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<li class="navelem"><a class="el" href="dir_df9c78dcf3f59a33b12284f95992a64b.html">ripple</a></li><li class="navelem"><a class="el" href="dir_5f536ab1985a8dcd28bcfd618bc58e92.html">basics</a></li> </ul>
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<div class="title">comparators.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//------------------------------------------------------------------------------</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> This file is part of rippled: https://github.com/ripple/rippled</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Copyright (c) 2012, 2013 Ripple Labs Inc.</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> Permission to use, copy, modify, and/or distribute this software for any</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> purpose with or without fee is hereby granted, provided that the above</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> copyright notice and this permission notice appear in all copies.</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">*/</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">//==============================================================================</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef RIPPLE_BASICS_COMPARATORS_H_INCLUDED</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#define RIPPLE_BASICS_COMPARATORS_H_INCLUDED</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/functional.html">functional</a>></span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span><a class="code" href="namespaceripple.html">ripple</a> {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  </div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#ifdef _MSC_VER</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * MSVC 2019 version 16.9.0 added [[nodiscard]] to the std comparison</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * operator() functions. boost::bimap checks that the comparitor is a</span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * BinaryFunction, in part by calling the function and ignoring the value.</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * These two things don't play well together. These wrapper classes simply</span></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * strip [[nodiscard]] from operator() for use in boost::bimap.</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * See also:</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * https://www.boost.org/doc/libs/1_75_0/libs/bimap/doc/html/boost_bimap/the_tutorial/controlling_collection_types.html</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">template</span> <<span class="keyword">class</span> T = <span class="keywordtype">void</span>></div>
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<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="structripple_1_1less.html"> 41</a></span> <span class="keyword">struct </span><a class="code" href="structripple_1_1less.html">less</a></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> {</div>
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<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="structripple_1_1less.html#a39673c5a3d487aad4a59571d85511f0f"> 43</a></span>  <span class="keyword">using</span> <a class="code" href="structripple_1_1less.html#a39673c5a3d487aad4a59571d85511f0f">result_type</a> = bool;</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  constexpr <span class="keywordtype">bool</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="structripple_1_1less.html#af163178e8109a20a34cb0ba910e452df"> 46</a></span>  <a class="code" href="structripple_1_1less.html#af163178e8109a20a34cb0ba910e452df">operator()</a>(<span class="keyword">const</span> T& left, <span class="keyword">const</span> T& right)<span class="keyword"> const</span></div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="keyword"> </span>{</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">return</span> <a class="codeRef" href="http://en.cppreference.com/w/cpp/utility/functional/less.html">std::less<T></a>()(left, right);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  }</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> };</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="keyword">template</span> <<span class="keyword">class</span> T = <span class="keywordtype">void</span>></div>
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<div class="line"><a name="l00053"></a><span class="lineno"><a class="line" href="structripple_1_1equal__to.html"> 53</a></span> <span class="keyword">struct </span><a class="code" href="structripple_1_1equal__to.html">equal_to</a></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> {</div>
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<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="structripple_1_1equal__to.html#a97b1fbe42f233ab839746bb9b6051479"> 55</a></span>  <span class="keyword">using</span> <a class="code" href="structripple_1_1equal__to.html#a97b1fbe42f233ab839746bb9b6051479">result_type</a> = bool;</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  constexpr <span class="keywordtype">bool</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"><a class="line" href="structripple_1_1equal__to.html#a035ebfa02ab37bbc1b08f70f534205f4"> 58</a></span>  <a class="code" href="structripple_1_1equal__to.html#a035ebfa02ab37bbc1b08f70f534205f4">operator()</a>(<span class="keyword">const</span> T& left, <span class="keyword">const</span> T& right)<span class="keyword"> const</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keyword"> </span>{</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> <a class="codeRef" href="http://en.cppreference.com/w/cpp/utility/functional/equal_to.html">std::equal_to<T></a>()(left, right);</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  }</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> };</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  </div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#else</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  </div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="keyword">template</span> <<span class="keyword">class</span> T = <span class="keywordtype">void</span>></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="keyword">using</span> less = <a class="codeRef" href="http://en.cppreference.com/w/cpp/utility/functional/less.html">std::less<T></a>;</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  </div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="keyword">template</span> <<span class="keyword">class</span> T = <span class="keywordtype">void</span>></div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="keyword">using</span> equal_to = <a class="codeRef" href="http://en.cppreference.com/w/cpp/utility/functional/equal_to.html">std::equal_to<T></a>;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  </div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  </div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> } <span class="comment">// namespace ripple</span></div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  </div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="preprocessor">#endif</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="afunctional_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/functional.html">functional</a></div></div>
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<div class="ttc" id="aless_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/functional/less.html">std::less< T ></a></div></div>
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<div class="ttc" id="astructripple_1_1less_html_a39673c5a3d487aad4a59571d85511f0f"><div class="ttname"><a href="structripple_1_1less.html#a39673c5a3d487aad4a59571d85511f0f">ripple::less::result_type</a></div><div class="ttdeci">bool result_type</div><div class="ttdef"><b>Definition:</b> <a href="comparators_8h_source.html#l00043">comparators.h:43</a></div></div>
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<div class="ttc" id="astructripple_1_1equal__to_html_a97b1fbe42f233ab839746bb9b6051479"><div class="ttname"><a href="structripple_1_1equal__to.html#a97b1fbe42f233ab839746bb9b6051479">ripple::equal_to::result_type</a></div><div class="ttdeci">bool result_type</div><div class="ttdef"><b>Definition:</b> <a href="comparators_8h_source.html#l00055">comparators.h:55</a></div></div>
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<div class="ttc" id="astructripple_1_1equal__to_html"><div class="ttname"><a href="structripple_1_1equal__to.html">ripple::equal_to</a></div><div class="ttdef"><b>Definition:</b> <a href="comparators_8h_source.html#l00053">comparators.h:53</a></div></div>
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<div class="ttc" id="aequal_to_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/functional/equal_to.html">std::equal_to< T ></a></div></div>
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<div class="ttc" id="anamespaceripple_html"><div class="ttname"><a href="namespaceripple.html">ripple</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition:</b> <a href="RCLCensorshipDetector_8h_source.html#l00029">RCLCensorshipDetector.h:29</a></div></div>
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<div class="ttc" id="astructripple_1_1less_html"><div class="ttname"><a href="structripple_1_1less.html">ripple::less</a></div><div class="ttdef"><b>Definition:</b> <a href="comparators_8h_source.html#l00041">comparators.h:41</a></div></div>
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<div class="ttc" id="astructripple_1_1less_html_af163178e8109a20a34cb0ba910e452df"><div class="ttname"><a href="structripple_1_1less.html#af163178e8109a20a34cb0ba910e452df">ripple::less::operator()</a></div><div class="ttdeci">constexpr bool operator()(const T &left, const T &right) const</div><div class="ttdef"><b>Definition:</b> <a href="comparators_8h_source.html#l00046">comparators.h:46</a></div></div>
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<div class="ttc" id="astructripple_1_1equal__to_html_a035ebfa02ab37bbc1b08f70f534205f4"><div class="ttname"><a href="structripple_1_1equal__to.html#a035ebfa02ab37bbc1b08f70f534205f4">ripple::equal_to::operator()</a></div><div class="ttdeci">constexpr bool operator()(const T &left, const T &right) const</div><div class="ttdef"><b>Definition:</b> <a href="comparators_8h_source.html#l00058">comparators.h:58</a></div></div>
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