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<a href="__algorithm_2count_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// SPDX-License-Identifier: BSL-1.0</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// SPDX-FileCopyrightText: Copyright (C) 2020 Tobias Hienzsch</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span> </div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#</span><span class="preprocessor">ifndef</span> <span class="preprocessor">TETL_ALGORITHM_COUNT_HPP</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#</span><span class="preprocessor">define</span> <span class="preprocessor">TETL_ALGORITHM_COUNT_HPP</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#</span><span class="preprocessor">include</span> <span class="preprocessor"><</span><span class="preprocessor">etl</span><span class="preprocessor">/</span><span class="preprocessor">_iterator</span><span class="preprocessor">/</span><span class="preprocessor">iterator_traits</span><span class="preprocessor">.</span><span class="preprocessor">hpp</span><span class="preprocessor">></span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span> </div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="keyword">namespace</span> <a class="code hl_namespace" href="namespaceetl.html">etl</a> {</div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment">/// \brief Returns the number of elements in the range `[first, last)`</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment">/// satisfying specific criteria. Counts the elements that are equal to value.</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment">///</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment">/// \param first The range of elements to examine.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment">/// \param last The range of elements to examine.</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment">/// \param value The value to search for.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment">///</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">/// https://en.cppreference.com/w/cpp/algorithm/count</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment">///</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment">/// \ingroup algorithm</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="keyword">template</span> <<span class="keyword">typename</span> InputIt, <span class="keyword">typename</span> T></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"><a class="line" href="group__algorithm.html#gacf27092e22460faafdb958cac56c6fec"> 22</a></span>[[nodiscard]] <span class="keyword">constexpr</span> <span class="keyword">auto</span> <a class="code hl_function" href="group__algorithm.html#gacf27092e22460faafdb958cac56c6fec">count</a>(InputIt first, InputIt last, T <span class="keyword">const</span>& value) -></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">typename</span> <a class="code hl_struct" href="structetl_1_1iterator__traits.html">iterator_traits</a><InputIt>::<a class="code hl_function" href="group__algorithm.html#gacf27092e22460faafdb958cac56c6fec">difference_type</a></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span>{</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">auto</span> result = <span class="keyword">typename</span> <a class="code hl_namespace" href="namespaceetl.html">etl</a>::<a class="code hl_struct" href="structetl_1_1iterator__traits.html">iterator_traits</a><InputIt>::difference_type{0};</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> <span class="keywordflow">for</span> (; first != last; ++first) {</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keywordflow">if</span> (*first == value) {</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> ++result;</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> }</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> }</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordflow">return</span> result;</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span>}</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span>} <span class="comment">// namespace etl</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> </div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="preprocessor">#</span><span class="preprocessor">endif</span> <span class="comment">// TETL_ALGORITHM_COUNT_HPP</span></div>
<div class="ttc" id="agroup__algorithm_html_gacf27092e22460faafdb958cac56c6fec"><div class="ttname"><a href="group__algorithm.html#gacf27092e22460faafdb958cac56c6fec">etl::count</a></div><div class="ttdeci">constexpr auto count(InputIt first, InputIt last, T const &value) -> typename iterator_traits< InputIt >::difference_type</div><div class="ttdoc">Returns the number of elements in the range [first, last) satisfying specific criteria....</div><div class="ttdef"><b>Definition</b> count.hpp:22</div></div>
<div class="ttc" id="anamespaceetl_html"><div class="ttname"><a href="namespaceetl.html">etl</a></div><div class="ttdef"><b>Definition</b> adjacent_find.hpp:9</div></div>
<div class="ttc" id="astructetl_1_1iterator__traits_html"><div class="ttname"><a href="structetl_1_1iterator__traits.html">etl::iterator_traits</a></div><div class="ttdoc">iterator_traits is the type trait class that provides uniform interface to the properties of LegacyIt...</div><div class="ttdef"><b>Definition</b> iterator_traits.hpp:48</div></div>
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