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<a href="cached__log_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// Copyright 2010-2018 Google LLC</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">// you may not use this file except in compliance with the License.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">//     http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">// distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">// See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">// limitations under the License.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160; </div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#ifndef OR_TOOLS_UTIL_CACHED_LOG_H_</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#define OR_TOOLS_UTIL_CACHED_LOG_H_</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;math.h&gt;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160; </div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</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">#include &quot;<a class="code" href="basictypes_8h.html">ortools/base/basictypes.h</a>&quot;</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="integral__types_8h.html">ortools/base/integral_types.h</a>&quot;</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="base_2logging_8h.html">ortools/base/logging.h</a>&quot;</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="macros_8h.html">ortools/base/macros.h</a>&quot;</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160; </div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceoperations__research.html">operations_research</a> {</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment">// This class is used when manipulating search space estimations.  It</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment">// provides fast access to log of a domain size.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">// Future Extensions:</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">//   - Sum of log on an array.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">//   - Sum of log on an array with callback.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160; </div>
<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_cached_log.html">   33</a></span>&#160;<span class="keyword">class </span><a class="code" href="classoperations__research_1_1_cached_log.html">CachedLog</a> {</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;  <a class="code" href="classoperations__research_1_1_cached_log.html#ae1b6cfbd5a270b0aaf545c12553c365d">CachedLog</a>();</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;  <a class="code" href="classoperations__research_1_1_cached_log.html#aabb304daa25e95ccfe16c0a8b30d437b">~CachedLog</a>();</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160; </div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;  <span class="comment">// This method can only be called once, and with a cache_size &gt; 0.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;  <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_cached_log.html#aaee213c7596562bfe213e08cc7cab565">Init</a>(<span class="keywordtype">int</span> cache_size);</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160; </div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;  <span class="comment">// Returns the log2 of &#39;input&#39;.</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;  <span class="keywordtype">double</span> <a class="code" href="classoperations__research_1_1_cached_log.html#a2db03f2cb895369a4dfd99448ac6b498">Log2</a>(<a class="code" href="integral__types_8h.html#a7cde0074dfd288f2d70c0e035dacb28a">int64</a> <a class="code" href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a>) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160; </div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;  std::vector&lt;double&gt; cache_;</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;  DISALLOW_COPY_AND_ASSIGN(<a class="code" href="classoperations__research_1_1_cached_log.html">CachedLog</a>);</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;};</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;}  <span class="comment">// namespace operations_research</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160; </div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor">#endif  // OR_TOOLS_UTIL_CACHED_LOG_H_</span></div>
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<div class="ttc" id="aintegral__types_8h_html"><div class="ttname"><a href="integral__types_8h.html">integral_types.h</a></div></div>
<div class="ttc" id="aclassoperations__research_1_1_cached_log_html"><div class="ttname"><a href="classoperations__research_1_1_cached_log.html">operations_research::CachedLog</a></div><div class="ttdef"><b>Definition:</b> <a href="cached__log_8h_source.html#l00033">cached_log.h:33</a></div></div>
<div class="ttc" id="aclassoperations__research_1_1_cached_log_html_a2db03f2cb895369a4dfd99448ac6b498"><div class="ttname"><a href="classoperations__research_1_1_cached_log.html#a2db03f2cb895369a4dfd99448ac6b498">operations_research::CachedLog::Log2</a></div><div class="ttdeci">double Log2(int64 input) const</div><div class="ttdef"><b>Definition:</b> <a href="cached__log_8cc_source.html#l00043">cached_log.cc:43</a></div></div>
<div class="ttc" id="abase_2logging_8h_html"><div class="ttname"><a href="base_2logging_8h.html">logging.h</a></div></div>
<div class="ttc" id="aclassoperations__research_1_1_cached_log_html_aaee213c7596562bfe213e08cc7cab565"><div class="ttname"><a href="classoperations__research_1_1_cached_log.html#aaee213c7596562bfe213e08cc7cab565">operations_research::CachedLog::Init</a></div><div class="ttdeci">void Init(int cache_size)</div><div class="ttdef"><b>Definition:</b> <a href="cached__log_8cc_source.html#l00034">cached_log.cc:34</a></div></div>
<div class="ttc" id="amacros_8h_html"><div class="ttname"><a href="macros_8h.html">macros.h</a></div></div>
<div class="ttc" id="anamespaceoperations__research_html"><div class="ttname"><a href="namespaceoperations__research.html">operations_research</a></div><div class="ttdoc">The vehicle routing library lets one model and solve generic vehicle routing problems ranging from th...</div><div class="ttdef"><b>Definition:</b> <a href="dense__doubly__linked__list_8h_source.html#l00021">dense_doubly_linked_list.h:21</a></div></div>
<div class="ttc" id="aintegral__types_8h_html_a7cde0074dfd288f2d70c0e035dacb28a"><div class="ttname"><a href="integral__types_8h.html#a7cde0074dfd288f2d70c0e035dacb28a">int64</a></div><div class="ttdeci">int64_t int64</div><div class="ttdef"><b>Definition:</b> <a href="integral__types_8h_source.html#l00034">integral_types.h:34</a></div></div>
<div class="ttc" id="aclassoperations__research_1_1_cached_log_html_ae1b6cfbd5a270b0aaf545c12553c365d"><div class="ttname"><a href="classoperations__research_1_1_cached_log.html#ae1b6cfbd5a270b0aaf545c12553c365d">operations_research::CachedLog::CachedLog</a></div><div class="ttdeci">CachedLog()</div><div class="ttdef"><b>Definition:</b> <a href="cached__log_8cc_source.html#l00020">cached_log.cc:20</a></div></div>
<div class="ttc" id="abasictypes_8h_html"><div class="ttname"><a href="basictypes_8h.html">basictypes.h</a></div></div>
<div class="ttc" id="aclassoperations__research_1_1_cached_log_html_aabb304daa25e95ccfe16c0a8b30d437b"><div class="ttname"><a href="classoperations__research_1_1_cached_log.html#aabb304daa25e95ccfe16c0a8b30d437b">operations_research::CachedLog::~CachedLog</a></div><div class="ttdeci">~CachedLog()</div><div class="ttdef"><b>Definition:</b> <a href="cached__log_8cc_source.html#l00022">cached_log.cc:22</a></div></div>
<div class="ttc" id="aparser_8yy_8cc_html_a5a634cf4429798b1c921a81de8250051"><div class="ttname"><a href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a></div><div class="ttdeci">static int input(yyscan_t yyscanner)</div></div>
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