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<li class="navelem"><a class="el" href="dir_17297ffb27ce571941f5fb5008f01a1f.html">dl</a></li><li class="navelem"><a class="el" href="dir_78beb56c8eba7ccc6c64d7863d88a69e.html">base</a></li> </ul>
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<div class="headertitle"><div class="title">dl_range_accumulate.h</div></div>
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<a href="dl__range__accumulate_8h.html">浏览该文件的文档.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#pragma once</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include <type_traits></span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span></div>
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<div class="foldopen" id="foldopen00017" data-start="{" data-end="}">
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"><a class="line" href="namespacedl_1_1_accumulate.html"> 17</a></span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacedl_1_1_accumulate.html">dl::Accumulate</a></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span>{</div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment">//因为减 和 除是逆操作，其值互反，所以这儿不实现</span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment">//标准库的accumulate需要传入初值，这里简化了</span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="keyword">template</span><<span class="keyword">typename</span> C></div>
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<div class="foldopen" id="foldopen00024" data-start="{" data-end="}">
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"><a class="line" href="namespacedl_1_1_accumulate.html#a5aae3338b23864044a7528767728b013"> 24</a></span><span class="keyword">constexpr</span> <span class="keyword">auto</span> <a class="code hl_function" href="namespacedl_1_1_accumulate.html#a5aae3338b23864044a7528767728b013">Add</a>(<span class="keyword">const</span> <a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132a0d61f8370cad1d412f80b84d143e1257">C</a>& container)</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span>{</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">using </span><a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132a5206560a306a2e085a437fd258eb57ce">V</a> = std::decay_t<<span class="keyword">decltype</span>(container)>;</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keyword">using </span><a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a> = <span class="keyword">typename</span> V::value_type;</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="keywordflow">if</span> (container.empty())</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> <span class="keywordflow">return</span> <a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a>{};</div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a> ret = *container.begin();</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> iter = container.begin() + 1; iter != container.end(); ++iter)</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> ret += *iter;</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordflow">return</span> ret;</div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span>}</div>
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</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span></div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="keyword">template</span><<span class="keyword">typename</span> C></div>
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<div class="foldopen" id="foldopen00038" data-start="{" data-end="}">
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"><a class="line" href="namespacedl_1_1_accumulate.html#aa0a7867fbb16d23cb50fdbbfb6d4d9e6"> 38</a></span><span class="keyword">constexpr</span> <span class="keyword">auto</span> <a class="code hl_function" href="namespacedl_1_1_accumulate.html#aa0a7867fbb16d23cb50fdbbfb6d4d9e6">Mul</a>(<span class="keyword">const</span> <a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132a0d61f8370cad1d412f80b84d143e1257">C</a>& container)</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span>{</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">using </span><a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132a5206560a306a2e085a437fd258eb57ce">V</a> = std::decay_t<<span class="keyword">decltype</span>(container)>;</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">using </span><a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a> = <span class="keyword">typename</span> V::value_type;</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keywordflow">if</span> (container.empty())</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordflow">return</span> <a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a>{};</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <a class="code hl_enumvalue" href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132ab9ece18c950afbfa6b0fdbfa4ff731d3">T</a> ret = *container.begin();</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> iter = container.begin() + 1; iter != container.end(); ++iter)</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> ret *= *iter;</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordflow">return</span> ret;</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span>}</div>
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</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span>}</div>
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</div>
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<div class="ttc" id="anamespacedl_1_1_accumulate_html"><div class="ttname"><a href="namespacedl_1_1_accumulate.html">dl::Accumulate</a></div><div class="ttdoc">所有元素操作，返回一个值</div><div class="ttdef"><b>定义</b> <a href="#l00017">dl_range_accumulate.h:18</a></div></div>
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<div class="ttc" id="anamespacedl_1_1_accumulate_html_a5aae3338b23864044a7528767728b013"><div class="ttname"><a href="namespacedl_1_1_accumulate.html#a5aae3338b23864044a7528767728b013">dl::Accumulate::Add</a></div><div class="ttdeci">constexpr auto Add(const C &container)</div><div class="ttdoc">求和sum</div><div class="ttdef"><b>定义</b> <a href="#l00024">dl_range_accumulate.h:24</a></div></div>
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<div class="ttc" id="anamespacedl_1_1_accumulate_html_aa0a7867fbb16d23cb50fdbbfb6d4d9e6"><div class="ttname"><a href="namespacedl_1_1_accumulate.html#aa0a7867fbb16d23cb50fdbbfb6d4d9e6">dl::Accumulate::Mul</a></div><div class="ttdeci">constexpr auto Mul(const C &container)</div><div class="ttdoc">求积product</div><div class="ttdef"><b>定义</b> <a href="#l00038">dl_range_accumulate.h:38</a></div></div>
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<div class="ttc" id="anamespacedl_html_a38a0162879cdbfbbe99ba16e7a170132a0d61f8370cad1d412f80b84d143e1257"><div class="ttname"><a href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132a0d61f8370cad1d412f80b84d143e1257">dl::KeyCode::C</a></div><div class="ttdeci">@ C</div><div class="ttdef"><b>定义</b> <a href="dl__input_8h_source.html#l00104">dl_input.h:104</a></div></div>
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<div class="ttc" id="anamespacedl_html_a38a0162879cdbfbbe99ba16e7a170132a5206560a306a2e085a437fd258eb57ce"><div class="ttname"><a href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132a5206560a306a2e085a437fd258eb57ce">dl::KeyCode::V</a></div><div class="ttdeci">@ V</div><div class="ttdef"><b>定义</b> <a href="dl__input_8h_source.html#l00123">dl_input.h:123</a></div></div>
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<div class="ttc" id="anamespacedl_html_a38a0162879cdbfbbe99ba16e7a170132ab9ece18c950afbfa6b0fdbfa4ff731d3"><div class="ttname"><a href="namespacedl.html#a38a0162879cdbfbbe99ba16e7a170132ab9ece18c950afbfa6b0fdbfa4ff731d3">dl::KeyCode::T</a></div><div class="ttdeci">@ T</div><div class="ttdef"><b>定义</b> <a href="dl__input_8h_source.html#l00121">dl_input.h:121</a></div></div>
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制作者 <a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.13.1
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