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<div class="title">optional.hpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright (C) 2011 - 2012 Andrzej Krzemienski.</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// Use, modification, and distribution is subject to the Boost Software</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">//</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment">// The idea and interface is based on Boost.Optional library</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment">// authored by Fernando Luis Cacciola Carballal</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor"># ifndef ___OPTIONAL_HPP___</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor"># define ___OPTIONAL_HPP___</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor"># include &lt;utility&gt;</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor"># include &lt;type_traits&gt;</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor"># include &lt;initializer_list&gt;</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor"># include &lt;cassert&gt;</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor"># include &lt;functional&gt;</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor"># include &lt;string&gt;</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor"># include &quot;athena/Global.hpp&quot;</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_REQUIRES(...) typename enable_if&lt;__VA_ARGS__::value, bool&gt;::type = false</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor"># if defined __GNUC__ // NOTE: GNUC is also defined for Clang</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor"># if (__GNUC__ == 4) &amp;&amp; (__GNUC_MINOR__ &gt;= 8)</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="preprocessor"># elif (__GNUC__ &gt; 4)</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="preprocessor"># define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor"># endif</span>
<div class="ttc" id="unionstd_1_1experimental_1_1constexpr__storage__t_html"><div class="ttname"><a href="unionstd_1_1experimental_1_1constexpr__storage__t.html">std::experimental::constexpr_storage_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:282</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1nullopt__t_html"><div class="ttname"><a href="structstd_1_1experimental_1_1nullopt__t.html">std::experimental::nullopt_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:250</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign_html"><div class="ttname"><a href="structstd_1_1experimental_1_1is__nothrow__move__assignable_1_1has__nothrow__move__assign.html">std::experimental::is_nothrow_move_assignable::has_nothrow_move_assign</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:156</div></div>
<div class="ttc" id="namespacestd_html"><div class="ttname"><a href="namespacestd.html">std</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:100</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1nullopt__t_1_1init_html"><div class="ttname"><a href="structstd_1_1experimental_1_1nullopt__t_1_1init.html">std::experimental::nullopt_t::init</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:252</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1detail___1_1has__overloaded__addressof_html"><div class="ttname"><a href="structstd_1_1experimental_1_1detail___1_1has__overloaded__addressof.html">std::experimental::detail_::has_overloaded_addressof</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:211</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1is__assignable_html"><div class="ttname"><a href="structstd_1_1experimental_1_1is__assignable.html">std::experimental::is_assignable</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:139</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1in__place__t_html"><div class="ttname"><a href="structstd_1_1experimental_1_1in__place__t.html">std::experimental::in_place_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:246</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1constexpr__optional__base_html"><div class="ttname"><a href="structstd_1_1experimental_1_1constexpr__optional__base.html">std::experimental::constexpr_optional_base</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:320</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1is__nothrow__move__assignable_html"><div class="ttname"><a href="structstd_1_1experimental_1_1is__nothrow__move__assignable.html">std::experimental::is_nothrow_move_assignable</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:153</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1trivial__init__t_html"><div class="ttname"><a href="structstd_1_1experimental_1_1trivial__init__t.html">std::experimental::trivial_init_t</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:242</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1optional__base_html"><div class="ttname"><a href="structstd_1_1experimental_1_1optional__base.html">std::experimental::optional_base</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:297</div></div>
<div class="ttc" id="classstd_1_1experimental_1_1bad__optional__access_html"><div class="ttname"><a href="classstd_1_1experimental_1_1bad__optional__access.html">std::experimental::bad_optional_access</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:259</div></div>
<div class="ttc" id="classstd_1_1experimental_1_1optional_html"><div class="ttname"><a href="classstd_1_1experimental_1_1optional.html">std::experimental::optional</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:175</div></div>
<div class="ttc" id="structstd_1_1experimental_1_1is__nothrow__move__constructible_html"><div class="ttname"><a href="structstd_1_1experimental_1_1is__nothrow__move__constructible.html">std::experimental::is_nothrow_move_constructible</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:132</div></div>
<div class="ttc" id="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4_html"><div class="ttname"><a href="classstd_1_1experimental_1_1optional_3_01T_01_6_01_4.html">std::experimental::optional&lt; T &amp; &gt;</a></div><div class="ttdef"><b>Definition:</b> optional.hpp:610</div></div>
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