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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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<p>Example for finding first and last bits in bit-vector (dynamic range).Ranges of bit-vectors can be used to find probability of intersection. For instance, in some corner cases AND product can be predicted empty if vectors belong to different ranges. </p><pre class="fragment">@sa bm::bvector&lt;&gt;::find()
@sa bm::bvector&lt;&gt;::find_reverse()
@sa bm::bvector&lt;&gt;::find_range()
</pre><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 sample15.cpp</span></div>
<div class="line"><span class="comment">Example for finding first and last bits in bit-vector (dynamic range).</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">Ranges of bit-vectors can be used to find probability of intersection.</span></div>
<div class="line"><span class="comment">For instance, in some corner cases AND product can be predicted empty if vectors</span></div>
<div class="line"><span class="comment">belong to different ranges.</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">    @sa bm::bvector&lt;&gt;::find()</span></div>
<div class="line"><span class="comment">    @sa bm::bvector&lt;&gt;::find_reverse()</span></div>
<div class="line"><span class="comment">    @sa bm::bvector&lt;&gt;::find_range()</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 sample15.cpp</span></div>
<div class="line"><span class="comment">    \brief Example: bvector&lt;&gt; methods to find last bit and bit-vectors effective range</span></div>
<div class="line"><span class="comment">*/</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;vector&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"> </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="keyword">const</span> <span class="keywordtype">unsigned</span> <a name="a0"></a><a class="code" href="sample15_8cpp.html#a8652d848be89c1f9b0a77327ee32fc0f">MAX_VALUE</a> = 10000000;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span></div>
<div class="line"><span class="keywordtype">void</span> <a name="a1"></a><a class="code" href="sample15_8cpp.html#a20e0b4b93aca798208bbc2cda0ea1db4">fill_bvector</a>(<a name="_a2"></a><a class="code" href="classbm_1_1bvector.html">bm::bvector&lt;&gt;</a>* bv)</div>
<div class="line">{</div>
<div class="line">    <span class="keywordtype">unsigned</span> start = <a class="code" href="sample15_8cpp.html#a8652d848be89c1f9b0a77327ee32fc0f">MAX_VALUE</a> / (rand()%10);</div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = start; i &lt; <a class="code" href="sample15_8cpp.html#a8652d848be89c1f9b0a77327ee32fc0f">MAX_VALUE</a>; ++i)</div>
<div class="line">    {</div>
<div class="line">        <span class="keywordflow">if</span> ((rand() % 10))</div>
<div class="line">        {</div>
<div class="line">            bv-&gt;<a name="a3"></a><a class="code" href="classbm_1_1bvector.html#a52b4259a5cc4ebd8953832c696e24f02">set</a>(i);</div>
<div class="line">        }</div>
<div class="line">    }</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> <a name="a4"></a><a class="code" href="sample15_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 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">        <a class="code" href="sample15_8cpp.html#a20e0b4b93aca798208bbc2cda0ea1db4">fill_bvector</a>(&amp;bv1);</div>
<div class="line">        <a class="code" href="sample15_8cpp.html#a20e0b4b93aca798208bbc2cda0ea1db4">fill_bvector</a>(&amp;bv2);</div>
<div class="line">        </div>
<div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;bv1 count = &quot;</span> &lt;&lt; bv1.<a name="a5"></a><a class="code" href="classbm_1_1bvector.html#a3009ba9b116f13f4933a48641f3a695d">count</a>() &lt;&lt; endl;</div>
<div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;bv2 count = &quot;</span> &lt;&lt; bv2.<a class="code" href="classbm_1_1bvector.html#a3009ba9b116f13f4933a48641f3a695d">count</a>() &lt;&lt; endl;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordtype">bool</span> found;</div>
<div class="line">        <a class="code" href="classbm_1_1bvector.html#a405dd9ed048c935c84a5086ec8ba3649">bm::bvector&lt;&gt;::size_type</a> first, last;</div>
<div class="line">        </div>
<div class="line">        found = bv1.<a name="a6"></a><a class="code" href="classbm_1_1bvector.html#a08093c98bb6dfe27708357801aae7280">find</a>(first);</div>
<div class="line">        <span class="keywordflow">if</span> (found)</div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;bv1 first = &quot;</span> &lt;&lt; first &lt;&lt; endl;</div>
<div class="line">        </div>
<div class="line">        found = bv1.<a name="a7"></a><a class="code" href="classbm_1_1bvector.html#ada8a47cb4a23e1402a7a6d728e35d50f">find_reverse</a>(last);</div>
<div class="line">        <span class="keywordflow">if</span> (found)</div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;bv1 last = &quot;</span> &lt;&lt; last &lt;&lt; endl;</div>
<div class="line"> </div>
<div class="line">        found = bv2.<a class="code" href="classbm_1_1bvector.html#a08093c98bb6dfe27708357801aae7280">find</a>(first);</div>
<div class="line">        <span class="keywordflow">if</span> (found)</div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;bv2 first = &quot;</span> &lt;&lt; first &lt;&lt; endl;</div>
<div class="line">        </div>
<div class="line">        found = bv2.<a class="code" href="classbm_1_1bvector.html#ada8a47cb4a23e1402a7a6d728e35d50f">find_reverse</a>(last);</div>
<div class="line">        <span class="keywordflow">if</span> (found)</div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;bv2 last = &quot;</span> &lt;&lt; last &lt;&lt; endl;</div>
<div class="line">        </div>
<div class="line">        found = bv1.<a name="a8"></a><a class="code" href="classbm_1_1bvector.html#a509670c79426e6388396c7720519f5c1">find_range</a>(first, last);</div>
<div class="line">        <span class="keywordflow">if</span> (found)</div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;bv1 range = [&quot;</span> &lt;&lt; first &lt;&lt; <span class="stringliteral">&quot;, &quot;</span> &lt;&lt; last &lt;&lt; <span class="stringliteral">&quot;]&quot;</span> &lt;&lt; endl;</div>
<div class="line">        </div>
<div class="line">        found = bv2.<a class="code" href="classbm_1_1bvector.html#a509670c79426e6388396c7720519f5c1">find_range</a>(first, last);</div>
<div class="line">        <span class="keywordflow">if</span> (found)</div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;bv2 range = [&quot;</span> &lt;&lt; first &lt;&lt; <span class="stringliteral">&quot;, &quot;</span> &lt;&lt; last &lt;&lt; <span class="stringliteral">&quot;]&quot;</span> &lt;&lt; endl;</div>
<div class="line"> </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">    </div>
<div class="line"> </div>
<div class="line">    <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"> </div>
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<div class="ttc" id="asample15_8cpp_html_a20e0b4b93aca798208bbc2cda0ea1db4"><div class="ttname"><a href="sample15_8cpp.html#a20e0b4b93aca798208bbc2cda0ea1db4">fill_bvector</a></div><div class="ttdeci">static void fill_bvector(bm::bvector&lt;&gt; *bv)</div><div class="ttdef"><b>Definition:</b> <a href="sample15_8cpp_source.html#l00047">sample15.cpp:47</a></div></div>
<div class="ttc" id="asample15_8cpp_html_a840291bc02cba5474a4cb46a9b9566fe"><div class="ttname"><a href="sample15_8cpp.html#a840291bc02cba5474a4cb46a9b9566fe">main</a></div><div class="ttdeci">int main(void)</div><div class="ttdef"><b>Definition:</b> <a href="sample15_8cpp_source.html#l00060">sample15.cpp:60</a></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_a52b4259a5cc4ebd8953832c696e24f02"><div class="ttname"><a href="classbm_1_1bvector.html#a52b4259a5cc4ebd8953832c696e24f02">bm::bvector::set</a></div><div class="ttdeci">bvector&lt; Alloc &gt; &amp; set(size_type n, bool val=true)</div><div class="ttdoc">Sets bit n if val is true, clears bit n if val is false.</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l03581">bm.h:3581</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="asample15_8cpp_html_a8652d848be89c1f9b0a77327ee32fc0f"><div class="ttname"><a href="sample15_8cpp.html#a8652d848be89c1f9b0a77327ee32fc0f">MAX_VALUE</a></div><div class="ttdeci">const unsigned MAX_VALUE</div><div class="ttdef"><b>Definition:</b> <a href="sample15_8cpp_source.html#l00044">sample15.cpp:44</a></div></div>
<div class="ttc" id="aclassbm_1_1bvector_html_a08093c98bb6dfe27708357801aae7280"><div class="ttname"><a href="classbm_1_1bvector.html#a08093c98bb6dfe27708357801aae7280">bm::bvector::find</a></div><div class="ttdeci">bool find(size_type &amp;pos) const BMNOEXCEPT</div><div class="ttdoc">Finds index of first 1 bit.</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l04035">bm.h:4035</a></div></div>
<div class="ttc" id="aclassbm_1_1bvector_html_a509670c79426e6388396c7720519f5c1"><div class="ttname"><a href="classbm_1_1bvector.html#a509670c79426e6388396c7720519f5c1">bm::bvector::find_range</a></div><div class="ttdeci">bool find_range(size_type &amp;first, size_type &amp;last) const BMNOEXCEPT</div><div class="ttdoc">Finds dynamic range of bit-vector [first, last].</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l04081">bm.h:4081</a></div></div>
<div class="ttc" id="aclassbm_1_1bvector_html_a405dd9ed048c935c84a5086ec8ba3649"><div class="ttname"><a href="classbm_1_1bvector.html#a405dd9ed048c935c84a5086ec8ba3649">bm::bvector::size_type</a></div><div class="ttdeci">bm::id_t size_type</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l00117">bm.h:117</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="aclassbm_1_1bvector_html_ada8a47cb4a23e1402a7a6d728e35d50f"><div class="ttname"><a href="classbm_1_1bvector.html#ada8a47cb4a23e1402a7a6d728e35d50f">bm::bvector::find_reverse</a></div><div class="ttdeci">bool find_reverse(size_type &amp;pos) const BMNOEXCEPT</div><div class="ttdoc">Finds last index of 1 bit.</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l03978">bm.h:3978</a></div></div>
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