdesc:a90f337e9b085352ddc4a555a1592c4af"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the value of a field as <a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>. <a href="classripple_1_1STObject.html#a90f337e9b085352ddc4a555a1592c4af">More...</a><br /></td></tr>
<tr class="separator:a90f337e9b085352ddc4a555a1592c4af"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:abdaad1182c62a0dad986d6995d827afd"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:abdaad1182c62a0dad986d6995d827afd"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classripple_1_1STObject_1_1ValueProxy.html">ValueProxy</a>&lt; T &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#abdaad1182c62a0dad986d6995d827afd">at</a> (<a class="el" href="structripple_1_1TypedField.html">TypedField</a>&lt; T &gt; const &amp;f)</td></tr>
<tr class="memdesc:abdaad1182c62a0dad986d6995d827afd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get a modifiable field value. <a href="classripple_1_1STObject.html#abdaad1182c62a0dad986d6995d827afd">More...</a><br /></td></tr>
<tr class="separator:abdaad1182c62a0dad986d6995d827afd"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa4a6a809e0c100cb76d0f90aa4cc44d7"><td class="memTemplParams" colspan="2">template&lt;class T &gt; </td></tr>
<tr class="memitem:aa4a6a809e0c100cb76d0f90aa4cc44d7"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classripple_1_1STObject_1_1OptionalProxy.html">OptionalProxy</a>&lt; T &gt;&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#aa4a6a809e0c100cb76d0f90aa4cc44d7">at</a> (<a class="el" href="structripple_1_1OptionaledField.html">OptionaledField</a>&lt; T &gt; const &amp;of)</td></tr>
<tr class="memdesc:aa4a6a809e0c100cb76d0f90aa4cc44d7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Return a modifiable field value as boost::optional. <a href="classripple_1_1STObject.html#aa4a6a809e0c100cb76d0f90aa4cc44d7">More...</a><br /></td></tr>
<tr class="memdesc:aa4a6a809e0c100cb76d0f90aa4cc44d7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Return a modifiable field value as <a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>. <a href="classripple_1_1STObject.html#aa4a6a809e0c100cb76d0f90aa4cc44d7">More...</a><br /></td></tr>
<tr class="separator:aa4a6a809e0c100cb76d0f90aa4cc44d7"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a00db5bd22a73d188e8f2287fbdbc8e92"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classripple_1_1STObject.html#a00db5bd22a73d188e8f2287fbdbc8e92">set</a> (<a class="elRef" href="http://en.cppreference.com/w/cpp/memory/unique_ptr.html">std::unique_ptr</a>&lt; <a class="el" href="classripple_1_1STBase.html">STBase</a> &gt; v)</td></tr>
<tr class="memdesc:a00db5bd22a73d188e8f2287fbdbc8e92"><td class="mdescLeft">&#160;</td><td class="mdescRight">Set a field. <a href="classripple_1_1STObject.html#a00db5bd22a73d188e8f2287fbdbc8e92">More...</a><br /></td></tr>
@@ -2020,8 +2020,8 @@ template&lt;class T &gt; </div>
</div>
</div>
<a id="a1d617f20f05bb2a1fff16c8bafe1fb4c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1d617f20f05bb2a1fff16c8bafe1fb4c">&#9670;&nbsp;</a></span>operator[]() <span class="overload">[2/6]</span></h2>
<a id="a12b48bd019e07a0392cb990172e6f952"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a12b48bd019e07a0392cb990172e6f952">&#9670;&nbsp;</a></span>operator[]() <span class="overload">[2/6]</span></h2>
<div class="memitem">
<div class="memproto">
@@ -2029,7 +2029,7 @@ template&lt;class T &gt; </div>
template&lt;class T &gt; </div>
<table class="memname">
<tr>
<td class="memname">boost::optional&lt; <a class="elRef" href="http://en.cppreference.com/w/cpp/types/decay.html">std::decay_t</a>&lt; typename T::value_type &gt; &gt; ripple::STObject::operator[] </td>
<td class="memname"><a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>&lt; <a class="elRef" href="http://en.cppreference.com/w/cpp/types/decay.html">std::decay_t</a>&lt; typename T::value_type &gt; &gt; ripple::STObject::operator[] </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structripple_1_1OptionaledField.html">OptionaledField</a>&lt; T &gt; const &amp;&#160;</td>
<td class="paramname"><em>of</em></td><td>)</td>
@@ -2038,14 +2038,14 @@ template&lt;class T &gt; </div>
</table>
</div><div class="memdoc">
<p>Get the value of a field as boost::optional. </p>
<p>Get the value of a field as a <a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">An</td><td><a class="el" href="structripple_1_1OptionaledField.html" title="Indicate boost::optional field semantics.">OptionaledField</a> built from an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a> value representing the desired object field. In typical use, the <a class="el" href="structripple_1_1OptionaledField.html" title="Indicate boost::optional field semantics.">OptionaledField</a> will be constructed by using the ~ operator on an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a>. </td></tr>
<tr><td class="paramname">An</td><td><a class="el" href="structripple_1_1OptionaledField.html" title="Indicate std::optional field semantics.">OptionaledField</a> built from an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a> value representing the desired object field. In typical use, the <a class="el" href="structripple_1_1OptionaledField.html" title="Indicate std::optional field semantics.">OptionaledField</a> will be constructed by using the ~ operator on an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>boost::none if the field is not present, else the value of the specified field. </dd></dl>
<dl class="section return"><dt>Returns</dt><dd>std::nullopt if the field is not present, else the value of the specified field. </dd></dl>
<p class="definition">Definition at line <a class="el" href="STObject_8h_source.html#l00987">987</a> of file <a class="el" href="STObject_8h_source.html">STObject.h</a>.</p>
@@ -2104,14 +2104,14 @@ template&lt;class T &gt; </div>
</table>
</div><div class="memdoc">
<p>Return a modifiable field value as boost::optional. </p>
<p>Return a modifiable field value as <a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">An</td><td><a class="el" href="structripple_1_1OptionaledField.html" title="Indicate boost::optional field semantics.">OptionaledField</a> built from an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a> value representing the desired object field. In typical use, the <a class="el" href="structripple_1_1OptionaledField.html" title="Indicate boost::optional field semantics.">OptionaledField</a> will be constructed by using the ~ operator on an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a>. </td></tr>
<tr><td class="paramname">An</td><td><a class="el" href="structripple_1_1OptionaledField.html" title="Indicate std::optional field semantics.">OptionaledField</a> built from an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a> value representing the desired object field. In typical use, the <a class="el" href="structripple_1_1OptionaledField.html" title="Indicate std::optional field semantics.">OptionaledField</a> will be constructed by using the ~ operator on an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Transparent proxy object to an <code>optional</code> holding a modifiable reference to the value of the specified field. Returns boost::none if the field is not present. </dd></dl>
<dl class="section return"><dt>Returns</dt><dd>Transparent proxy object to an <code>optional</code> holding a modifiable reference to the value of the specified field. Returns std::nullopt if the field is not present. </dd></dl>
</div>
</div>
@@ -2152,8 +2152,8 @@ template&lt;class T &gt; </div>
</div>
</div>
<a id="a0a0bcb3dcfd11f8a7df6f9a73dc6cd16"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0a0bcb3dcfd11f8a7df6f9a73dc6cd16">&#9670;&nbsp;</a></span>at() <span class="overload">[2/6]</span></h2>
<a id="a90f337e9b085352ddc4a555a1592c4af"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a90f337e9b085352ddc4a555a1592c4af">&#9670;&nbsp;</a></span>at() <span class="overload">[2/6]</span></h2>
<div class="memitem">
<div class="memproto">
@@ -2161,7 +2161,7 @@ template&lt;class T &gt; </div>
template&lt;class T &gt; </div>
<table class="memname">
<tr>
<td class="memname">boost::optional&lt; <a class="elRef" href="http://en.cppreference.com/w/cpp/types/decay.html">std::decay_t</a>&lt; typename T::value_type &gt; &gt; ripple::STObject::at </td>
<td class="memname"><a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>&lt; <a class="elRef" href="http://en.cppreference.com/w/cpp/types/decay.html">std::decay_t</a>&lt; typename T::value_type &gt; &gt; ripple::STObject::at </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structripple_1_1OptionaledField.html">OptionaledField</a>&lt; T &gt; const &amp;&#160;</td>
<td class="paramname"><em>of</em></td><td>)</td>
@@ -2170,14 +2170,14 @@ template&lt;class T &gt; </div>
</table>
</div><div class="memdoc">
<p>Get the value of a field as boost::optional. </p>
<p>Get the value of a field as <a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">An</td><td><a class="el" href="structripple_1_1OptionaledField.html" title="Indicate boost::optional field semantics.">OptionaledField</a> built from an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a> value representing the desired object field. In typical use, the <a class="el" href="structripple_1_1OptionaledField.html" title="Indicate boost::optional field semantics.">OptionaledField</a> will be constructed by using the ~ operator on an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a>. </td></tr>
<tr><td class="paramname">An</td><td><a class="el" href="structripple_1_1OptionaledField.html" title="Indicate std::optional field semantics.">OptionaledField</a> built from an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a> value representing the desired object field. In typical use, the <a class="el" href="structripple_1_1OptionaledField.html" title="Indicate std::optional field semantics.">OptionaledField</a> will be constructed by using the ~ operator on an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>boost::none if the field is not present, else the value of the specified field. </dd></dl>
<dl class="section return"><dt>Returns</dt><dd>std::nullopt if the field is not present, else the value of the specified field. </dd></dl>
<p class="definition">Definition at line <a class="el" href="STObject_8h_source.html#l01034">1034</a> of file <a class="el" href="STObject_8h_source.html">STObject.h</a>.</p>
@@ -2236,14 +2236,14 @@ template&lt;class T &gt; </div>
</table>
</div><div class="memdoc">
<p>Return a modifiable field value as boost::optional. </p>
<p>Return a modifiable field value as <a class="elRef" href="http://en.cppreference.com/w/cpp/utility/optional.html">std::optional</a>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">An</td><td><a class="el" href="structripple_1_1OptionaledField.html" title="Indicate boost::optional field semantics.">OptionaledField</a> built from an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a> value representing the desired object field. In typical use, the <a class="el" href="structripple_1_1OptionaledField.html" title="Indicate boost::optional field semantics.">OptionaledField</a> will be constructed by using the ~ operator on an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a>. </td></tr>
<tr><td class="paramname">An</td><td><a class="el" href="structripple_1_1OptionaledField.html" title="Indicate std::optional field semantics.">OptionaledField</a> built from an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a> value representing the desired object field. In typical use, the <a class="el" href="structripple_1_1OptionaledField.html" title="Indicate std::optional field semantics.">OptionaledField</a> will be constructed by using the ~ operator on an <a class="el" href="classripple_1_1SField.html" title="Identifies fields.">SField</a>. </td></tr>
</table>
</dd>
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<dl class="section return"><dt>Returns</dt><dd>Transparent proxy object to an <code>optional</code> holding a modifiable reference to the value of the specified field. Returns boost::none if the field is not present. </dd></dl>
<dl class="section return"><dt>Returns</dt><dd>Transparent proxy object to an <code>optional</code> holding a modifiable reference to the value of the specified field. Returns std::nullopt if the field is not present. </dd></dl>
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