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<div class="title">svsample04.cpp</div>  </div>
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<p>Example how to use NULL-enabled sparse vector</p><dl class="section see"><dt>See also</dt><dd>bm::sparse_vector&lt;&gt;</dd></dl>
<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 svsample04.cpp</span></div>
<div class="line"><span class="comment">  Example how to use NULL-enabled sparse vector</span></div>
<div class="line"><span class="comment"> </span></div>
<div class="line"><span class="comment">  \sa bm::sparse_vector&lt;&gt;</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 svsample04.cpp</span></div>
<div class="line"><span class="comment">    \brief Example: sparse_vector&lt;&gt; with NULL (unset) values</span></div>
<div class="line"><span class="comment">*/</span></div>
<div class="line"> </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"><span class="preprocessor">#include &quot;<a class="code" href="bmsparsevec_8h.html">bmsparsevec.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"><span class="keyword">static</span></div>
<div class="line"><span class="keywordtype">void</span> <a name="a0"></a><a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(<span class="keyword">const</span> <a name="_a1"></a><a class="code" href="classbm_1_1sparse__vector.html">bm::sparse_vector</a>&lt;<span class="keywordtype">unsigned</span>, <a name="_a2"></a><a class="code" href="classbm_1_1bvector.html">bm::bvector&lt;&gt;</a> &gt;&amp; sv)</div>
<div class="line">{</div>
<div class="line">    <span class="keywordflow">if</span> (sv.size() == 0)</div>
<div class="line">    {</div>
<div class="line">        cout &lt;&lt; sv.size() &lt;&lt; <span class="stringliteral">&quot;: [ EMPTY ]&quot;</span> &lt;&lt; endl;</div>
<div class="line">        <span class="keywordflow">return</span>;</div>
<div class="line">    }</div>
<div class="line">    cout &lt;&lt; sv.size() &lt;&lt; <span class="stringliteral">&quot;: [ &quot;</span>;</div>
<div class="line">    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; sv.size(); ++i)</div>
<div class="line">    {</div>
<div class="line">        <span class="keywordtype">unsigned</span> v = sv.at(i);</div>
<div class="line">        <span class="keywordtype">bool</span> is_null = sv.is_null(i);</div>
<div class="line">        </div>
<div class="line">        <span class="keywordflow">if</span> (is_null)</div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;NULL&quot;</span>;</div>
<div class="line">        <span class="keywordflow">else</span></div>
<div class="line">            cout &lt;&lt; v &lt;&lt; <span class="stringliteral">&quot;&quot;</span>;</div>
<div class="line">        </div>
<div class="line">        <span class="keywordflow">if</span> (i == sv.size()-1)</div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot; ]&quot;</span>;</div>
<div class="line">        <span class="keywordflow">else</span></div>
<div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;, &quot;</span>;</div>
<div class="line">    }</div>
<div class="line">    cout &lt;&lt; endl;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> <a name="a3"></a><a class="code" href="svsample04_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">        <span class="comment">// sparse vector can support unassigned value semantics</span></div>
<div class="line">        <span class="comment">// (also known as NULL value in databases)</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        <span class="comment">// to enable this function sparse_vector&lt;&gt; needs to be constructed using</span></div>
<div class="line">        <span class="comment">// special flag ( bm::use_null )</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        <a class="code" href="classbm_1_1sparse__vector.html">bm::sparse_vector&lt;unsigned, bm::bvector&lt;&gt;</a> &gt; sv1(<a name="a4"></a><a class="code" href="group__bvector.html#ggab0835910831729c806840cd5c8f40b2ba095db184b37a1341cbbbf813a70aed79">bm::use_null</a>);</div>
<div class="line">        </div>
<div class="line">        sv1.resize(10);</div>
<div class="line">        sv1.set(2, 25);</div>
<div class="line">        sv1.set(3, 35);</div>
<div class="line">        sv1.set(7, 75);</div>
<div class="line">        </div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 10: [ NULL, NULL, 25, 35, NULL, NULL, NULL, 75, NULL, NULL ]</span></div>
<div class="line">        </div>
<div class="line">        sv1.set_null(7);</div>
<div class="line"> </div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 10: [ NULL, NULL, 25, 35, NULL, NULL, NULL, NULL, NULL, NULL ]</span></div>
<div class="line">        </div>
<div class="line">        <span class="keywordtype">unsigned</span> arr[3] = {1,2,3};</div>
<div class="line">        sv1.import(arr, 3, 9); <span class="comment">// import from a C-style array (by index 9)</span></div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 12: [ NULL, NULL, 25, 35, NULL, NULL, NULL, NULL, NULL, 1, 2, 3 ]</span></div>
<div class="line">        </div>
<div class="line">        sv1.clear(2, <span class="keyword">true</span>); <span class="comment">// clear element and set to NULL</span></div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 12: [ NULL, NULL, NULL, 35, NULL, NULL, NULL, NULL, NULL, 1, 2, 3 ]</span></div>
<div class="line"> </div>
<div class="line">        sv1.clear(2); <span class="comment">// clear element (not NULL anymore)</span></div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 12: [ NULL, NULL, 0, 35, NULL, NULL, NULL, NULL, NULL, 1, 2, 3 ]</span></div>
<div class="line"> </div>
<div class="line">        sv1.clear(3); <span class="comment">// clear element (it stays NOT NULL)</span></div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 12: [ NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL, 1, 2, 3 ]</span></div>
<div class="line"> </div>
<div class="line">        sv1.clear();</div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 0: [ EMPTY ]</span></div>
<div class="line">        </div>
<div class="line">        sv1.resize(3);</div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 3: [ NULL, NULL, NULL ]</span></div>
<div class="line">        </div>
<div class="line">        sv1.push_back(10);</div>
<div class="line">        sv1.push_back(20);</div>
<div class="line">        </div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 5: [ NULL, NULL, NULL, 10, 20 ]</span></div>
<div class="line"> </div>
<div class="line">        </div>
<div class="line">        <span class="comment">// construct not-null-able sparse vector</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        <a class="code" href="classbm_1_1sparse__vector.html">bm::sparse_vector&lt;unsigned, bm::bvector&lt;&gt;</a> &gt; sv2;</div>
<div class="line">        sv2.<a name="a5"></a><a class="code" href="classbm_1_1sparse__vector.html#a2f8aadebd1cfecd8e70fc771dbbd748d">push_back</a>(100);</div>
<div class="line">        sv2.<a class="code" href="classbm_1_1sparse__vector.html#a2f8aadebd1cfecd8e70fc771dbbd748d">push_back</a>(200);</div>
<div class="line">        </div>
<div class="line">        sv1.join(sv2);  <span class="comment">// merge two vectors together</span></div>
<div class="line">        </div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 5: [ 100, 200, NULL, 10, 20 ]</span></div>
<div class="line">        </div>
<div class="line">        <span class="comment">// construct another NULL-able vector for another join</span></div>
<div class="line">        <a class="code" href="classbm_1_1sparse__vector.html">bm::sparse_vector&lt;unsigned, bm::bvector&lt;&gt;</a> &gt; sv3(<a class="code" href="group__bvector.html#ggab0835910831729c806840cd5c8f40b2ba095db184b37a1341cbbbf813a70aed79">bm::use_null</a>);</div>
<div class="line">        sv3.resize(9);</div>
<div class="line">        sv3.push_back(300);</div>
<div class="line">        </div>
<div class="line">        <span class="comment">// this join will fully respect the NULL flags assigned in both sparse vectors</span></div>
<div class="line">        sv1.join(sv3);</div>
<div class="line">        </div>
<div class="line">        <a class="code" href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a>(sv1); <span class="comment">// 10: [ 100, 200, NULL, 10, 20, NULL, NULL, NULL, NULL, 300 ]</span></div>
<div class="line"> </div>
<div class="line">        <span class="comment">// traverse and print the non-NULL values</span></div>
<div class="line">        <span class="comment">// using bit-vector of assigned values</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        <span class="comment">//          [0] = 100, [1] = 200, [3] = 10, [4] = 20, [9] = 300</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        {</div>
<div class="line">            <span class="keyword">const</span> <a class="code" href="classbm_1_1bvector.html">bm::bvector&lt;&gt;</a>* bv_non_null = sv1.get_null_bvector();</div>
<div class="line">            <span class="keywordflow">if</span> (bv_non_null)</div>
<div class="line">            {</div>
<div class="line">                <a name="_a6"></a><a class="code" href="classbm_1_1bvector_1_1enumerator.html">bm::bvector&lt;&gt;::enumerator</a> en = bv_non_null-&gt;<a name="a7"></a><a class="code" href="classbm_1_1bvector.html#a86b939f3aed555dc073e8c26e9efea71">first</a>();</div>
<div class="line"> </div>
<div class="line">                <span class="keywordflow">for</span> (; en.<a name="a8"></a><a class="code" href="classbm_1_1bvector_1_1iterator__base.html#a3f6af7f5b46c0219b28916187d302c43">valid</a>(); ++en)</div>
<div class="line">                {</div>
<div class="line">                    <span class="keywordtype">unsigned</span> idx = *en;</div>
<div class="line">                    <span class="keywordtype">unsigned</span> v = sv1[idx];</div>
<div class="line">                    std::cout &lt;&lt; <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; idx &lt;&lt; <span class="stringliteral">&quot;] = &quot;</span> &lt;&lt; v &lt;&lt; <span class="stringliteral">&quot;, &quot;</span>;</div>
<div class="line">                }</div>
<div class="line">                std::cout &lt;&lt; endl;</div>
<div class="line">            }</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line">        <span class="comment">// decode sparse_vector with NULL values</span></div>
<div class="line">        <span class="comment">// decode ignores NULLs (in our case replaces values with &#39;0s&#39;</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        {</div>
<div class="line">            std::vector&lt;unsigned&gt; v1(sv1.size());</div>
<div class="line">            sv1.decode(&amp;v1[0], 0, sv1.size()); <span class="comment">// extract elements starting from 0</span></div>
<div class="line">            </div>
<div class="line">            <span class="comment">// 100,200,0,10,20,0,0,0,0,300,</span></div>
<div class="line">            <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; v1.size(); ++i)</div>
<div class="line">            {</div>
<div class="line">                cout &lt;&lt; v1[i] &lt;&lt; <span class="stringliteral">&quot;,&quot;</span>;</div>
<div class="line">            }</div>
<div class="line">            cout &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">    <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"> </div>
</div><!-- fragment --> </div><!-- contents -->
<div class="ttc" id="aclassbm_1_1sparse__vector_html"><div class="ttname"><a href="classbm_1_1sparse__vector.html">bm::sparse_vector</a></div><div class="ttdoc">sparse vector with runtime compression using bit transposition method</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec_8h_source.html#l00081">bmsparsevec.h:81</a></div></div>
<div class="ttc" id="abmsparsevec_8h_html"><div class="ttname"><a href="bmsparsevec_8h.html">bmsparsevec.h</a></div><div class="ttdoc">Sparse constainer sparse_vector&lt;&gt; for integer types using bit-transposition transform.</div></div>
<div class="ttc" id="aclassbm_1_1bvector_1_1enumerator_html"><div class="ttname"><a href="classbm_1_1bvector_1_1enumerator.html">bm::bvector::enumerator</a></div><div class="ttdoc">Constant iterator designed to enumerate &quot;ON&quot; bits.</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l00599">bm.h:599</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="agroup__bvector_html_ggab0835910831729c806840cd5c8f40b2ba095db184b37a1341cbbbf813a70aed79"><div class="ttname"><a href="group__bvector.html#ggab0835910831729c806840cd5c8f40b2ba095db184b37a1341cbbbf813a70aed79">bm::use_null</a></div><div class="ttdeci">@ use_null</div><div class="ttdoc">support &quot;non-assigned&quot; or &quot;NULL&quot; logic</div><div class="ttdef"><b>Definition:</b> <a href="bmconst_8h_source.html#l00215">bmconst.h:215</a></div></div>
<div class="ttc" id="aclassbm_1_1bvector_1_1iterator__base_html_a3f6af7f5b46c0219b28916187d302c43"><div class="ttname"><a href="classbm_1_1bvector_1_1iterator__base.html#a3f6af7f5b46c0219b28916187d302c43">bm::bvector::iterator_base::valid</a></div><div class="ttdeci">bool valid() const BMNOEXCEPT</div><div class="ttdoc">Checks if iterator is still valid. Analog of != 0 comparison for pointers.</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l00280">bm.h:280</a></div></div>
<div class="ttc" id="asvsample04_8cpp_html_a840291bc02cba5474a4cb46a9b9566fe"><div class="ttname"><a href="svsample04_8cpp.html#a840291bc02cba5474a4cb46a9b9566fe">main</a></div><div class="ttdeci">int main(void)</div><div class="ttdef"><b>Definition:</b> <a href="svsample04_8cpp_source.html#l00064">svsample04.cpp:64</a></div></div>
<div class="ttc" id="aclassbm_1_1sparse__vector_html_a2f8aadebd1cfecd8e70fc771dbbd748d"><div class="ttname"><a href="classbm_1_1sparse__vector.html#a2f8aadebd1cfecd8e70fc771dbbd748d">bm::sparse_vector::push_back</a></div><div class="ttdeci">void push_back(value_type v)</div><div class="ttdoc">push value back into vector</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec_8h_source.html#l01498">bmsparsevec.h:1498</a></div></div>
<div class="ttc" id="arscsample01_8cpp_html_a54f5fe8b2249df4ed044724dae4bf06d"><div class="ttname"><a href="rscsample01_8cpp.html#a54f5fe8b2249df4ed044724dae4bf06d">print_svector</a></div><div class="ttdeci">void print_svector(const SV &amp;sv, bool show_nulls=false)</div><div class="ttdef"><b>Definition:</b> <a href="rscsample01_8cpp_source.html#l00056">rscsample01.cpp:56</a></div></div>
<div class="ttc" id="aclassbm_1_1bvector_html_a86b939f3aed555dc073e8c26e9efea71"><div class="ttname"><a href="classbm_1_1bvector.html#a86b939f3aed555dc073e8c26e9efea71">bm::bvector::first</a></div><div class="ttdeci">enumerator first() const</div><div class="ttdoc">Returns enumerator pointing on the first non-zero bit.</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l01770">bm.h:1770</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>
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