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<div class="title">thorough_hash.h</div> </div>
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<a href="thorough__hash_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> <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">#ifndef OR_TOOLS_BASE_THOROUGH_HASH_H_</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#define OR_TOOLS_BASE_THOROUGH_HASH_H_</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "<a class="code" href="integral__types_8h.html">ortools/base/integral_types.h</a>"</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</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="l00020"></a><span class="lineno"><a class="line" href="namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938"> 20</a></span> <span class="keyword">inline</span> <a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> <a class="code" href="namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938">MixTwoUInt64</a>(<a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> fp1, <a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> fp2) {</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="comment">// Two big prime numbers.</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keyword">const</span> <a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> kMul1 = 0xc6a4a7935bd1e995ULL;</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keyword">const</span> <a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> kMul2 = 0x228876a7198b743ULL;</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> <a class="code" href="constraint__solver_2table_8cc.html#af730895c6c6ef6e03caaf6251192dfd2">a</a> = fp1 * kMul1 + fp2 * kMul2;</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="comment">// Note: The following line also makes sure we never return 0 or 1, because we</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="comment">// will only add something to 'a' if there are any MSBs (the remaining bits</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// after the shift) being 0, in which case wrapping around would not happen.</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">return</span> <a class="code" href="constraint__solver_2table_8cc.html#af730895c6c6ef6e03caaf6251192dfd2">a</a> + (~<a class="code" href="constraint__solver_2table_8cc.html#af730895c6c6ef6e03caaf6251192dfd2">a</a> >> 47);</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> }</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// This should be better (collision-wise) than the default hash<string>, without</span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// being much slower. It never returns 0 or 1.</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="namespaceoperations__research.html#a8627f242a0332f34d29d85b6c57f1224"> 33</a></span> <span class="keyword">inline</span> <a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> <a class="code" href="namespaceoperations__research.html#a8627f242a0332f34d29d85b6c57f1224">ThoroughHash</a>(<span class="keyword">const</span> <span class="keywordtype">char</span>* bytes, <span class="keywordtype">size_t</span> len) {</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="comment">// Some big prime numer.</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> fp = 0xa5b85c5e198ed849ULL;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keyword">const</span> <span class="keywordtype">char</span>* end = bytes + len;</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">while</span> (bytes + 8 <= end) {</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  fp = <a class="code" href="namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938">MixTwoUInt64</a>(fp, *(<span class="keyword">reinterpret_cast<</span><span class="keyword">const </span><a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a>*<span class="keyword">></span>(bytes)));</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  bytes += 8;</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>  <span class="comment">// Note: we don't care about "consistency" (little or big endian) between</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// the bulk and the suffix of the message.</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <a class="code" href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a> last_bytes = 0;</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">while</span> (bytes < end) {</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  last_bytes += *bytes;</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  last_bytes <<= 8;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  bytes++;</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  }</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">return</span> <a class="code" href="namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938">MixTwoUInt64</a>(fp, last_bytes);</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> } <span class="comment">// namespace operations_research</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  </div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#endif </span><span class="comment">// OR_TOOLS_BASE_THOROUGH_HASH_H_</span></div>
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<div class="ttc" id="aconstraint__solver_2table_8cc_html_af730895c6c6ef6e03caaf6251192dfd2"><div class="ttname"><a href="constraint__solver_2table_8cc.html#af730895c6c6ef6e03caaf6251192dfd2">a</a></div><div class="ttdeci">int64 a</div><div class="ttdef"><b>Definition:</b> <a href="constraint__solver_2table_8cc_source.html#l00042">constraint_solver/table.cc:42</a></div></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>
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<div class="ttc" id="aintegral__types_8h_html_abc0f5bc07737e498f287334775dff2b6"><div class="ttname"><a href="integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6">uint64</a></div><div class="ttdeci">uint64_t uint64</div><div class="ttdef"><b>Definition:</b> <a href="integral__types_8h_source.html#l00039">integral_types.h:39</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="anamespaceoperations__research_html_a6748db3fd54f3ca8e43f0c52b8efc938"><div class="ttname"><a href="namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938">operations_research::MixTwoUInt64</a></div><div class="ttdeci">uint64 MixTwoUInt64(uint64 fp1, uint64 fp2)</div><div class="ttdef"><b>Definition:</b> <a href="thorough__hash_8h_source.html#l00020">thorough_hash.h:20</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_html_a8627f242a0332f34d29d85b6c57f1224"><div class="ttname"><a href="namespaceoperations__research.html#a8627f242a0332f34d29d85b6c57f1224">operations_research::ThoroughHash</a></div><div class="ttdeci">uint64 ThoroughHash(const char *bytes, size_t len)</div><div class="ttdef"><b>Definition:</b> <a href="thorough__hash_8h_source.html#l00033">thorough_hash.h:33</a></div></div>
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