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<p>This is the special case for reference types.
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<p><code>#include &lt;<a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>&gt;</code></p>
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<tr class="memitem:ae0e39323497d71182ed4ff2c15f1e565"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ae0e39323497d71182ed4ff2c15f1e565">OptionalReferenceSwitch</a> () noexcept</td></tr>
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<tr class="memitem:a3855e845e3ac598bd3e5048518219b0a"><td class="memTemplParams" colspan="2">template&lt;class... Args&gt; </td></tr>
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<tr class="memitem:a079e5fefe2d24504f6742516fe515ffe"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classarmnn_1_1_optional_reference_switch.xhtml">OptionalReferenceSwitch</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a079e5fefe2d24504f6742516fe515ffe">operator=</a> (const T <a class="el" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ab657408af6365dc01548c8befa2011bf">value</a>)</td></tr>
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<tr class="memitem:ad20897c5c8bd47f5d4005989bead0e55"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ad20897c5c8bd47f5d4005989bead0e55">reset</a> ()</td></tr>
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<tr class="memitem:ab657408af6365dc01548c8befa2011bf"><td class="memItemLeft" align="right" valign="top">const T&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ab657408af6365dc01548c8befa2011bf">value</a> () const</td></tr>
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<tr class="inherit_header pub_methods_classarmnn_1_1_optional_base"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classarmnn_1_1_optional_base')"><img src="closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="classarmnn_1_1_optional_base.xhtml">OptionalBase</a></td></tr>
<tr class="memitem:ac2bde2f7113f72440ad3638eeb4d06f6 inherit pub_methods_classarmnn_1_1_optional_base"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_base.xhtml#ac2bde2f7113f72440ad3638eeb4d06f6">OptionalBase</a> () noexcept</td></tr>
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<tr class="memitem:a86b749ce2c4bc627fa8a1fcfaf0e314f inherit pub_methods_classarmnn_1_1_optional_base"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_base.xhtml#a86b749ce2c4bc627fa8a1fcfaf0e314f">has_value</a> () const noexcept</td></tr>
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<tr class="memitem:a420e60e9788bfa3b52aa3aab72ea3a5e inherit pub_methods_classarmnn_1_1_optional_base"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_base.xhtml#a420e60e9788bfa3b52aa3aab72ea3a5e">operator bool</a> () const noexcept</td></tr>
<tr class="memdesc:a420e60e9788bfa3b52aa3aab72ea3a5e inherit pub_methods_classarmnn_1_1_optional_base"><td class="mdescLeft">&#160;</td><td class="mdescRight">Conversion to bool, so can be used in if-statements and similar contexts expecting a bool. <a href="classarmnn_1_1_optional_base.xhtml#a420e60e9788bfa3b52aa3aab72ea3a5e">More...</a><br /></td></tr>
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<tr class="inherit_header pro_methods_classarmnn_1_1_optional_base"><td colspan="2" onclick="javascript:toggleInherit('pro_methods_classarmnn_1_1_optional_base')"><img src="closed.png" alt="-"/>&#160;Protected Member Functions inherited from <a class="el" href="classarmnn_1_1_optional_base.xhtml">OptionalBase</a></td></tr>
<tr class="memitem:a50b53f38c96fdf12c90890d2dfbb8719 inherit pro_methods_classarmnn_1_1_optional_base"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_base.xhtml#a50b53f38c96fdf12c90890d2dfbb8719">OptionalBase</a> (bool hasValue) noexcept</td></tr>
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<tr class="inherit_header pro_attribs_classarmnn_1_1_optional_base"><td colspan="2" onclick="javascript:toggleInherit('pro_attribs_classarmnn_1_1_optional_base')"><img src="closed.png" alt="-"/>&#160;Protected Attributes inherited from <a class="el" href="classarmnn_1_1_optional_base.xhtml">OptionalBase</a></td></tr>
<tr class="memitem:a53e87efb7e1b2df3dc4420dafaf2ee7e inherit pro_attribs_classarmnn_1_1_optional_base"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classarmnn_1_1_optional_base.xhtml#a53e87efb7e1b2df3dc4420dafaf2ee7e">m_HasValue</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename T&gt;<br />
class armnn::OptionalReferenceSwitch&lt; true, T &gt;</h3>
<p>This is the special case for reference types. </p>
<p>This holds a pointer to the referenced type. This doesn't own the referenced memory and it never calls delete on the pointer. </p>
<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00191">191</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
</div><h2 class="groupheader">Member Typedef Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a13da864f1d4a5e3957ba70473f8fbf8d">&#9670;&nbsp;</a></span>Base</h2>
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<td class="memname">using <a class="el" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">Base</a> = <a class="el" href="classarmnn_1_1_optional_base.xhtml">OptionalBase</a></td>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00194">194</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa35457bd4f798de06bf5742117fbaf16">&#9670;&nbsp;</a></span>NonRefT</h2>
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<td class="memname">using <a class="el" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#aa35457bd4f798de06bf5742117fbaf16">NonRefT</a> = typename std::remove_reference&lt;T&gt;::type</td>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00195">195</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
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<h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ae0e39323497d71182ed4ff2c15f1e565">&#9670;&nbsp;</a></span>OptionalReferenceSwitch() <span class="overload">[1/5]</span></h2>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00197">197</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160;: <a class="code" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">Base</a>{}, m_Storage{<span class="keyword">nullptr</span>} {}</div><div class="ttc" id="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4_xhtml_a13da864f1d4a5e3957ba70473f8fbf8d"><div class="ttname"><a href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">armnn::OptionalReferenceSwitch&lt; true, T &gt;::Base</a></div><div class="ttdeci">OptionalBase Base</div><div class="ttdef"><b>Definition:</b> <a href="_optional_8hpp_source.xhtml#l00194">Optional.hpp:194</a></div></div>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00198">198</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160;: <a class="code" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">Base</a>{}, m_Storage{<span class="keyword">nullptr</span>} {}</div><div class="ttc" id="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4_xhtml_a13da864f1d4a5e3957ba70473f8fbf8d"><div class="ttname"><a href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">armnn::OptionalReferenceSwitch&lt; true, T &gt;::Base</a></div><div class="ttdeci">OptionalBase Base</div><div class="ttdef"><b>Definition:</b> <a href="_optional_8hpp_source.xhtml#l00194">Optional.hpp:194</a></div></div>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00200">200</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; : <a class="code" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">Base</a>{}</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; {</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; *<span class="keyword">this</span> = other;</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; }</div><div class="ttc" id="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4_xhtml_a13da864f1d4a5e3957ba70473f8fbf8d"><div class="ttname"><a href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">armnn::OptionalReferenceSwitch&lt; true, T &gt;::Base</a></div><div class="ttdeci">OptionalBase Base</div><div class="ttdef"><b>Definition:</b> <a href="_optional_8hpp_source.xhtml#l00194">Optional.hpp:194</a></div></div>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00205">205</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; : <a class="code" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">Base</a>{<span class="keyword">true</span>}</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; , m_Storage{&amp;<a class="code" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ab657408af6365dc01548c8befa2011bf">value</a>}</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160; {</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160; }</div><div class="ttc" id="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4_xhtml_a13da864f1d4a5e3957ba70473f8fbf8d"><div class="ttname"><a href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#a13da864f1d4a5e3957ba70473f8fbf8d">armnn::OptionalReferenceSwitch&lt; true, T &gt;::Base</a></div><div class="ttdeci">OptionalBase Base</div><div class="ttdef"><b>Definition:</b> <a href="_optional_8hpp_source.xhtml#l00194">Optional.hpp:194</a></div></div>
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<td class="memname">~<a class="el" href="classarmnn_1_1_optional_reference_switch.xhtml">OptionalReferenceSwitch</a> </td>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00234">234</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160; {</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160; <a class="code" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ad20897c5c8bd47f5d4005989bead0e55">reset</a>();</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>&#160; }</div><div class="ttc" id="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4_xhtml_ad20897c5c8bd47f5d4005989bead0e55"><div class="ttname"><a href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ad20897c5c8bd47f5d4005989bead0e55">armnn::OptionalReferenceSwitch&lt; true, T &gt;::reset</a></div><div class="ttdeci">void reset()</div><div class="ttdef"><b>Definition:</b> <a href="_optional_8hpp_source.xhtml#l00239">Optional.hpp:239</a></div></div>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00214">214</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160; {</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; m_Storage = &amp;<a class="code" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ab657408af6365dc01548c8befa2011bf">value</a>;</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; Base::m_HasValue = <span class="keyword">true</span>;</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160; }</div><div class="ttc" id="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4_xhtml_ab657408af6365dc01548c8befa2011bf"><div class="ttname"><a href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ab657408af6365dc01548c8befa2011bf">armnn::OptionalReferenceSwitch&lt; true, T &gt;::value</a></div><div class="ttdeci">const T value() const</div><div class="ttdef"><b>Definition:</b> <a href="_optional_8hpp_source.xhtml#l00245">Optional.hpp:245</a></div></div>
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<td class="paramtype">const <a class="el" href="classarmnn_1_1_optional_reference_switch.xhtml">OptionalReferenceSwitch</a>&lt; <a class="el" href="_ref_layer_tests_8cpp.xhtml#a37f1c3ccc9fc906be85185350dd83d48">true</a>, T &gt; &amp;&#160;</td>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00221">221</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<p class="reference">References <a class="el" href="_optional_8hpp_source.xhtml#l00053">OptionalBase::has_value()</a>.</p>
<div class="fragment"><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160; {</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160; m_Storage = other.m_Storage;</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160; Base::m_HasValue = other.has_value();</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160; }</div></div><!-- fragment -->
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00228">228</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160; {</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160; <a class="code" href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ad20897c5c8bd47f5d4005989bead0e55">reset</a>();</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160; <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160; }</div><div class="ttc" id="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4_xhtml_ad20897c5c8bd47f5d4005989bead0e55"><div class="ttname"><a href="classarmnn_1_1_optional_reference_switch_3_01true_00_01_t_01_4.xhtml#ad20897c5c8bd47f5d4005989bead0e55">armnn::OptionalReferenceSwitch&lt; true, T &gt;::reset</a></div><div class="ttdeci">void reset()</div><div class="ttdef"><b>Definition:</b> <a href="_optional_8hpp_source.xhtml#l00239">Optional.hpp:239</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#ad20897c5c8bd47f5d4005989bead0e55">&#9670;&nbsp;</a></span>reset()</h2>
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00239">239</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160; {</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160; Base::m_HasValue = <span class="keyword">false</span>;</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>&#160; m_Storage = <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>&#160; }</div></div><!-- fragment -->
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00245">245</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>&#160; {</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>&#160; <span class="keywordflow">if</span> (!Base::has_value())</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>&#160; {</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>&#160; <span class="keywordflow">throw</span> BadOptionalAccessException(<span class="stringliteral">&quot;Optional has no value&quot;</span>);</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>&#160; }</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>&#160;</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>&#160; <span class="keywordflow">return</span> *m_Storage;</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>&#160; }</div></div><!-- fragment -->
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<p class="definition">Definition at line <a class="el" href="_optional_8hpp_source.xhtml#l00255">255</a> of file <a class="el" href="_optional_8hpp_source.xhtml">Optional.hpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>&#160; {</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>&#160; <span class="keywordflow">if</span> (!Base::has_value())</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>&#160; {</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>&#160; <span class="keywordflow">throw</span> BadOptionalAccessException(<span class="stringliteral">&quot;Optional has no value&quot;</span>);</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>&#160; }</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>&#160;</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>&#160; <span class="keywordflow">return</span> *m_Storage;</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>&#160; }</div></div><!-- fragment -->
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