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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<h1>sample7.cpp</h1><p>This example demonstrates using of memory save mode of bitset operations.</p>
<p>For more information please visit: <a href="http://bmagic.sourceforge.net">http://bmagic.sourceforge.net</a></p>
<div class="fragment"><pre class="fragment"><span class="comment">/*</span>
<span class="comment">Copyright(c) 2002-2005 Anatoliy Kuznetsov(anatoliy_kuznetsov at yahoo.com)</span>
<span class="comment"></span>
<span class="comment">Permission is hereby granted, free of charge, to any person </span>
<span class="comment">obtaining a copy of this software and associated documentation </span>
<span class="comment">files (the &quot;Software&quot;), to deal in the Software without restriction, </span>
<span class="comment">including without limitation the rights to use, copy, modify, merge, </span>
<span class="comment">publish, distribute, sublicense, and/or sell copies of the Software, </span>
<span class="comment">and to permit persons to whom the Software is furnished to do so, </span>
<span class="comment">subject to the following conditions:</span>
<span class="comment"></span>
<span class="comment">The above copyright notice and this permission notice shall be included </span>
<span class="comment">in all copies or substantial portions of the Software.</span>
<span class="comment"></span>
<span class="comment">THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, </span>
<span class="comment">EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES </span>
<span class="comment">OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. </span>
<span class="comment">IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, </span>
<span class="comment">DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, </span>
<span class="comment">ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR </span>
<span class="comment">OTHER DEALINGS IN THE SOFTWARE.</span>
<span class="comment">*/</span>
<span class="comment"></span>
<span class="comment">/*! @example sample7.cpp</span>
<span class="comment"> This example demonstrates using of memory save mode of bitset operations.</span>
<span class="comment"></span>
<span class="comment">For more information please visit:  http://bmagic.sourceforge.net</span>
<span class="comment"></span>
<span class="comment">*/</span>
<span class="comment"></span>
<span class="comment">/*! @file</span>
<span class="comment">    @ingroup mset</span>
<span class="comment">*/</span>

<span class="preprocessor">#include &lt;iostream&gt;</span>
<span class="preprocessor">#include &lt;stdlib.h&gt;</span>
<span class="preprocessor">#include &lt;stdio.h&gt;</span>
<span class="preprocessor">#include &lt;time.h&gt;</span>


<span class="comment">// BM library version 3.1.3 and later can keep internal bit flags in pointers.</span>
<span class="comment">// This is efficient but not completely portable hack. </span>
<span class="comment">// For compatibility it can be disabled it by defining BM_DISBALE_BIT_IN_PTR.</span>
<span class="comment">// If you do not disable bits in pointer the second template parameter of bvector</span>
<span class="comment">// is simply ignored and portion of this example is becoming irrelevant.</span>
<span class="preprocessor">#define BM_DISBALE_BIT_IN_PTR</span>
<span class="preprocessor"></span><span class="preprocessor">#include &quot;<a class="code" href="a00088.html">bm.h</a>&quot;</span>

<span class="keyword">using namespace </span>std;

<span class="comment">// Customized bitvector uses standard memory allocator and uses</span>
<span class="comment">// an alternative implementation of internal set. Saves memory when we </span>
<span class="comment">// work with sparse or dense bitsets.</span>
<span class="keyword">typedef</span> <a name="_a0"></a><a class="code" href="a00044.html" title="bitvector with runtime compression of bits.">bm::bvector</a>&lt;<a name="_a1"></a><a class="code" href="a00074.html" title="BM style allocator adapter.">bm::standard_allocator</a>, 
                    <a name="_a2"></a><a class="code" href="a00075.html" title="Template class implements memory saving set functionality.">bm::miniset&lt;bm::block_allocator, bm::set_total_blocks&gt;</a> &gt; <a class="code" href="a00044.html" title="bitvector with runtime compression of bits.">bvect</a>;


<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <a name="a3"></a><a class="code" href="a00113.html#a2508b4033cfced61642ad9358d67dd2a">setscount</a> = 10000;
<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <a name="a4"></a><a class="code" href="a00113.html#a0be29ed34efa43589f6c14e4e9f5dbc4">randombits</a> = 150;
<span class="keyword">const</span> <span class="keywordtype">unsigned</span> <a name="a5"></a><a class="code" href="a00113.html#a1b239e2f0f190ff4df0b359f8b601644">maxbit</a> = 100000000;

<a class="code" href="a00044.html" title="bitvector with runtime compression of bits.">bvect</a>*  <a name="a6"></a><a class="code" href="a00113.html#aef9a3bedb74930ffc25d49f7ac4ba1eb">bitsets</a>[<a class="code" href="a00113.html#a2508b4033cfced61642ad9358d67dd2a">setscount</a>];

<span class="comment">// ---------------------------------------------------------</span>

<span class="keywordtype">void</span> <a name="a7"></a><a class="code" href="a00113.html#adb34fb3c04bbc949324b069298b6ad60">CreateSets</a>()
{
    <span class="keywordtype">unsigned</span> mu = 0;
    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; <a class="code" href="a00113.html#a2508b4033cfced61642ad9358d67dd2a">setscount</a>; ++i)
    {
        <span class="keywordflow">if</span> ((i % 100) == 0) { cout &lt;&lt; <span class="stringliteral">&quot;.&quot;</span>; cout.flush(); }
        <span class="comment">// create bitvector using in GAP mode using an alternative</span>
        <span class="comment">// GAP levels table (minimalistic).</span>
        bitsets[i] = 
            <span class="keyword">new</span> <a name="a8"></a><a class="code" href="a00112.html#ac07bb102df543a0c581493c5f35b2129">bvect</a>(<a name="a9"></a><a class="code" href="a00119.html#ggad0b87b3b7292383a864d27feaf1c9effa7fe09d1d7c62a813db922c396c0cbc9c" title="GAP compression is ON.">bm::BM_GAP</a>, <a name="_a10"></a><a class="code" href="a00068.html" title="Alternative GAP lengths table. Good for for memory saver mode and very sparse bitsets...">bm::gap_len_table_min&lt;true&gt;::_len</a>, <a class="code" href="a00113.html#a1b239e2f0f190ff4df0b359f8b601644">maxbit</a>);
        <a class="code" href="a00044.html" title="bitvector with runtime compression of bits.">bvect</a>&amp; bv = *bitsets[i];
        <a name="_a11"></a><a class="code" href="a00086.html" title="Statistical information about bitset&amp;#39;s memory allocation details.">bvect::statistics</a> st;
        bv.<a name="a12"></a><a class="code" href="a00044.html#a1eaaac76a97b9eb1d3c11f21cf9385ac" title="Calculates bitvector statistics.">calc_stat</a>(&amp;st);
        mu += st.<a name="a13"></a><a class="code" href="a00043.html#ad3b2190eb4afe24ecd56323cbc0a7666" title="Memory used by bitvector including temp and service blocks.">memory_used</a>;
    }
    cout &lt;&lt; endl &lt;&lt; <span class="stringliteral">&quot;Created &quot;</span> &lt;&lt; setscount &lt;&lt; <span class="stringliteral">&quot; sets.&quot;</span> &lt;&lt; endl; 
    cout &lt;&lt; <span class="stringliteral">&quot;Used &quot;</span> &lt;&lt; mu / (1024*1024)&lt;&lt; <span class="stringliteral">&quot; MB.&quot;</span> &lt;&lt; endl;
}

<span class="comment">// ---------------------------------------------------------</span>

<span class="keywordtype">void</span> <a name="a14"></a><a class="code" href="a00113.html#a8b36b27c3c40d9e559c078673a3a4dc9">FillSets</a>()
{
    <span class="keywordtype">unsigned</span> mu, bit_blocks, gap_blocks;
    cout &lt;&lt; <span class="stringliteral">&quot;Filling sets...&quot;</span>;
    mu = bit_blocks = gap_blocks = 0;
    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; <a class="code" href="a00113.html#a2508b4033cfced61642ad9358d67dd2a">setscount</a>; ++i)
    {
        <span class="keywordflow">if</span> ((i % 100) == 0) { cout &lt;&lt; <span class="stringliteral">&quot;.&quot;</span>; cout.flush(); }
        <span class="keywordflow">if</span> ((i % 3) == 0) <span class="keywordflow">continue</span>;
        <a class="code" href="a00044.html" title="bitvector with runtime compression of bits.">bvect</a>&amp; bv = *bitsets[i];
        <span class="keywordtype">unsigned</span> bn = 0;
        <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> j = 0; j &lt; <a class="code" href="a00113.html#a0be29ed34efa43589f6c14e4e9f5dbc4">randombits</a>; j+=3)
        {
            bn += (<a class="code" href="a00113.html#a1b239e2f0f190ff4df0b359f8b601644">maxbit</a> / randombits) + rand() % 10;
            <span class="keywordflow">if</span> (bn &gt; <a class="code" href="a00113.html#a1b239e2f0f190ff4df0b359f8b601644">maxbit</a>) bn = rand() % <a class="code" href="a00113.html#a1b239e2f0f190ff4df0b359f8b601644">maxbit</a>;

            bv[bn] = <span class="keyword">true</span>;
            bv[bn+1] = <span class="keyword">true</span>;
            bv[bn+2] = <span class="keyword">true</span>;
        }
        <a class="code" href="a00086.html" title="Statistical information about bitset&amp;#39;s memory allocation details.">bvect::statistics</a> st;
        bv.<a class="code" href="a00044.html#a1eaaac76a97b9eb1d3c11f21cf9385ac" title="Calculates bitvector statistics.">calc_stat</a>(&amp;st);
        mu += st.<a class="code" href="a00043.html#ad3b2190eb4afe24ecd56323cbc0a7666" title="Memory used by bitvector including temp and service blocks.">memory_used</a>;
        bit_blocks += st.<a name="a15"></a><a class="code" href="a00043.html#a4ec8ba190b4ba31c431c008402881c62" title="Number of bit blocks.">bit_blocks</a>;
        gap_blocks += st.<a name="a16"></a><a class="code" href="a00043.html#a4dcfd64e9ab0be5472e3c2b04e551f81" title="Number of GAP blocks.">gap_blocks</a>;
    }
    cout &lt;&lt; endl &lt;&lt; <span class="stringliteral">&quot;Used &quot;</span> &lt;&lt; mu / (1024*1024)&lt;&lt; <span class="stringliteral">&quot; MB.&quot;</span> &lt;&lt; endl;

    cout &lt;&lt; <span class="stringliteral">&quot;BIT Blocks=&quot;</span> &lt;&lt; bit_blocks &lt;&lt; endl;
    cout &lt;&lt; <span class="stringliteral">&quot;GAP Blocks=&quot;</span> &lt;&lt; gap_blocks &lt;&lt; endl;
}

<span class="comment">// ---------------------------------------------------------</span>

<span class="keywordtype">void</span> <a name="a17"></a><a class="code" href="a00113.html#a5cb27a7766b9e7c1ea79b2741714b404">EnumerateSets</a>()
{
    cout &lt;&lt; <span class="stringliteral">&quot;Enumerating sets...&quot;</span>;
    <span class="keywordtype">unsigned</span> bitcnt = 0;
    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; setscount; ++i)
    {
        <span class="keywordflow">if</span> ((i % 100) == 0) { cout &lt;&lt; <span class="stringliteral">&quot;.&quot;</span>; cout.flush(); }
        <a class="code" href="a00044.html" title="bitvector with runtime compression of bits.">bvect</a>&amp; bv = *bitsets[i];

        <a name="_a18"></a><a class="code" href="a00063.html" title="Constant input iterator designed to enumerate &amp;quot;ON&amp;quot; bits.">bvect::enumerator</a> en = bv.<a name="a19"></a><a class="code" href="a00044.html#aad48c661f843e32c9893438a6f27a8f0" title="Returns enumerator pointing on the first non-zero bit.">first</a>();
        <a class="code" href="a00063.html" title="Constant input iterator designed to enumerate &amp;quot;ON&amp;quot; bits.">bvect::enumerator</a> en_end = bv.<a name="a20"></a><a class="code" href="a00044.html#a2c6e522f858fdc466765d2c0f269f590" title="Returns enumerator pointing on the next bit after the last.">end</a>();

        <span class="keywordflow">for</span> (;en &lt; en_end; ++en)
        {
            ++bitcnt;
        }
    }
    cout &lt;&lt; endl &lt;&lt; bitcnt &lt;&lt; endl;
}

<span class="comment">// ---------------------------------------------------------</span>

<span class="keywordtype">void</span> <a name="a21"></a><a class="code" href="a00113.html#aa777f579687be6096cdbb8b2d70baf6e">DestroySets</a>()
{
    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; setscount; ++i)
    {
        <span class="keyword">delete</span> bitsets[i];
    }
}

<span class="comment">// ---------------------------------------------------------</span>

<span class="keywordtype">void</span> <a name="a22"></a><a class="code" href="a00113.html#a1bdd608971ec7ea3d5c76cf21c7d92e7">OrSets</a>()
{
    <a class="code" href="a00044.html" title="bitvector with runtime compression of bits.">bvect</a> res;
    cout &lt;&lt; <span class="stringliteral">&quot;Calculating Or...&quot;</span>;
    <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; setscount; ++i)
    {
        <span class="keywordflow">if</span> ((i % 100) == 0) { cout &lt;&lt; <span class="stringliteral">&quot;.&quot;</span>; cout.flush(); }
        <span class="keyword">const</span> <a class="code" href="a00044.html" title="bitvector with runtime compression of bits.">bvect</a>&amp; bv = *bitsets[i];

        res |= bv;
    }
    cout &lt;&lt; endl &lt;&lt; res.<a name="a23"></a><a class="code" href="a00044.html#a71077c1315555301532e24d4d2b95ea2" title="Returns count of bits which are 1.">count</a>() &lt;&lt; endl;
}

<span class="comment">// ---------------------------------------------------------</span>



<span class="keywordtype">int</span> <a name="a24"></a><a class="code" href="a00106.html#a840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>)
{
    time_t start_time = time(0);

    <a class="code" href="a00113.html#adb34fb3c04bbc949324b069298b6ad60">CreateSets</a>();
    <a class="code" href="a00113.html#a8b36b27c3c40d9e559c078673a3a4dc9">FillSets</a>();
    <a class="code" href="a00113.html#a5cb27a7766b9e7c1ea79b2741714b404">EnumerateSets</a>();
    <a class="code" href="a00113.html#a1bdd608971ec7ea3d5c76cf21c7d92e7">OrSets</a>();

    time_t end_time = time(0);
    <span class="keywordtype">unsigned</span> elapsed = unsigned(end_time - start_time);
    cout &lt;&lt; <span class="stringliteral">&quot;elapsed=&quot;</span> &lt;&lt; elapsed &lt;&lt; endl;
    <span class="keywordtype">unsigned</span> ops;
    <span class="keywordflow">if</span> (elapsed)
        ops = setscount / elapsed;
    <span class="keywordflow">else</span>
        ops = setscount;

    cout &lt;&lt; <span class="stringliteral">&quot;Time = &quot;</span> &lt;&lt; (end_time - start_time) &lt;&lt; endl;
    cout &lt;&lt; <span class="stringliteral">&quot;Operations per second:&quot;</span> &lt;&lt; ops &lt;&lt; endl;

    <a class="code" href="a00113.html#aa777f579687be6096cdbb8b2d70baf6e">DestroySets</a>();

    <span class="keywordflow">return</span> 0;
}

  
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