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| <div class="title">theta_update_sketch_base.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"> * Licensed to the Apache Software Foundation (ASF) under one</span></div> |
| <div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * or more contributor license agreements. See the NOTICE file</span></div> |
| <div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * distributed with this work for additional information</span></div> |
| <div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * regarding copyright ownership. The ASF licenses this file</span></div> |
| <div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * to you under the Apache License, Version 2.0 (the</span></div> |
| <div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * "License"); you may not use this file except in compliance</span></div> |
| <div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * with the License. You may obtain a copy of the License at</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"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> *</span></div> |
| <div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * Unless required by applicable law or agreed to in writing,</span></div> |
| <div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * software distributed under the License is distributed on an</span></div> |
| <div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div> |
| <div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * KIND, either express or implied. See the License for the</span></div> |
| <div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * specific language governing permissions and limitations</span></div> |
| <div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * under the License.</span></div> |
| <div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> */</span></div> |
| <div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div> |
| <div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef THETA_UPDATE_SKETCH_BASE_HPP_</span></div> |
| <div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#define THETA_UPDATE_SKETCH_BASE_HPP_</span></div> |
| <div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div> |
| <div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <vector></span></div> |
| <div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <climits></span></div> |
| <div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <cmath></span></div> |
| <div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <iterator></span></div> |
| <div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div> |
| <div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include "MurmurHash3.h"</span></div> |
| <div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include "theta_comparators.hpp"</span></div> |
| <div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include "theta_constants.hpp"</span></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> <span class="keyword">namespace </span><a class="code" href="namespacedatasketches.html">datasketches</a> {</div> |
| <div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div> |
| <div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">template</span><</div> |
| <div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">typename</span> Entry,</div> |
| <div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keyword">typename</span> ExtractKey,</div> |
| <div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keyword">typename</span> Allocator</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">struct </span>theta_update_sketch_base {</div> |
| <div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">using</span> resize_factor = <a class="code" href="namespacedatasketches_1_1theta__constants.html#a329224ced789e065aed0698566b954a4">theta_constants::resize_factor</a>;</div> |
| <div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">using</span> comparator = compare_by_key<ExtractKey>;</div> |
| <div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div> |
| <div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  theta_update_sketch_base(uint8_t lg_cur_size, uint8_t lg_nom_size, resize_factor rf, <span class="keywordtype">float</span> p,</div> |
| <div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  uint64_t theta, uint64_t seed, <span class="keyword">const</span> Allocator& allocator, <span class="keywordtype">bool</span> is_empty = <span class="keyword">true</span>);</div> |
| <div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  theta_update_sketch_base(<span class="keyword">const</span> theta_update_sketch_base& other);</div> |
| <div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  theta_update_sketch_base(theta_update_sketch_base&& other) noexcept;</div> |
| <div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  ~theta_update_sketch_base();</div> |
| <div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  theta_update_sketch_base& operator=(<span class="keyword">const</span> theta_update_sketch_base& other);</div> |
| <div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  theta_update_sketch_base& operator=(theta_update_sketch_base&& other);</div> |
| <div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div> |
| <div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">using</span> iterator = Entry*;</div> |
| <div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  </div> |
| <div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">inline</span> uint64_t hash_and_screen(<span class="keyword">const</span> <span class="keywordtype">void</span>* data, <span class="keywordtype">size_t</span> length);</div> |
| <div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div> |
| <div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">inline</span> std::pair<iterator, bool> find(uint64_t key) <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">static</span> <span class="keyword">inline</span> std::pair<iterator, bool> find(Entry* entries, uint8_t lg_size, uint64_t key);</div> |
| <div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  </div> |
| <div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  </div> |
| <div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keyword">template</span><<span class="keyword">typename</span> FwdEntry></div> |
| <div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">inline</span> <span class="keywordtype">void</span> insert(iterator it, FwdEntry&& entry);</div> |
| <div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  </div> |
| <div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  iterator begin() <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  iterator end() <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div> |
| <div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// resize threshold = 0.5 tuned for speed</span></div> |
| <div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">static</span> constexpr <span class="keywordtype">double</span> RESIZE_THRESHOLD = 0.5;</div> |
| <div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// hash table rebuild threshold = 15/16</span></div> |
| <div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">static</span> constexpr <span class="keywordtype">double</span> REBUILD_THRESHOLD = 15.0 / 16.0;</div> |
| <div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div> |
| <div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">static</span> constexpr uint8_t STRIDE_HASH_BITS = 7;</div> |
| <div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">static</span> constexpr uint32_t STRIDE_MASK = (1 << STRIDE_HASH_BITS) - 1;</div> |
| <div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  </div> |
| <div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  Allocator allocator_;</div> |
| <div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordtype">bool</span> is_empty_;</div> |
| <div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  uint8_t lg_cur_size_;</div> |
| <div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  uint8_t lg_nom_size_;</div> |
| <div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  resize_factor rf_;</div> |
| <div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordtype">float</span> p_;</div> |
| <div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  uint32_t num_entries_;</div> |
| <div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  uint64_t theta_;</div> |
| <div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  uint64_t seed_;</div> |
| <div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  Entry* entries_;</div> |
| <div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div> |
| <div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordtype">void</span> resize();</div> |
| <div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordtype">void</span> rebuild();</div> |
| <div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">void</span> trim();</div> |
| <div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordtype">void</span> reset();</div> |
| <div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  </div> |
| <div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">static</span> <span class="keyword">inline</span> uint32_t get_capacity(uint8_t lg_cur_size, uint8_t lg_nom_size);</div> |
| <div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">static</span> <span class="keyword">inline</span> uint32_t get_stride(uint64_t key, uint8_t lg_size);</div> |
| <div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> consolidate_non_empty(Entry* entries, <span class="keywordtype">size_t</span> size, <span class="keywordtype">size_t</span> num);</div> |
| <div class="line"><a name="l00092"></a><span class="lineno"> 92</span> };</div> |
| <div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div> |
| <div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  </div> |
| <div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="keyword">template</span><<span class="keyword">typename</span> Derived, <span class="keyword">typename</span> Allocator></div> |
| <div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="classdatasketches_1_1theta__base__builder.html"> 97</a></span> <span class="keyword">class </span><a class="code" href="classdatasketches_1_1theta__base__builder.html">theta_base_builder</a> {</div> |
| <div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="keyword">public</span>:</div> |
| <div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <a class="code" href="classdatasketches_1_1theta__base__builder.html#a4b0aff81dd617849c00e8c1624a4218b">theta_base_builder</a>(<span class="keyword">const</span> Allocator& allocator);</div> |
| <div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div> |
| <div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  Derived& <a class="code" href="classdatasketches_1_1theta__base__builder.html#a249f556d18a3e5547e6ffef88d7e03ce">set_lg_k</a>(uint8_t lg_k);</div> |
| <div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  </div> |
| <div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  Derived& <a class="code" href="classdatasketches_1_1theta__base__builder.html#a872b7237127174b060f0f8ddd00fe7de">set_resize_factor</a>(resize_factor rf);</div> |
| <div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  </div> |
| <div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  Derived& <a class="code" href="classdatasketches_1_1theta__base__builder.html#ad17b87a607ca9cbeda22aca45d0a03b0">set_p</a>(<span class="keywordtype">float</span> p);</div> |
| <div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div> |
| <div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  Derived& <a class="code" href="classdatasketches_1_1theta__base__builder.html#aef1998c3c61c65a50d9500395d611c7a">set_seed</a>(uint64_t seed);</div> |
| <div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  </div> |
| <div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="keyword">protected</span>:</div> |
| <div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  Allocator allocator_;</div> |
| <div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  uint8_t lg_k_;</div> |
| <div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  resize_factor rf_;</div> |
| <div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordtype">float</span> p_;</div> |
| <div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  uint64_t seed_;</div> |
| <div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  </div> |
| <div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  uint64_t starting_theta() <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  uint8_t starting_lg_size() <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00146"></a><span class="lineno"> 146</span> };</div> |
| <div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  </div> |
| <div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment">// key extractor</span></div> |
| <div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div> |
| <div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="keyword">struct </span>trivial_extract_key {</div> |
| <div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keyword">template</span><<span class="keyword">typename</span> T></div> |
| <div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keyword">auto</span> operator()(T&& entry) <span class="keyword">const</span> -> decltype(std::forward<T>(entry)) {</div> |
| <div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">return</span> std::forward<T>(entry);</div> |
| <div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  }</div> |
| <div class="line"><a name="l00155"></a><span class="lineno"> 155</span> };</div> |
| <div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  </div> |
| <div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment">// key not zero</span></div> |
| <div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  </div> |
| <div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="keyword">template</span><<span class="keyword">typename</span> Entry, <span class="keyword">typename</span> ExtractKey></div> |
| <div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="keyword">class </span>key_not_zero {</div> |
| <div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="keyword">public</span>:</div> |
| <div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keywordtype">bool</span> operator()(<span class="keyword">const</span> Entry& entry)<span class="keyword"> const </span>{</div> |
| <div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">return</span> ExtractKey()(entry) != 0;</div> |
| <div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  }</div> |
| <div class="line"><a name="l00165"></a><span class="lineno"> 165</span> };</div> |
| <div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  </div> |
| <div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="keyword">template</span><<span class="keyword">typename</span> Key, <span class="keyword">typename</span> Entry, <span class="keyword">typename</span> ExtractKey></div> |
| <div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="keyword">class </span>key_not_zero_less_than {</div> |
| <div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="keyword">public</span>:</div> |
| <div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keyword">explicit</span> key_not_zero_less_than(<span class="keyword">const</span> Key& key): key(key) {}</div> |
| <div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordtype">bool</span> operator()(<span class="keyword">const</span> Entry& entry)<span class="keyword"> const </span>{</div> |
| <div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">return</span> ExtractKey()(entry) != 0 && ExtractKey()(entry) < this->key;</div> |
| <div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  }</div> |
| <div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="keyword">private</span>:</div> |
| <div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  Key key;</div> |
| <div class="line"><a name="l00176"></a><span class="lineno"> 176</span> };</div> |
| <div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  </div> |
| <div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment">// MurMur3 hash functions</span></div> |
| <div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  </div> |
| <div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="keyword">static</span> <span class="keyword">inline</span> uint64_t compute_hash(<span class="keyword">const</span> <span class="keywordtype">void</span>* data, <span class="keywordtype">size_t</span> length, uint64_t seed) {</div> |
| <div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  HashState hashes;</div> |
| <div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  MurmurHash3_x64_128(data, length, seed, hashes);</div> |
| <div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordflow">return</span> (hashes.h1 >> 1); <span class="comment">// Java implementation does unsigned shift >>> to make values positive</span></div> |
| <div class="line"><a name="l00184"></a><span class="lineno"> 184</span> }</div> |
| <div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  </div> |
| <div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="comment">// iterators</span></div> |
| <div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  </div> |
| <div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="keyword">template</span><<span class="keyword">typename</span> Entry, <span class="keyword">typename</span> ExtractKey></div> |
| <div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="keyword">class </span>theta_iterator {</div> |
| <div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="keyword">public</span>:</div> |
| <div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keyword">using</span> iterator_category = std::input_iterator_tag;</div> |
| <div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">using</span> value_type = Entry;</div> |
| <div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keyword">using</span> difference_type = std::ptrdiff_t;</div> |
| <div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keyword">using</span> pointer = Entry*;</div> |
| <div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keyword">using</span> reference = Entry&;</div> |
| <div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  </div> |
| <div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  theta_iterator(Entry* entries, uint32_t size, uint32_t index);</div> |
| <div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  theta_iterator& operator++();</div> |
| <div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  theta_iterator operator++(<span class="keywordtype">int</span>);</div> |
| <div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> theta_iterator& other) <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> theta_iterator& other) <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  reference operator*() <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  pointer operator->() <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  </div> |
| <div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="keyword">private</span>:</div> |
| <div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  Entry* entries_;</div> |
| <div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  uint32_t size_;</div> |
| <div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  uint32_t index_;</div> |
| <div class="line"><a name="l00209"></a><span class="lineno"> 209</span> };</div> |
| <div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  </div> |
| <div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="keyword">template</span><<span class="keyword">typename</span> Entry, <span class="keyword">typename</span> ExtractKey></div> |
| <div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="keyword">class </span>theta_const_iterator {</div> |
| <div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="keyword">public</span>:</div> |
| <div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keyword">using</span> iterator_category = std::input_iterator_tag;</div> |
| <div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keyword">using</span> value_type = <span class="keyword">const</span> Entry;</div> |
| <div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keyword">using</span> difference_type = std::ptrdiff_t;</div> |
| <div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keyword">using</span> pointer = <span class="keyword">const</span> Entry*;</div> |
| <div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keyword">using</span> reference = <span class="keyword">const</span> Entry&;</div> |
| <div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  </div> |
| <div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  theta_const_iterator(<span class="keyword">const</span> Entry* entries, uint32_t size, uint32_t index);</div> |
| <div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  theta_const_iterator& operator++();</div> |
| <div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  theta_const_iterator operator++(<span class="keywordtype">int</span>);</div> |
| <div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> theta_const_iterator& other) <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> theta_const_iterator& other) <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  reference operator*() <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  pointer operator->() <span class="keyword">const</span>;</div> |
| <div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  </div> |
| <div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="keyword">private</span>:</div> |
| <div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keyword">const</span> Entry* entries_;</div> |
| <div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  uint32_t size_;</div> |
| <div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  uint32_t index_;</div> |
| <div class="line"><a name="l00232"></a><span class="lineno"> 232</span> };</div> |
| <div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  </div> |
| <div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment">// double value canonicalization for compatibility with Java</span></div> |
| <div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="keyword">static</span> <span class="keyword">inline</span> int64_t canonical_double(<span class="keywordtype">double</span> value) {</div> |
| <div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keyword">union </span>{</div> |
| <div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  int64_t long_value;</div> |
| <div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordtype">double</span> double_value;</div> |
| <div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  } long_double_union;</div> |
| <div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  </div> |
| <div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordflow">if</span> (value == 0.0) {</div> |
| <div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  long_double_union.double_value = 0.0; <span class="comment">// canonicalize -0.0 to 0.0</span></div> |
| <div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (std::isnan(value)) {</div> |
| <div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  long_double_union.long_value = 0x7ff8000000000000L; <span class="comment">// canonicalize NaN using value from Java's Double.doubleToLongBits()</span></div> |
| <div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  } <span class="keywordflow">else</span> {</div> |
| <div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  long_double_union.double_value = value;</div> |
| <div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  }</div> |
| <div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordflow">return</span> long_double_union.long_value;</div> |
| <div class="line"><a name="l00249"></a><span class="lineno"> 249</span> }</div> |
| <div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  </div> |
| <div class="line"><a name="l00251"></a><span class="lineno"> 251</span> } <span class="comment">/* namespace datasketches */</span></div> |
| <div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  </div> |
| <div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="preprocessor">#include "theta_update_sketch_base_impl.hpp"</span></div> |
| <div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  </div> |
| <div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="preprocessor">#endif</span></div> |
| <div class="ttc" id="aclassdatasketches_1_1theta__base__builder_html"><div class="ttname"><a href="classdatasketches_1_1theta__base__builder.html">datasketches::theta_base_builder</a></div><div class="ttdoc">Theta base builder.</div><div class="ttdef"><b>Definition:</b> theta_update_sketch_base.hpp:97</div></div> |
| <div class="ttc" id="aclassdatasketches_1_1theta__base__builder_html_a249f556d18a3e5547e6ffef88d7e03ce"><div class="ttname"><a href="classdatasketches_1_1theta__base__builder.html#a249f556d18a3e5547e6ffef88d7e03ce">datasketches::theta_base_builder::set_lg_k</a></div><div class="ttdeci">Derived & set_lg_k(uint8_t lg_k)</div><div class="ttdoc">Set log2(k), where k is a nominal number of entries in the sketch.</div><div class="ttdef"><b>Definition:</b> theta_update_sketch_base_impl.hpp:312</div></div> |
| <div class="ttc" id="aclassdatasketches_1_1theta__base__builder_html_a4b0aff81dd617849c00e8c1624a4218b"><div class="ttname"><a href="classdatasketches_1_1theta__base__builder.html#a4b0aff81dd617849c00e8c1624a4218b">datasketches::theta_base_builder::theta_base_builder</a></div><div class="ttdeci">theta_base_builder(const Allocator &allocator)</div><div class="ttdoc">Creates and instance of the builder with default parameters.</div><div class="ttdef"><b>Definition:</b> theta_update_sketch_base_impl.hpp:304</div></div> |
| <div class="ttc" id="aclassdatasketches_1_1theta__base__builder_html_a872b7237127174b060f0f8ddd00fe7de"><div class="ttname"><a href="classdatasketches_1_1theta__base__builder.html#a872b7237127174b060f0f8ddd00fe7de">datasketches::theta_base_builder::set_resize_factor</a></div><div class="ttdeci">Derived & set_resize_factor(resize_factor rf)</div><div class="ttdoc">Set resize factor for the internal hash table (defaults to 8)</div><div class="ttdef"><b>Definition:</b> theta_update_sketch_base_impl.hpp:324</div></div> |
| <div class="ttc" id="aclassdatasketches_1_1theta__base__builder_html_ad17b87a607ca9cbeda22aca45d0a03b0"><div class="ttname"><a href="classdatasketches_1_1theta__base__builder.html#ad17b87a607ca9cbeda22aca45d0a03b0">datasketches::theta_base_builder::set_p</a></div><div class="ttdeci">Derived & set_p(float p)</div><div class="ttdoc">Set sampling probability (initial theta).</div><div class="ttdef"><b>Definition:</b> theta_update_sketch_base_impl.hpp:330</div></div> |
| <div class="ttc" id="aclassdatasketches_1_1theta__base__builder_html_aef1998c3c61c65a50d9500395d611c7a"><div class="ttname"><a href="classdatasketches_1_1theta__base__builder.html#aef1998c3c61c65a50d9500395d611c7a">datasketches::theta_base_builder::set_seed</a></div><div class="ttdeci">Derived & set_seed(uint64_t seed)</div><div class="ttdoc">Set the seed for the hash function.</div><div class="ttdef"><b>Definition:</b> theta_update_sketch_base_impl.hpp:337</div></div> |
| <div class="ttc" id="anamespacedatasketches_1_1theta__constants_html_a329224ced789e065aed0698566b954a4"><div class="ttname"><a href="namespacedatasketches_1_1theta__constants.html#a329224ced789e065aed0698566b954a4">datasketches::theta_constants::resize_factor</a></div><div class="ttdeci">datasketches::resize_factor resize_factor</div><div class="ttdoc">hash table resize factor</div><div class="ttdef"><b>Definition:</b> theta_constants.hpp:31</div></div> |
| <div class="ttc" id="anamespacedatasketches_html"><div class="ttname"><a href="namespacedatasketches.html">datasketches</a></div><div class="ttdoc">DataSketches namespace.</div><div class="ttdef"><b>Definition:</b> binomial_bounds.hpp:38</div></div> |
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