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<li class="navelem"><a class="el" href="dir_e96b5dfe115c13cdeb36484e37aec42e.html">theta</a></li><li class="navelem"><a class="el" href="dir_3f8742d40c9573c3b90638004faf146b.html">include</a></li> </ul>
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<div class="title">theta_set_difference_base_impl.hpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<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>&#160;<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>&#160;<span class="comment"> * distributed with this work for additional information</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<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>&#160;<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>&#160;<span class="comment"> * &quot;License&quot;); you may not use this file except in compliance</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<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>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<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>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<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>&#160;<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>&#160;<span class="comment"> * &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<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>&#160;<span class="comment"> * specific language governing permissions and limitations</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> * under the License.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#ifndef THETA_A_SET_DIFFERENCE_BASE_IMPL_HPP_</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor">#define THETA_A_SET_DIFFERENCE_BASE_IMPL_HPP_</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; </div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor">#include &lt;stdexcept&gt;</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="preprocessor">#include &quot;conditional_back_inserter.hpp&quot;</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="preprocessor">#include &quot;conditional_forward.hpp&quot;</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacedatasketches.html">datasketches</a> {</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; </div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> EN, <span class="keyword">typename</span> EK, <span class="keyword">typename</span> CS, <span class="keyword">typename</span> A&gt;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;theta_set_difference_base&lt;EN, EK, CS, A&gt;::theta_set_difference_base(uint64_t seed, <span class="keyword">const</span> A&amp; allocator):</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;allocator_(allocator),</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;seed_hash_(compute_seed_hash(seed))</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;{}</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> EN, <span class="keyword">typename</span> EK, <span class="keyword">typename</span> CS, <span class="keyword">typename</span> A&gt;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> FwdSketch, <span class="keyword">typename</span> Sketch&gt;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;CS theta_set_difference_base&lt;EN, EK, CS, A&gt;::compute(FwdSketch&amp;&amp; a, <span class="keyword">const</span> Sketch&amp; b, <span class="keywordtype">bool</span> ordered)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; <span class="keywordflow">if</span> (a.is_empty() || (a.get_num_retained() &gt; 0 &amp;&amp; b.is_empty())) <span class="keywordflow">return</span> CS(a, ordered);</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="keywordflow">if</span> (a.get_seed_hash() != seed_hash_) <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">&quot;A seed hash mismatch&quot;</span>);</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keywordflow">if</span> (b.get_seed_hash() != seed_hash_) <span class="keywordflow">throw</span> std::invalid_argument(<span class="stringliteral">&quot;B seed hash mismatch&quot;</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">const</span> uint64_t theta = std::min(a.get_theta64(), b.get_theta64());</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; std::vector&lt;EN, A&gt; entries(allocator_);</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keywordtype">bool</span> is_empty = a.is_empty();</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="keywordflow">if</span> (b.get_num_retained() == 0) {</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; std::copy_if(forward_begin(std::forward&lt;FwdSketch&gt;(a)), forward_end(std::forward&lt;FwdSketch&gt;(a)), std::back_inserter(entries),</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; key_less_than&lt;uint64_t, EN, EK&gt;(theta));</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keywordflow">if</span> (a.is_ordered() &amp;&amp; b.is_ordered()) { <span class="comment">// sort-based</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; std::set_difference(forward_begin(std::forward&lt;FwdSketch&gt;(a)), forward_end(std::forward&lt;FwdSketch&gt;(a)), b.begin(), b.end(),</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; conditional_back_inserter(entries, key_less_than&lt;uint64_t, EN, EK&gt;(theta)), comparator());</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; } <span class="keywordflow">else</span> { <span class="comment">// hash-based</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="keyword">const</span> uint8_t lg_size = lg_size_from_count(b.get_num_retained(), hash_table::REBUILD_THRESHOLD);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; hash_table table(lg_size, lg_size, hash_table::resize_factor::X1, 1, 0, 0, allocator_); <span class="comment">// theta and seed are not used here</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>&amp; entry: b) {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keyword">const</span> uint64_t hash = EK()(entry);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keywordflow">if</span> (hash &lt; theta) {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; table.insert(table.find(hash).first, hash);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (b.is_ordered()) {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="keywordflow">break</span>; <span class="comment">// early stop</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; }</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; }</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="comment">// scan A lookup B</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp;&amp; entry: a) {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="keyword">const</span> uint64_t hash = EK()(entry);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordflow">if</span> (hash &lt; theta) {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="keyword">auto</span> result = table.find(hash);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="keywordflow">if</span> (!result.second) entries.push_back(conditional_forward&lt;FwdSketch&gt;(entry));</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (a.is_ordered()) {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keywordflow">break</span>; <span class="comment">// early stop</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; }</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; }</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; }</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">if</span> (entries.empty() &amp;&amp; theta == theta_constants::MAX_THETA) is_empty = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; <span class="keywordflow">if</span> (ordered &amp;&amp; !a.is_ordered()) std::sort(entries.begin(), entries.end(), comparator());</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; <span class="keywordflow">return</span> CS(is_empty, a.is_ordered() || ordered, seed_hash_, theta, std::move(entries));</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;}</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;} <span class="comment">/* namespace datasketches */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;<span class="preprocessor">#endif</span></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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