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 <span id="projectnumber">8.1</span>
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<div class="title">cached_log.cc</div> </div>
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<a href="cached__log_8cc.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2010-2018 Google LLC</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// You may obtain a copy of the License at</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">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// See the License for the specific language governing permissions and</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// limitations under the License.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "<a class="code" href="cached__log_8h.html">ortools/util/cached_log.h</a>"</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "<a class="code" href="base_2logging_8h.html">ortools/base/logging.h</a>"</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  </div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span><a class="code" href="namespaceoperations__research.html">operations_research</a> {</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"><a class="line" href="classoperations__research_1_1_cached_log.html#ae1b6cfbd5a270b0aaf545c12553c365d"> 20</a></span> <a class="code" href="classoperations__research_1_1_cached_log.html#ae1b6cfbd5a270b0aaf545c12553c365d">CachedLog::CachedLog</a>() {}</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  </div>
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<div class="line"><a name="l00022"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_cached_log.html#aabb304daa25e95ccfe16c0a8b30d437b"> 22</a></span> <a class="code" href="classoperations__research_1_1_cached_log.html#aabb304daa25e95ccfe16c0a8b30d437b">CachedLog::~CachedLog</a>() {}</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keywordtype">double</span> FastLog2(<a class="code" href="integral__types_8h.html#a7cde0074dfd288f2d70c0e035dacb28a">int64</a> <a class="code" href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a>) {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#if defined(_MSC_VER) || defined(__ANDROID__)</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">return</span> log(<span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(<a class="code" href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a>)) / log(2.0L);</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#else</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">return</span> log2(<a class="code" href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a>);</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> }</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> } <span class="comment">// namespace</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
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<div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_cached_log.html#aaee213c7596562bfe213e08cc7cab565"> 34</a></span> <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_cached_log.html#aaee213c7596562bfe213e08cc7cab565">CachedLog::Init</a>(<span class="keywordtype">int</span> size) {</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <a class="code" href="base_2logging_8h.html#a3e1cfef60e774a81f30eaddf26a3a274">CHECK</a>(cache_.empty());</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <a class="code" href="base_2logging_8h.html#a7e03ec13560fa94a8fea569960d7efc6">CHECK_GT</a>(size, 0);</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  cache_.resize(size, 0.0);</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < size; ++i) {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  cache_[i] = FastLog2(i + 1);</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  }</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> }</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="classoperations__research_1_1_cached_log.html#a2db03f2cb895369a4dfd99448ac6b498"> 43</a></span> <span class="keywordtype">double</span> <a class="code" href="classoperations__research_1_1_cached_log.html#a2db03f2cb895369a4dfd99448ac6b498">CachedLog::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>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <a class="code" href="base_2logging_8h.html#a7cc25402ecd7591b4c39934dd656b1f9">CHECK_GE</a>(<a class="code" href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a>, 1);</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">if</span> (<a class="code" href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a> <= cache_.size()) {</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> cache_[<a class="code" href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a> - 1];</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">return</span> FastLog2(<a class="code" href="parser_8yy_8cc.html#a5a634cf4429798b1c921a81de8250051">input</a>);</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="comment">// namespace operations_research</span></div>
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</div><!-- fragment --></div><!-- contents -->
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</div><!-- doc-content -->
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<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>
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<div class="ttc" id="abase_2logging_8h_html_a7cc25402ecd7591b4c39934dd656b1f9"><div class="ttname"><a href="base_2logging_8h.html#a7cc25402ecd7591b4c39934dd656b1f9">CHECK_GE</a></div><div class="ttdeci">#define CHECK_GE(val1, val2)</div><div class="ttdef"><b>Definition:</b> <a href="base_2logging_8h_source.html#l00701">base/logging.h:701</a></div></div>
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<div class="ttc" id="abase_2logging_8h_html"><div class="ttname"><a href="base_2logging_8h.html">logging.h</a></div></div>
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<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>
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<div class="ttc" id="abase_2logging_8h_html_a7e03ec13560fa94a8fea569960d7efc6"><div class="ttname"><a href="base_2logging_8h.html#a7e03ec13560fa94a8fea569960d7efc6">CHECK_GT</a></div><div class="ttdeci">#define CHECK_GT(val1, val2)</div><div class="ttdef"><b>Definition:</b> <a href="base_2logging_8h_source.html#l00702">base/logging.h:702</a></div></div>
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<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>
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<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>
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<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>
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<div class="ttc" id="acached__log_8h_html"><div class="ttname"><a href="cached__log_8h.html">cached_log.h</a></div></div>
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<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>
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<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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<div class="ttc" id="abase_2logging_8h_html_a3e1cfef60e774a81f30eaddf26a3a274"><div class="ttname"><a href="base_2logging_8h.html#a3e1cfef60e774a81f30eaddf26a3a274">CHECK</a></div><div class="ttdeci">#define CHECK(condition)</div><div class="ttdef"><b>Definition:</b> <a href="base_2logging_8h_source.html#l00495">base/logging.h:495</a></div></div>
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