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| <div class="title">universal_hash.hpp</div> </div> | ||
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| <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div> | ||
| <div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright 2021 The Regents of the University of California, Davis</span></div> | ||
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| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</span></div> | ||
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * you may not use this file except in compliance with the License.</span></div> | ||
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * You may obtain a copy of the License at</span></div> | ||
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> *</span></div> | ||
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> | ||
| <div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> *</span></div> | ||
| <div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div> | ||
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span></div> | ||
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div> | ||
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * See the License for the specific language governing permissions and</span></div> | ||
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * limitations under the License.</span></div> | ||
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| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  </div> | ||
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#pragma once</span></div> | ||
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span>bght {</div> | ||
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">template</span> <<span class="keyword">typename</span> Key></div> | ||
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">struct </span>universal_hash {</div> | ||
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keyword">using</span> key_type = Key;</div> | ||
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keyword">using</span> result_type = Key;</div> | ||
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  </div> | ||
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  __host__ __device__ constexpr universal_hash() : hash_x_(1), hash_y_(2) {}</div> | ||
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  </div> | ||
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  __host__ __device__ constexpr universal_hash(uint32_t hash_x, uint32_t hash_y)</div> | ||
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  : hash_x_(hash_x), hash_y_(hash_y) {}</div> | ||
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div> | ||
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  constexpr result_type __host__ __device__ operator()(<span class="keyword">const</span> key_type& key)<span class="keyword"> const </span>{</div> | ||
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">return</span> (((hash_x_ ^ key) + hash_y_) % prime_divisor);</div> | ||
| <div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  }</div> | ||
| <div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div> | ||
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  universal_hash(<span class="keyword">const</span> universal_hash&) = <span class="keywordflow">default</span>;</div> | ||
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  universal_hash(universal_hash&&) = <span class="keywordflow">default</span>;</div> | ||
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  universal_hash& operator=(universal_hash <span class="keyword">const</span>&) = <span class="keywordflow">default</span>;</div> | ||
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  universal_hash& operator=(universal_hash&&) = <span class="keywordflow">default</span>;</div> | ||
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  ~universal_hash() = <span class="keywordflow">default</span>;</div> | ||
| <div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div> | ||
| <div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">static</span> constexpr uint32_t prime_divisor = 4294967291u;</div> | ||
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div> | ||
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">private</span>:</div> | ||
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  uint32_t hash_x_;</div> | ||
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  uint32_t hash_y_;</div> | ||
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span> };</div> | ||
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span> } <span class="comment">// namespace bght</span></div> | ||
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