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<div class="title">svsample08.cpp</div>  </div>
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<p>Example of how to serialize bm::sparse_vector&lt;&gt; container</p><dl class="section see"><dt>See also</dt><dd><a class="el" href="classbm_1_1sparse__vector.html" title="sparse vector with runtime compression using bit transposition method">bm::sparse_vector</a> </dd>
<dd>
<a class="el" href="classbm_1_1sparse__vector__deserializer.html" title="sparse vector de-serializer">bm::sparse_vector_deserializer</a> </dd>
<dd>
<a class="el" href="structbm_1_1sparse__vector__serial__layout.html" title="layout class for serialization buffer structure">bm::sparse_vector_serial_layout</a> </dd>
<dd>
<a class="el" href="classbm_1_1sparse__vector__serializer.html">bm::sparse_vector_serializer</a></dd></dl>
<div class="fragment"><div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment">Copyright(c) 2002-2019 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 svsample08.cpp</span></div>
<div class="line"><span class="comment">  Example of how to serialize bm::sparse_vector&lt;&gt; container</span></div>
<div class="line"><span class="comment"> </span></div>
<div class="line"><span class="comment">  \sa bm::sparse_vector</span></div>
<div class="line"><span class="comment">  \sa bm::sparse_vector_deserializer</span></div>
<div class="line"><span class="comment">  \sa bm::sparse_vector_serial_layout</span></div>
<div class="line"><span class="comment">  \sa bm::sparse_vector_serializer</span></div>
<div class="line"><span class="comment"></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 svsample08.cpp</span></div>
<div class="line"><span class="comment">    \brief Example: sparse_vector&lt;&gt; selective de-serialization (gather)</span></div>
<div class="line"><span class="comment">    and range deserialization</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">    @sa strsvsample05.cpp</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"><span class="preprocessor">#include &quot;<a class="code" href="bmsparsevec__serial_8h.html">bmsparsevec_serial.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">using namespace </span>std;</div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">/// Print sparse vector content</span></div>
<div class="line"><span class="comment"></span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> SV&gt; <span class="keywordtype">void</span> <a name="a0"></a><a class="code" href="svsample08_8cpp.html#ab6a4303cab1279938d0d2a2d74645336">PrintSV</a>(<span class="keyword">const</span> SV&amp; sv)</div>
<div class="line">{</div>
<div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;size() = &quot;</span> &lt;&lt; sv.size() &lt;&lt; <span class="stringliteral">&quot; : &quot;</span>;</div>
<div class="line">    <span class="keyword">auto</span> it = sv.begin(); <span class="keyword">auto</span> it_end = sv.end();</div>
<div class="line">    <span class="keywordflow">for</span> (; it != it_end; ++it)</div>
<div class="line">    {</div>
<div class="line">        <span class="keywordflow">if</span> (it.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; *it;</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="keyword">typedef</span> <a name="_a1"></a><a class="code" href="classbm_1_1sparse__vector.html">bm::sparse_vector&lt;unsigned, bm::bvector&lt;&gt;</a> &gt; <a name="a2"></a><a class="code" href="svsample08_8cpp.html#a0d169ec2ee5a4e5265f850f56a3b3452">svector_u32</a>;</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> <a name="a3"></a><a class="code" href="svsample08_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="_a4"></a><a class="code" href="classbm_1_1sparse__vector.html">svector_u32</a> sv1(<a name="a5"></a><a class="code" href="group__bvector.html#ggab0835910831729c806840cd5c8f40b2ba095db184b37a1341cbbbf813a70aed79">bm::use_null</a>);</div>
<div class="line">        <a class="code" href="classbm_1_1sparse__vector.html">svector_u32</a> sv2(<a class="code" href="group__bvector.html#ggab0835910831729c806840cd5c8f40b2ba095db184b37a1341cbbbf813a70aed79">bm::use_null</a>);</div>
<div class="line"> </div>
<div class="line">        <span class="comment">// add sample data using back insert iterator</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        {</div>
<div class="line">            <span class="keyword">auto</span> bit = sv1.get_back_inserter();</div>
<div class="line">            bit = 10;</div>
<div class="line">            bit = 11;</div>
<div class="line">            bit.add_null();</div>
<div class="line">            bit = 13;</div>
<div class="line">            bit = 14;</div>
<div class="line">            bit.add_null(2);</div>
<div class="line">            bit = 256;</div>
<div class="line">            bit.flush();</div>
<div class="line">        }</div>
<div class="line">        <a class="code" href="svsample08_8cpp.html#ab6a4303cab1279938d0d2a2d74645336">PrintSV</a>(sv1); <span class="comment">// size() = 8 : 10, 11, NULL, 13, 14, NULL, NULL, 256,</span></div>
<div class="line"> </div>
<div class="line">        <span class="comment">// serialize sparse vector</span></div>
<div class="line">        <a name="_a6"></a><a class="code" href="structbm_1_1sparse__vector__serial__layout.html">bm::sparse_vector_serial_layout&lt;svector_u32&gt;</a> sv_lay;</div>
<div class="line">        {</div>
<div class="line">            <a name="a7"></a><a class="code" href="bm_8h.html#ad9736d9521d713fa5d48859aa720bfdd">BM_DECLARE_TEMP_BLOCK</a>(tb)</div>
<div class="line">            <span class="comment">// optimize memory allocation of sparse vector</span></div>
<div class="line">            sv1.optimize(tb);</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line">            <span class="comment">// construct a serializer utility class, setup serialization parameters</span></div>
<div class="line">            <span class="comment">//</span></div>
<div class="line">            <span class="comment">// please note, use of &quot;set_bookmarks()&quot; to enable fast range</span></div>
<div class="line">            <span class="comment">// deserialization. Bookmarks somewhat increase the BLOB size but allow</span></div>
<div class="line">            <span class="comment">// more effeiciently skip parts which we would not need (paging) and</span></div>
<div class="line">            <span class="comment">// avoid decompression of blocks we would never need</span></div>
<div class="line">            <span class="comment">//</span></div>
<div class="line">            <span class="comment">// This example sets &quot;64&quot; as a bookmarks parameter, but you have to</span></div>
<div class="line">            <span class="comment">// experiment with what works for you, between 4 and 512</span></div>
<div class="line">            <span class="comment">//</span></div>
<div class="line">            <span class="comment">// Each block corresponds to 64K vector element</span></div>
<div class="line">            <span class="comment">// making bookmarks after each block does not make much sense</span></div>
<div class="line">            <span class="comment">// because decode is reasonably fast and some residual throw away</span></div>
<div class="line">            <span class="comment">// is usually ok.</span></div>
<div class="line">            <span class="comment">//</span></div>
<div class="line"> </div>
<div class="line">            <a name="_a8"></a><a class="code" href="classbm_1_1sparse__vector__serializer.html">bm::sparse_vector_serializer&lt;svector_u32&gt;</a> sv_serializer;</div>
<div class="line">            sv_serializer.<a name="a9"></a><a class="code" href="classbm_1_1sparse__vector__serializer.html#a1f2c7b4052cafe17691dac1228bc284a">set_bookmarks</a>(<span class="keyword">true</span>, 64);</div>
<div class="line"> </div>
<div class="line">            <span class="comment">// serialization, creates a compressed BLOB</span></div>
<div class="line">            sv_serializer.<a name="a10"></a><a class="code" href="classbm_1_1sparse__vector__serializer.html#ab5708d236c5fba3fda5d55683321b8f3">serialize</a>(sv1, sv_lay);</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        <span class="comment">// get serialization pointer</span></div>
<div class="line">        <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* buf = sv_lay.<a name="a11"></a><a class="code" href="structbm_1_1sparse__vector__serial__layout.html#a294902a56855b5bde661b07bba697ab2">buf</a>();</div>
<div class="line"> </div>
<div class="line">        <span class="comment">// instantiate the deserializer object to do all multiple</span></div>
<div class="line">        <span class="comment">// deserialization operations (faster)</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        <a name="_a12"></a><a class="code" href="classbm_1_1sparse__vector__deserializer.html">bm::sparse_vector_deserializer&lt;svector_u32&gt;</a> sv_deserial;</div>
<div class="line"> </div>
<div class="line">        <span class="comment">// Case 1:</span></div>
<div class="line">        <span class="comment">// Here we define de-serialization indexes as a bit-vector (mask)</span></div>
<div class="line">        <span class="comment">// so deserializer gathers only elements selected by the bit-vector</span></div>
<div class="line">        <span class="comment">// all vector elements not set in the gather vector will be 0 (or NULL)</span></div>
<div class="line">        <span class="comment">//</span></div>
<div class="line">        {</div>
<div class="line">            <a name="_a13"></a><a class="code" href="classbm_1_1bvector.html">svector_u32::bvector_type</a> bv_mask;</div>
<div class="line">            bv_mask.<a name="a14"></a><a class="code" href="classbm_1_1bvector.html#a52b4259a5cc4ebd8953832c696e24f02">set</a>(0);</div>
<div class="line">            bv_mask.<a class="code" href="classbm_1_1bvector.html#a52b4259a5cc4ebd8953832c696e24f02">set</a>(1);</div>
<div class="line">            sv_deserial.<a name="a15"></a><a class="code" href="classbm_1_1sparse__vector__deserializer.html#afbc1270f03b82203bdf66e2abedcf34a">deserialize</a>(sv2, buf, bv_mask);</div>
<div class="line">        }</div>
<div class="line">        <a class="code" href="svsample08_8cpp.html#ab6a4303cab1279938d0d2a2d74645336">PrintSV</a>(sv2); <span class="comment">// size() = 8 : 10, 11, NULL, 0, 0, NULL, NULL, 0,</span></div>
<div class="line"> </div>
<div class="line">        <span class="comment">// Case 2:</span></div>
<div class="line">        <span class="comment">// Here we define de-serialization indexes as a closed range [1..4]</span></div>
<div class="line">        <span class="comment">// It is an equivalent of setting selection bits in the mask vector</span></div>
<div class="line">        <span class="comment">// but defines the intent more clearly and works faster</span></div>
<div class="line">        {</div>
<div class="line">            sv_deserial.<a name="a16"></a><a class="code" href="classbm_1_1sparse__vector__deserializer.html#a73c7a232fa75cb190ed86b0ee92e2c80">deserialize_range</a>(sv2, buf, 1, 4);</div>
<div class="line">        }</div>
<div class="line">        <a class="code" href="svsample08_8cpp.html#ab6a4303cab1279938d0d2a2d74645336">PrintSV</a>(sv2); <span class="comment">// size() = 8 : 0, 11, NULL, 13, 14, NULL, NULL, 0,</span></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"> </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__deserializer_html"><div class="ttname"><a href="classbm_1_1sparse__vector__deserializer.html">bm::sparse_vector_deserializer</a></div><div class="ttdoc">sparse vector de-serializer</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec__serial_8h_source.html#l00223">bmsparsevec_serial.h:223</a></div></div>
<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="asvsample08_8cpp_html_ab6a4303cab1279938d0d2a2d74645336"><div class="ttname"><a href="svsample08_8cpp.html#ab6a4303cab1279938d0d2a2d74645336">PrintSV</a></div><div class="ttdeci">void PrintSV(const SV &amp;sv)</div><div class="ttdoc">Print sparse vector content.</div><div class="ttdef"><b>Definition:</b> <a href="svsample08_8cpp_source.html#l00046">svsample08.cpp:46</a></div></div>
<div class="ttc" id="abm_8h_html_ad9736d9521d713fa5d48859aa720bfdd"><div class="ttname"><a href="bm_8h.html#ad9736d9521d713fa5d48859aa720bfdd">BM_DECLARE_TEMP_BLOCK</a></div><div class="ttdeci">#define BM_DECLARE_TEMP_BLOCK(x)</div><div class="ttdef"><b>Definition:</b> <a href="bm_8h_source.html#l00047">bm.h:47</a></div></div>
<div class="ttc" id="astructbm_1_1sparse__vector__serial__layout_html_a294902a56855b5bde661b07bba697ab2"><div class="ttname"><a href="structbm_1_1sparse__vector__serial__layout.html#a294902a56855b5bde661b07bba697ab2">bm::sparse_vector_serial_layout::buf</a></div><div class="ttdeci">const unsigned char * buf() const</div><div class="ttdoc">Return serialization buffer pointer.</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec__serial_8h_source.html#l00106">bmsparsevec_serial.h:106</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="abmsparsevec__serial_8h_html"><div class="ttname"><a href="bmsparsevec__serial_8h.html">bmsparsevec_serial.h</a></div><div class="ttdoc">Serialization for sparse_vector&lt;&gt;</div></div>
<div class="ttc" id="astructbm_1_1sparse__vector__serial__layout_html"><div class="ttname"><a href="structbm_1_1sparse__vector__serial__layout.html">bm::sparse_vector_serial_layout</a></div><div class="ttdoc">layout class for serialization buffer structure</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec__serial_8h_source.html#l00057">bmsparsevec_serial.h:57</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_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_1sparse__vector__serializer_html_ab5708d236c5fba3fda5d55683321b8f3"><div class="ttname"><a href="classbm_1_1sparse__vector__serializer.html#ab5708d236c5fba3fda5d55683321b8f3">bm::sparse_vector_serializer::serialize</a></div><div class="ttdeci">void serialize(const SV &amp;sv, sparse_vector_serial_layout&lt; SV &gt; &amp;sv_layout)</div><div class="ttdoc">Serialize sparse vector into a memory buffer(s) structure.</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec__serial_8h_source.html#l00628">bmsparsevec_serial.h:628</a></div></div>
<div class="ttc" id="aclassbm_1_1sparse__vector__deserializer_html_afbc1270f03b82203bdf66e2abedcf34a"><div class="ttname"><a href="classbm_1_1sparse__vector__deserializer.html#afbc1270f03b82203bdf66e2abedcf34a">bm::sparse_vector_deserializer::deserialize</a></div><div class="ttdeci">void deserialize(SV &amp;sv, const unsigned char *buf)</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec__serial_8h_source.html#l00243">bmsparsevec_serial.h:243</a></div></div>
<div class="ttc" id="asvsample08_8cpp_html_a840291bc02cba5474a4cb46a9b9566fe"><div class="ttname"><a href="svsample08_8cpp.html#a840291bc02cba5474a4cb46a9b9566fe">main</a></div><div class="ttdeci">int main(void)</div><div class="ttdef"><b>Definition:</b> <a href="svsample08_8cpp_source.html#l00063">svsample08.cpp:63</a></div></div>
<div class="ttc" id="aclassbm_1_1sparse__vector__serializer_html_a1f2c7b4052cafe17691dac1228bc284a"><div class="ttname"><a href="classbm_1_1sparse__vector__serializer.html#a1f2c7b4052cafe17691dac1228bc284a">bm::sparse_vector_serializer::set_bookmarks</a></div><div class="ttdeci">void set_bookmarks(bool enable, unsigned bm_interval=256)</div><div class="ttdoc">Add skip-markers for faster range deserialization.</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec__serial_8h_source.html#l00183">bmsparsevec_serial.h:183</a></div></div>
<div class="ttc" id="asvsample08_8cpp_html_a0d169ec2ee5a4e5265f850f56a3b3452"><div class="ttname"><a href="svsample08_8cpp.html#a0d169ec2ee5a4e5265f850f56a3b3452">svector_u32</a></div><div class="ttdeci">bm::sparse_vector&lt; unsigned, bm::bvector&lt;&gt; &gt; svector_u32</div><div class="ttdef"><b>Definition:</b> <a href="svsample08_8cpp_source.html#l00061">svsample08.cpp:61</a></div></div>
<div class="ttc" id="aclassbm_1_1sparse__vector__deserializer_html_a73c7a232fa75cb190ed86b0ee92e2c80"><div class="ttname"><a href="classbm_1_1sparse__vector__deserializer.html#a73c7a232fa75cb190ed86b0ee92e2c80">bm::sparse_vector_deserializer::deserialize_range</a></div><div class="ttdeci">void deserialize_range(SV &amp;sv, const unsigned char *buf, size_type from, size_type to)</div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec__serial_8h_source.html#l00788">bmsparsevec_serial.h:788</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_1sparse__vector__serializer_html"><div class="ttname"><a href="classbm_1_1sparse__vector__serializer.html">bm::sparse_vector_serializer</a></div><div class="ttdef"><b>Definition:</b> <a href="bmsparsevec__serial_8h_source.html#l00160">bmsparsevec_serial.h:160</a></div></div>
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