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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>BitMagic-C++: sample9.cpp</title>
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<div class="title">sample9.cpp</div>  </div>
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<p>Example demonstrates binary distance metrics. BM library can compute various distances without materializing a product set.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__setalgo.html#ga5fb1131811b7b834dfc56a3874667a65" title="Computes bitcount of AND operation of two bitsets.">bm::count_and</a> </dd>
<dd>
<a class="el" href="group__setalgo.html#gadf4fa9461663c2edc6b7ab4f2171d981" title="Computes bitcount of XOR operation of two bitsets.">bm::count_xor</a> </dd>
<dd>
<a class="el" href="group__setalgo.html#gaa459d101c33f6dd415ec08cfb08028c4" title="Computes bitcount of SUB operation of two bitsets.">bm::count_sub</a> </dd>
<dd>
<a class="el" href="group__setalgo.html#ga85b3788a71ed50520e979202a416c9d9" title="Computes bitcount of OR operation of two bitsets.">bm::count_or</a> </dd>
<dd>
<a class="el" href="group__distance.html#ga2e245444837d51a20e463eea00a46c1c" title="Distance computing template function.">bm::distance_operation</a></dd></dl>
<p>For more information please visit: <a href="http://bmagic.sourceforge.net">http://bmagic.sourceforge.net</a></p>
<div class="fragment"><div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment">Copyright(c) 2002-2017 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div>
<div class="line"><span class="comment">you may not use this file except in compliance with the License.</span></div>
<div class="line"><span class="comment">You may obtain a copy of the License at</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">    http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><span class="comment">distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><span class="comment">WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><span class="comment">See the License for the specific language governing permissions and</span></div>
<div class="line"><span class="comment">limitations under the License.</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">For more information please visit:  http://bitmagic.io</span></div>
<div class="line"><span class="comment">*/</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">/** \example sample9.cpp</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">  Example demonstrates binary distance metrics. BM library can compute </span></div>
<div class="line"><span class="comment">  various distances without materializing a product set.</span></div>
<div class="line"><span class="comment"> </span></div>
<div class="line"><span class="comment">  \sa bm::count_and </span></div>
<div class="line"><span class="comment">  \sa bm::count_xor</span></div>
<div class="line"><span class="comment">  \sa bm::count_sub</span></div>
<div class="line"><span class="comment">  \sa bm::count_or</span></div>
<div class="line"><span class="comment">  \sa bm::distance_operation</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">   For more information please visit:  http://bmagic.sourceforge.net</span></div>
<div class="line"><span class="comment">*/</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">/*! \file sample9.cpp</span></div>
<div class="line"><span class="comment">    \brief Example: bvector&lt;&gt; binary similarity / distance algorithms</span></div>
<div class="line"><span class="comment">*/</span></div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="bm_8h.html">bm.h</a>&quot;</span></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="bmalgo_8h.html">bmalgo.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line"><span class="keyword">using namespace </span>std;</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> <a name="a0"></a><a class="code" href="sample9_8cpp.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line">    <span class="keywordflow">try</span></div>
<div class="line">    {</div>
<div class="line">        <a name="_a1"></a><a class="code" href="classbm_1_1bvector.html">bm::bvector&lt;&gt;</a>   bv1;</div>
<div class="line">        <a class="code" href="classbm_1_1bvector.html">bm::bvector&lt;&gt;</a>   bv2;</div>
<div class="line"> </div>
<div class="line">        bv1[10] = <span class="keyword">true</span>;</div>
<div class="line">        bv1[100] = <span class="keyword">true</span>;</div>
<div class="line">        bv1[10000] = <span class="keyword">true</span>;</div>
<div class="line">        </div>
<div class="line">        bv2[10] = <span class="keyword">true</span>;</div>
<div class="line">        bv2[100] = <span class="keyword">true</span>;</div>
<div class="line">        bv2[20000] = <span class="keyword">true</span>;</div>
<div class="line">        bv2[30000] = <span class="keyword">true</span>;</div>
<div class="line">        </div>
<div class="line">        <span class="comment">// Hamming distance:</span></div>
<div class="line">        </div>
<div class="line">        <span class="keyword">auto</span> hamming = <a name="a2"></a><a class="code" href="group__setalgo.html#gadf4fa9461663c2edc6b7ab4f2171d981">bm::count_xor</a>(bv1, bv2);</div>
<div class="line">        </div>
<div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Hamming distance = &quot;</span> &lt;&lt; hamming &lt;&lt; endl;</div>
<div class="line"> </div>
<div class="line">        <span class="comment">// Dice distance using basic distance functions</span></div>
<div class="line">        </div>
<div class="line">        <span class="keywordtype">double</span> dice =</div>
<div class="line">            double(2 * <a name="a3"></a><a class="code" href="group__setalgo.html#ga5fb1131811b7b834dfc56a3874667a65">bm::count_and</a>(bv1, bv2))/double(bv1.<a name="a4"></a><a class="code" href="classbm_1_1bvector.html#a3009ba9b116f13f4933a48641f3a695d">count</a>() + bv2.<a class="code" href="classbm_1_1bvector.html#a3009ba9b116f13f4933a48641f3a695d">count</a>());</div>
<div class="line">        </div>
<div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Dice distance = &quot;</span> &lt;&lt; dice &lt;&lt; endl;</div>
<div class="line">        </div>
<div class="line">        </div>
<div class="line">        <span class="comment">// Dice distance, can be computed using &quot;metric pipeline&quot;</span></div>
<div class="line">        </div>
<div class="line">        <a name="_a5"></a><a class="code" href="structbm_1_1distance__metric__descriptor.html">bm::distance_metric_descriptor</a> dmd[3];</div>
<div class="line">        dmd[0].<a name="a6"></a><a class="code" href="structbm_1_1distance__metric__descriptor.html#a3ece2ccdb7a6616f06a5a15679ccabb1">metric</a> = <a name="a7"></a><a class="code" href="group__distance.html#ggac38d64c8b27b652413a664cddd4d40abacb39376469ba778e9a9099ddbae5e7ce">bm::COUNT_AND</a>;</div>
<div class="line">        dmd[1].<a class="code" href="structbm_1_1distance__metric__descriptor.html#a3ece2ccdb7a6616f06a5a15679ccabb1">metric</a> = <a name="a8"></a><a class="code" href="group__distance.html#ggac38d64c8b27b652413a664cddd4d40abaac7947d53eb3acf81251ee4130e6a4a2">bm::COUNT_A</a>;</div>
<div class="line">        dmd[2].<a class="code" href="structbm_1_1distance__metric__descriptor.html#a3ece2ccdb7a6616f06a5a15679ccabb1">metric</a> = <a name="a9"></a><a class="code" href="group__distance.html#ggac38d64c8b27b652413a664cddd4d40abac6dbadf2ab9405daa47dc0f10d082516">bm::COUNT_B</a>;</div>
<div class="line">                </div>
<div class="line">        <a name="a10"></a><a class="code" href="group__distance.html#ga2e245444837d51a20e463eea00a46c1c">bm::distance_operation</a>(bv1, bv2, dmd, dmd+3);</div>
<div class="line">        </div>
<div class="line">        <span class="keywordtype">double</span> dice_p =</div>
<div class="line">            double(2 *  dmd[0].result) / double(dmd[1].result + dmd[2].result);</div>
<div class="line">        </div>
<div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Dice distance (pipeline) = &quot;</span> &lt;&lt; dice_p &lt;&lt; endl;</div>
<div class="line">    }</div>
<div class="line">    <span class="keywordflow">catch</span>(std::exception&amp; ex)</div>
<div class="line">    {</div>
<div class="line">        std::cerr &lt;&lt; ex.what() &lt;&lt; std::endl;</div>
<div class="line">        <span class="keywordflow">return</span> 1;</div>
<div class="line">    }</div>
<div class="line">    <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"> </div>
</div><!-- fragment --> </div><!-- contents -->
<div class="ttc" id="astructbm_1_1distance__metric__descriptor_html"><div class="ttname"><a href="structbm_1_1distance__metric__descriptor.html">bm::distance_metric_descriptor</a></div><div class="ttdoc">Distance metric descriptor, holds metric code and result.</div><div class="ttdef"><b>Definition:</b> <a href="bmalgo__impl_8h_source.html#l00087">bmalgo_impl.h:87</a></div></div>
<div class="ttc" id="abmalgo_8h_html"><div class="ttname"><a href="bmalgo_8h.html">bmalgo.h</a></div><div class="ttdoc">Algorithms for bvector&lt;&gt; (main include)</div></div>
<div class="ttc" id="aclassbm_1_1bvector_html"><div class="ttname"><a href="classbm_1_1bvector.html">bm::bvector&lt;&gt;</a></div></div>
<div class="ttc" id="aclassbm_1_1bvector_html_a3009ba9b116f13f4933a48641f3a695d"><div class="ttname"><a href="classbm_1_1bvector.html#a3009ba9b116f13f4933a48641f3a695d">bm::bvector::count</a></div><div class="ttdeci">size_type count() const BMNOEXCEPT</div><div class="ttdoc">population cout (count of ON bits)</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l02194">bm.h:2194</a></div></div>
<div class="ttc" id="agroup__distance_html_ggac38d64c8b27b652413a664cddd4d40abaac7947d53eb3acf81251ee4130e6a4a2"><div class="ttname"><a href="group__distance.html#ggac38d64c8b27b652413a664cddd4d40abaac7947d53eb3acf81251ee4130e6a4a2">bm::COUNT_A</a></div><div class="ttdeci">@ COUNT_A</div><div class="ttdoc">A.count()</div><div class="ttdef"><b>Definition:</b> <a href="bmalgo__impl_8h_source.html#l00064">bmalgo_impl.h:64</a></div></div>
<div class="ttc" id="astructbm_1_1distance__metric__descriptor_html_a3ece2ccdb7a6616f06a5a15679ccabb1"><div class="ttname"><a href="structbm_1_1distance__metric__descriptor.html#a3ece2ccdb7a6616f06a5a15679ccabb1">bm::distance_metric_descriptor::metric</a></div><div class="ttdeci">distance_metric metric</div><div class="ttdef"><b>Definition:</b> <a href="bmalgo__impl_8h_source.html#l00095">bmalgo_impl.h:95</a></div></div>
<div class="ttc" id="agroup__setalgo_html_gadf4fa9461663c2edc6b7ab4f2171d981"><div class="ttname"><a href="group__setalgo.html#gadf4fa9461663c2edc6b7ab4f2171d981">bm::count_xor</a></div><div class="ttdeci">bm::distance_metric_descriptor::size_type count_xor(const BV &amp;bv1, const BV &amp;bv2) BMNOEXCEPT</div><div class="ttdoc">Computes bitcount of XOR operation of two bitsets.</div><div class="ttdef"><b>Definition:</b> <a href="bmalgo_8h_source.html#l00081">bmalgo.h:81</a></div></div>
<div class="ttc" id="agroup__setalgo_html_ga5fb1131811b7b834dfc56a3874667a65"><div class="ttname"><a href="group__setalgo.html#ga5fb1131811b7b834dfc56a3874667a65">bm::count_and</a></div><div class="ttdeci">BV::size_type count_and(const BV &amp;bv1, const BV &amp;bv2) BMNOEXCEPT</div><div class="ttdoc">Computes bitcount of AND operation of two bitsets.</div><div class="ttdef"><b>Definition:</b> <a href="bmalgo_8h_source.html#l00049">bmalgo.h:49</a></div></div>
<div class="ttc" id="agroup__distance_html_ga2e245444837d51a20e463eea00a46c1c"><div class="ttname"><a href="group__distance.html#ga2e245444837d51a20e463eea00a46c1c">bm::distance_operation</a></div><div class="ttdeci">void distance_operation(const BV &amp;bv1, const BV &amp;bv2, distance_metric_descriptor *dmit, distance_metric_descriptor *dmit_end) BMNOEXCEPT</div><div class="ttdoc">Distance computing template function.</div><div class="ttdef"><b>Definition:</b> <a href="bmalgo__impl_8h_source.html#l00702">bmalgo_impl.h:702</a></div></div>
<div class="ttc" id="agroup__distance_html_ggac38d64c8b27b652413a664cddd4d40abac6dbadf2ab9405daa47dc0f10d082516"><div class="ttname"><a href="group__distance.html#ggac38d64c8b27b652413a664cddd4d40abac6dbadf2ab9405daa47dc0f10d082516">bm::COUNT_B</a></div><div class="ttdeci">@ COUNT_B</div><div class="ttdoc">B.count()</div><div class="ttdef"><b>Definition:</b> <a href="bmalgo__impl_8h_source.html#l00065">bmalgo_impl.h:65</a></div></div>
<div class="ttc" id="abm_8h_html"><div class="ttname"><a href="bm_8h.html">bm.h</a></div><div class="ttdoc">Compressed bit-vector bvector&lt;&gt; container, set algebraic methods, traversal iterators.</div></div>
<div class="ttc" id="agroup__distance_html_ggac38d64c8b27b652413a664cddd4d40abacb39376469ba778e9a9099ddbae5e7ce"><div class="ttname"><a href="group__distance.html#ggac38d64c8b27b652413a664cddd4d40abacb39376469ba778e9a9099ddbae5e7ce">bm::COUNT_AND</a></div><div class="ttdeci">@ COUNT_AND</div><div class="ttdoc">(A &amp; B).count()</div><div class="ttdef"><b>Definition:</b> <a href="bmalgo__impl_8h_source.html#l00059">bmalgo_impl.h:59</a></div></div>
<div class="ttc" id="asample9_8cpp_html_a840291bc02cba5474a4cb46a9b9566fe"><div class="ttname"><a href="sample9_8cpp.html#a840291bc02cba5474a4cb46a9b9566fe">main</a></div><div class="ttdeci">int main(void)</div><div class="ttdef"><b>Definition:</b> <a href="sample9_8cpp_source.html#l00047">sample9.cpp:47</a></div></div>
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