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<div class="headertitle"><div class="title">double_hashing Namespace Reference<div class="ingroups"><a class="el" href="../../d4/d39/group__open__addressing.html">Open Addressing</a></div></div></div>
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<p>An implementation of hash table using <a href="https://en.wikipedia.org/wiki/Double_hashing" target="_blank">double hashing</a> algorithm.
<a href="#details">More...</a></p>
<table class="memberdecls">
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d9/dde/structdouble__hashing_1_1_entry.html">Entry</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Typedefs</h2></td></tr>
<tr class="memitem:a92054ec26cd6907c163fb00a596bebdd" id="r_a92054ec26cd6907c163fb00a596bebdd"><td class="memItemLeft" align="right" valign="top"><a id="a92054ec26cd6907c163fb00a596bebdd" name="a92054ec26cd6907c163fb00a596bebdd"></a>
using&#160;</td><td class="memItemRight" valign="bottom"><b>Entry</b> = struct Entry</td></tr>
<tr class="separator:a92054ec26cd6907c163fb00a596bebdd"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:ac2adfce49ac57f6dbd1778d2c1ce0d2b" id="r_ac2adfce49ac57f6dbd1778d2c1ce0d2b"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ac2adfce49ac57f6dbd1778d2c1ce0d2b">putProber</a> (const <a class="el" href="../../d9/dde/structdouble__hashing_1_1_entry.html">Entry</a> &amp;entry, int key)</td></tr>
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<tr class="memitem:a29f543e2626bad58907661e1e45028a6" id="r_a29f543e2626bad58907661e1e45028a6"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a29f543e2626bad58907661e1e45028a6">searchingProber</a> (const <a class="el" href="../../d9/dde/structdouble__hashing_1_1_entry.html">Entry</a> &amp;entry, int key)</td></tr>
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<tr class="memitem:a0d90726ed1de7b3d2ae261baed048003" id="r_a0d90726ed1de7b3d2ae261baed048003"><td class="memItemLeft" align="right" valign="top">size_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a0d90726ed1de7b3d2ae261baed048003">hashFxn</a> (int key)</td></tr>
<tr class="memdesc:a0d90726ed1de7b3d2ae261baed048003"><td class="mdescLeft">&#160;</td><td class="mdescRight">Hash a key. Uses the STL library's <code><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/hash.html">std::hash()</a></code> function. <br /></td></tr>
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<tr class="memitem:a33968a1178289ab61445dd4000df7082" id="r_a33968a1178289ab61445dd4000df7082"><td class="memItemLeft" align="right" valign="top">size_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a33968a1178289ab61445dd4000df7082">otherHashFxn</a> (int key)</td></tr>
<tr class="memdesc:a33968a1178289ab61445dd4000df7082"><td class="mdescLeft">&#160;</td><td class="mdescRight">Used for second hash function. <br /></td></tr>
<tr class="separator:a33968a1178289ab61445dd4000df7082"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8f8ff4fb018e1bb32d67d8a1885d3200" id="r_a8f8ff4fb018e1bb32d67d8a1885d3200"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a8f8ff4fb018e1bb32d67d8a1885d3200">doubleHash</a> (int key, bool searching)</td></tr>
<tr class="memdesc:a8f8ff4fb018e1bb32d67d8a1885d3200"><td class="mdescLeft">&#160;</td><td class="mdescRight">Performs double hashing to resolve collisions. <br /></td></tr>
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<tr class="memitem:a1e901418c759627557eff359b8db38cd" id="r_a1e901418c759627557eff359b8db38cd"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a1e901418c759627557eff359b8db38cd">display</a> ()</td></tr>
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<tr class="memitem:af4981819aae8bc7e7beeaef02615e30d" id="r_af4981819aae8bc7e7beeaef02615e30d"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#af4981819aae8bc7e7beeaef02615e30d">rehash</a> ()</td></tr>
<tr class="separator:af4981819aae8bc7e7beeaef02615e30d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a28083ecac6eb94b643281875c8665931" id="r_a28083ecac6eb94b643281875c8665931"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a28083ecac6eb94b643281875c8665931">remove</a> (int key)</td></tr>
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<tr class="memitem:a5d06e4598569526294f10104875f6824" id="r_a5d06e4598569526294f10104875f6824"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a5d06e4598569526294f10104875f6824">removalInfo</a> (int key)</td></tr>
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Variables</h2></td></tr>
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int&#160;</td><td class="memItemRight" valign="bottom"><b>notPresent</b></td></tr>
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<tr class="memitem:a0e2ff0f9cfc7b54e60a6561f792d8b26" id="r_a0e2ff0f9cfc7b54e60a6561f792d8b26"><td class="memItemLeft" align="right" valign="top"><a id="a0e2ff0f9cfc7b54e60a6561f792d8b26" name="a0e2ff0f9cfc7b54e60a6561f792d8b26"></a>
<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>&lt; <a class="el" href="../../d9/dde/structdouble__hashing_1_1_entry.html">Entry</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><b>table</b></td></tr>
<tr class="separator:a0e2ff0f9cfc7b54e60a6561f792d8b26"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a60a52265027518b25655d730f960013a" id="r_a60a52265027518b25655d730f960013a"><td class="memItemLeft" align="right" valign="top"><a id="a60a52265027518b25655d730f960013a" name="a60a52265027518b25655d730f960013a"></a>
int&#160;</td><td class="memItemRight" valign="bottom"><b>totalSize</b></td></tr>
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<tr class="memitem:a4e9a7219d34e781e4e73d74a968b26c1" id="r_a4e9a7219d34e781e4e73d74a968b26c1"><td class="memItemLeft" align="right" valign="top"><a id="a4e9a7219d34e781e4e73d74a968b26c1" name="a4e9a7219d34e781e4e73d74a968b26c1"></a>
int&#160;</td><td class="memItemRight" valign="bottom"><b>tomb</b> = -1</td></tr>
<tr class="separator:a4e9a7219d34e781e4e73d74a968b26c1"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a5f5323b52037218cf5ae888778b7f980" id="r_a5f5323b52037218cf5ae888778b7f980"><td class="memItemLeft" align="right" valign="top"><a id="a5f5323b52037218cf5ae888778b7f980" name="a5f5323b52037218cf5ae888778b7f980"></a>
int&#160;</td><td class="memItemRight" valign="bottom"><b>size</b></td></tr>
<tr class="separator:a5f5323b52037218cf5ae888778b7f980"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae5d042a7f6038a2ec9e5718d0c7fb31f" id="r_ae5d042a7f6038a2ec9e5718d0c7fb31f"><td class="memItemLeft" align="right" valign="top"><a id="ae5d042a7f6038a2ec9e5718d0c7fb31f" name="ae5d042a7f6038a2ec9e5718d0c7fb31f"></a>
bool&#160;</td><td class="memItemRight" valign="bottom"><b>rehashing</b></td></tr>
<tr class="separator:ae5d042a7f6038a2ec9e5718d0c7fb31f"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>An implementation of hash table using <a href="https://en.wikipedia.org/wiki/Double_hashing" target="_blank">double hashing</a> algorithm. </p>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a79a9c914a6c68275b3640303d7faad8a" name="a79a9c914a6c68275b3640303d7faad8a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a79a9c914a6c68275b3640303d7faad8a">&#9670;&#160;</a></span>add()</h2>
<div class="memitem">
<div class="memproto">
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<td class="memname">void double_hashing::add </td>
<td>(</td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Checks for load factor here </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">key</td><td>key value to add to the table </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><span class="lineno"> 185</span> {</div>
<div class="line"><span class="lineno"> 186</span> <span class="comment">// auto* entry = new Entry();</span></div>
<div class="line"><span class="lineno"> 187</span> <span class="comment">// entry-&gt;key = key;</span></div>
<div class="line"><span class="lineno"> 188</span> <span class="keywordtype">int</span> index = <a class="code hl_function" href="#a8f8ff4fb018e1bb32d67d8a1885d3200">doubleHash</a>(key, <span class="keyword">false</span>);</div>
<div class="line"><span class="lineno"> 189</span> table[index].key = key;</div>
<div class="line"><span class="lineno"> 190</span> <span class="comment">// Load factor greater than 0.5 causes resizing</span></div>
<div class="line"><span class="lineno"> 191</span> <span class="keywordflow">if</span> (++size / <span class="keyword">static_cast&lt;</span><span class="keywordtype">double</span><span class="keyword">&gt;</span>(totalSize) &gt;= 0.5) {</div>
<div class="line"><span class="lineno"> 192</span> <a class="code hl_function" href="#af4981819aae8bc7e7beeaef02615e30d">rehash</a>();</div>
<div class="line"><span class="lineno"> 193</span> }</div>
<div class="line"><span class="lineno"> 194</span>}</div>
<div class="ttc" id="anamespacedouble__hashing_html_a8f8ff4fb018e1bb32d67d8a1885d3200"><div class="ttname"><a href="#a8f8ff4fb018e1bb32d67d8a1885d3200">double_hashing::doubleHash</a></div><div class="ttdeci">int doubleHash(int key, bool searching)</div><div class="ttdoc">Performs double hashing to resolve collisions.</div><div class="ttdef"><b>Definition</b> double_hash_hash_table.cpp:71</div></div>
<div class="ttc" id="anamespacedouble__hashing_html_af4981819aae8bc7e7beeaef02615e30d"><div class="ttname"><a href="#af4981819aae8bc7e7beeaef02615e30d">double_hashing::rehash</a></div><div class="ttdeci">void rehash()</div><div class="ttdef"><b>Definition</b> double_hash_hash_table.cpp:161</div></div>
</div><!-- fragment --><div class="dynheader">
Here is the call graph for this function:</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a9c652b2e467e5d250dfe3bed83b12560">&#9670;&#160;</a></span>addInfo()</h2>
<div class="memitem">
<div class="memproto">
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<tr>
<td class="memname">void double_hashing::addInfo </td>
<td>(</td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Information about the adding process </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">key</td><td>key value to add to table </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><span class="lineno"> 212</span> {</div>
<div class="line"><span class="lineno"> 213</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Initial table: &quot;</span>;</div>
<div class="line"><span class="lineno"> 214</span> display();</div>
<div class="line"><span class="lineno"> 215</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 216</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;hash of &quot;</span> &lt;&lt; key &lt;&lt; <span class="stringliteral">&quot; is &quot;</span> &lt;&lt; <a class="code hl_function" href="#a0d90726ed1de7b3d2ae261baed048003">hashFxn</a>(key) &lt;&lt; <span class="stringliteral">&quot; % &quot;</span></div>
<div class="line"><span class="lineno"> 217</span> &lt;&lt; totalSize &lt;&lt; <span class="stringliteral">&quot; == &quot;</span> &lt;&lt; <a class="code hl_function" href="#a0d90726ed1de7b3d2ae261baed048003">hashFxn</a>(key) % totalSize;</div>
<div class="line"><span class="lineno"> 218</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 219</span> <a class="code hl_function" href="../../da/d41/uint128__t_8hpp.html#a3ff77262ffd6743df5b808d41382a6f3">add</a>(key);</div>
<div class="line"><span class="lineno"> 220</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;New table: &quot;</span>;</div>
<div class="line"><span class="lineno"> 221</span> display();</div>
<div class="line"><span class="lineno"> 222</span>}</div>
<div class="ttc" id="abasic_ostream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a></div></div>
<div class="ttc" id="aendl_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a></div><div class="ttdeci">T endl(T... args)</div></div>
<div class="ttc" id="anamespacedouble__hashing_html_a0d90726ed1de7b3d2ae261baed048003"><div class="ttname"><a href="#a0d90726ed1de7b3d2ae261baed048003">double_hashing::hashFxn</a></div><div class="ttdeci">size_t hashFxn(int key)</div><div class="ttdoc">Hash a key. Uses the STL library's std::hash() function.</div><div class="ttdef"><b>Definition</b> double_hash_hash_table.cpp:47</div></div>
<div class="ttc" id="auint128__t_8hpp_html_a3ff77262ffd6743df5b808d41382a6f3"><div class="ttname"><a href="../../da/d41/uint128__t_8hpp.html#a3ff77262ffd6743df5b808d41382a6f3">add</a></div><div class="ttdeci">std::string add(const std::string &amp;first, const std::string &amp;second)</div><div class="ttdoc">Adding two string.</div><div class="ttdef"><b>Definition</b> uint128_t.hpp:37</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a1e901418c759627557eff359b8db38cd">&#9670;&#160;</a></span>display()</h2>
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<td class="memname">void double_hashing::display </td>
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<td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
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<p>Displays the table </p><dl class="section return"><dt>Returns</dt><dd>None </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 143</span> {</div>
<div class="line"><span class="lineno"> 144</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; totalSize; i++) {</div>
<div class="line"><span class="lineno"> 145</span> <span class="keywordflow">if</span> (table[i].key == notPresent) {</div>
<div class="line"><span class="lineno"> 146</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot; Empty &quot;</span>;</div>
<div class="line"><span class="lineno"> 147</span> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (table[i].key == tomb) {</div>
<div class="line"><span class="lineno"> 148</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot; Tomb &quot;</span>;</div>
<div class="line"><span class="lineno"> 149</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 150</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot; &quot;</span>;</div>
<div class="line"><span class="lineno"> 151</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; table[i].key;</div>
<div class="line"><span class="lineno"> 152</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot; &quot;</span>;</div>
<div class="line"><span class="lineno"> 153</span> }</div>
<div class="line"><span class="lineno"> 154</span> }</div>
<div class="line"><span class="lineno"> 155</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 156</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a8f8ff4fb018e1bb32d67d8a1885d3200">&#9670;&#160;</a></span>doubleHash()</h2>
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<td class="memname">int double_hashing::doubleHash </td>
<td>(</td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool</td> <td class="paramname"><span class="paramname"><em>searching</em></span>&#160;)</td>
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<p>Performs double hashing to resolve collisions. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">key</td><td>key value to apply double-hash on </td></tr>
<tr><td class="paramname">searching</td><td><code>true</code> to check for conflicts </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Index of key when found </dd>
<dd>
new hash if no conflicts present </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 71</span> {</div>
<div class="line"><span class="lineno"> 72</span> <span class="keywordtype">int</span> hash = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(<a class="code hl_function" href="#a0d90726ed1de7b3d2ae261baed048003">hashFxn</a>(key));</div>
<div class="line"><span class="lineno"> 73</span> <span class="keywordtype">int</span> i = 0;</div>
<div class="line"><span class="lineno"> 74</span> <a class="code hl_struct" href="../../d9/dde/structdouble__hashing_1_1_entry.html">Entry</a> entry;</div>
<div class="line"><span class="lineno"> 75</span> <span class="keywordflow">do</span> {</div>
<div class="line"><span class="lineno"> 76</span> <span class="keywordtype">int</span> index =</div>
<div class="line"><span class="lineno"> 77</span> <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(hash + (i * <a class="code hl_function" href="#a33968a1178289ab61445dd4000df7082">otherHashFxn</a>(key))) % totalSize;</div>
<div class="line"><span class="lineno"> 78</span> entry = table[index];</div>
<div class="line"><span class="lineno"> 79</span> <span class="keywordflow">if</span> (searching) {</div>
<div class="line"><span class="lineno"> 80</span> <span class="keywordflow">if</span> (entry.<a class="code hl_variable" href="../../d9/dde/structdouble__hashing_1_1_entry.html#ae114967c89dbba3b754dc4976bba3248">key</a> == notPresent) {</div>
<div class="line"><span class="lineno"> 81</span> <span class="keywordflow">return</span> notPresent;</div>
<div class="line"><span class="lineno"> 82</span> }</div>
<div class="line"><span class="lineno"> 83</span> <span class="keywordflow">if</span> (searchingProber(entry, key)) {</div>
<div class="line"><span class="lineno"> 84</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Found key!&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 85</span> <span class="keywordflow">return</span> index;</div>
<div class="line"><span class="lineno"> 86</span> }</div>
<div class="line"><span class="lineno"> 87</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Found tombstone or equal hash, checking next&quot;</span></div>
<div class="line"><span class="lineno"> 88</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 89</span> i++;</div>
<div class="line"><span class="lineno"> 90</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 91</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="#ac2adfce49ac57f6dbd1778d2c1ce0d2b">putProber</a>(entry, key)) {</div>
<div class="line"><span class="lineno"> 92</span> <span class="keywordflow">if</span> (!rehashing) {</div>
<div class="line"><span class="lineno"> 93</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Spot found!&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 94</span> }</div>
<div class="line"><span class="lineno"> 95</span> <span class="keywordflow">return</span> index;</div>
<div class="line"><span class="lineno"> 96</span> }</div>
<div class="line"><span class="lineno"> 97</span> <span class="keywordflow">if</span> (!rehashing) {</div>
<div class="line"><span class="lineno"> 98</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Spot taken, looking at next (next index:&quot;</span></div>
<div class="line"><span class="lineno"> 99</span> &lt;&lt; <span class="stringliteral">&quot; &quot;</span></div>
<div class="line"><span class="lineno"> 100</span> &lt;&lt; <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(<a class="code hl_function" href="../../d5/d96/md5_8cpp.html#a88705fab5f92adf3427b4cf76ff33edb">hash</a> + (i * <a class="code hl_function" href="#a33968a1178289ab61445dd4000df7082">otherHashFxn</a>(key))) %</div>
<div class="line"><span class="lineno"> 101</span> totalSize</div>
<div class="line"><span class="lineno"> 102</span> &lt;&lt; <span class="stringliteral">&quot;)&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 103</span> }</div>
<div class="line"><span class="lineno"> 104</span> i++;</div>
<div class="line"><span class="lineno"> 105</span> }</div>
<div class="line"><span class="lineno"> 106</span> <span class="keywordflow">if</span> (i == totalSize * 100) {</div>
<div class="line"><span class="lineno"> 107</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;DoubleHash probe failed&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 108</span> <span class="keywordflow">return</span> notPresent;</div>
<div class="line"><span class="lineno"> 109</span> }</div>
<div class="line"><span class="lineno"> 110</span> } <span class="keywordflow">while</span> (entry.<a class="code hl_variable" href="../../d9/dde/structdouble__hashing_1_1_entry.html#ae114967c89dbba3b754dc4976bba3248">key</a> != notPresent);</div>
<div class="line"><span class="lineno"> 111</span> <span class="keywordflow">return</span> notPresent;</div>
<div class="line"><span class="lineno"> 112</span>}</div>
<div class="ttc" id="amd5_8cpp_html_a88705fab5f92adf3427b4cf76ff33edb"><div class="ttname"><a href="../../d5/d96/md5_8cpp.html#a88705fab5f92adf3427b4cf76ff33edb">hashing::md5::hash</a></div><div class="ttdeci">void * hash(const std::string &amp;message)</div><div class="ttdoc">Converts the string to bytestring and calls the main algorithm.</div><div class="ttdef"><b>Definition</b> md5.cpp:287</div></div>
<div class="ttc" id="anamespacedouble__hashing_html_a33968a1178289ab61445dd4000df7082"><div class="ttname"><a href="#a33968a1178289ab61445dd4000df7082">double_hashing::otherHashFxn</a></div><div class="ttdeci">size_t otherHashFxn(int key)</div><div class="ttdoc">Used for second hash function.</div><div class="ttdef"><b>Definition</b> double_hash_hash_table.cpp:58</div></div>
<div class="ttc" id="anamespacedouble__hashing_html_ac2adfce49ac57f6dbd1778d2c1ce0d2b"><div class="ttname"><a href="#ac2adfce49ac57f6dbd1778d2c1ce0d2b">double_hashing::putProber</a></div><div class="ttdeci">bool putProber(const Entry &amp;entry, int key)</div><div class="ttdef"><b>Definition</b> double_hash_hash_table.cpp:120</div></div>
<div class="ttc" id="astructdouble__hashing_1_1_entry_html"><div class="ttname"><a href="../../d9/dde/structdouble__hashing_1_1_entry.html">double_hashing::Entry</a></div><div class="ttdef"><b>Definition</b> double_hash_hash_table.cpp:36</div></div>
<div class="ttc" id="astructdouble__hashing_1_1_entry_html_ae114967c89dbba3b754dc4976bba3248"><div class="ttname"><a href="../../d9/dde/structdouble__hashing_1_1_entry.html#ae114967c89dbba3b754dc4976bba3248">double_hashing::Entry::key</a></div><div class="ttdeci">int key</div><div class="ttdoc">key value</div><div class="ttdef"><b>Definition</b> double_hash_hash_table.cpp:38</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a0d90726ed1de7b3d2ae261baed048003">&#9670;&#160;</a></span>hashFxn()</h2>
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<td class="memname">size_t double_hashing::hashFxn </td>
<td>(</td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span></td><td>)</td>
<td></td>
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<p>Hash a key. Uses the STL library's <code><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/hash.html">std::hash()</a></code> function. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">key</td><td>value to hash </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>hash value of the key </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 47</span> {</div>
<div class="line"><span class="lineno"> 48</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/hash.html">std::hash&lt;int&gt;</a> hash;</div>
<div class="line"><span class="lineno"> 49</span> <span class="keywordflow">return</span> hash(key);</div>
<div class="line"><span class="lineno"> 50</span>}</div>
<div class="ttc" id="ahash_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/hash.html">std::hash</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a33968a1178289ab61445dd4000df7082">&#9670;&#160;</a></span>otherHashFxn()</h2>
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<td class="memname">size_t double_hashing::otherHashFxn </td>
<td>(</td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Used for second hash function. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">key</td><td>key value to hash </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>hash value of the key </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 58</span> {</div>
<div class="line"><span class="lineno"> 59</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/hash.html">std::hash&lt;int&gt;</a> hash;</div>
<div class="line"><span class="lineno"> 60</span> <span class="keywordflow">return</span> 1 + (7 - (hash(key) % 7));</div>
<div class="line"><span class="lineno"> 61</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ac2adfce49ac57f6dbd1778d2c1ce0d2b">&#9670;&#160;</a></span>putProber()</h2>
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<td class="memname">bool double_hashing::putProber </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="../../d9/dde/structdouble__hashing_1_1_entry.html">Entry</a> &amp;</td> <td class="paramname"><span class="paramname"><em>entry</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span>&#160;)</td>
</tr>
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</div><div class="memdoc">
<p>Finds empty spot in a vector </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">entry</td><td>vector to search in </td></tr>
<tr><td class="paramname">key</td><td>key to search for </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>true</code> if key is not present or is a <code>toumb</code> </dd>
<dd>
<code>false</code> is already occupied </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 120</span> {</div>
<div class="line"><span class="lineno"> 121</span> <span class="keywordflow">if</span> (entry.<a class="code hl_variable" href="../../d9/dde/structdouble__hashing_1_1_entry.html#ae114967c89dbba3b754dc4976bba3248">key</a> == notPresent || entry.<a class="code hl_variable" href="../../d9/dde/structdouble__hashing_1_1_entry.html#ae114967c89dbba3b754dc4976bba3248">key</a> == tomb) {</div>
<div class="line"><span class="lineno"> 122</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 123</span> }</div>
<div class="line"><span class="lineno"> 124</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 125</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#af4981819aae8bc7e7beeaef02615e30d">&#9670;&#160;</a></span>rehash()</h2>
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<td class="memname">void double_hashing::rehash </td>
<td>(</td>
<td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
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<p>Rehashes the table into a bigger table </p><dl class="section return"><dt>Returns</dt><dd>None </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 161</span> {</div>
<div class="line"><span class="lineno"> 162</span> <span class="comment">// Necessary so wall of add info isn&#39;t printed all at once</span></div>
<div class="line"><span class="lineno"> 163</span> rehashing = <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 164</span> <span class="keywordtype">int</span> oldSize = totalSize;</div>
<div class="line"><span class="lineno"> 165</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Entry&gt;</a> oldTable(table);</div>
<div class="line"><span class="lineno"> 166</span> <span class="comment">// Really this should use the next prime number greater than totalSize * 2</span></div>
<div class="line"><span class="lineno"> 167</span> table = <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;Entry&gt;</a>(totalSize * 2);</div>
<div class="line"><span class="lineno"> 168</span> totalSize *= 2;</div>
<div class="line"><span class="lineno"> 169</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; oldSize; i++) {</div>
<div class="line"><span class="lineno"> 170</span> <span class="keywordflow">if</span> (oldTable[i].key != -1 &amp;&amp; oldTable[i].key != notPresent) {</div>
<div class="line"><span class="lineno"> 171</span> size--; <span class="comment">// Size stays the same (add increments size)</span></div>
<div class="line"><span class="lineno"> 172</span> <a class="code hl_function" href="../../da/d41/uint128__t_8hpp.html#a3ff77262ffd6743df5b808d41382a6f3">add</a>(oldTable[i].key);</div>
<div class="line"><span class="lineno"> 173</span> }</div>
<div class="line"><span class="lineno"> 174</span> }</div>
<div class="line"><span class="lineno"> 175</span> <span class="comment">// delete[] oldTable;</span></div>
<div class="line"><span class="lineno"> 176</span> <span class="comment">// oldTable.reset();</span></div>
<div class="line"><span class="lineno"> 177</span> </div>
<div class="line"><span class="lineno"> 178</span> rehashing = <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 179</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Table was rehashed, new size is: &quot;</span> &lt;&lt; totalSize &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 180</span>}</div>
<div class="ttc" id="avector_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a5d06e4598569526294f10104875f6824">&#9670;&#160;</a></span>removalInfo()</h2>
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<td class="memname">void double_hashing::removalInfo </td>
<td>(</td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span></td><td>)</td>
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<p>Information about removal process </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">key</td><td>key value to remove from table </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><span class="lineno"> 227</span> {</div>
<div class="line"><span class="lineno"> 228</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Initial table: &quot;</span>;</div>
<div class="line"><span class="lineno"> 229</span> display();</div>
<div class="line"><span class="lineno"> 230</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 231</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;hash of &quot;</span> &lt;&lt; key &lt;&lt; <span class="stringliteral">&quot; is &quot;</span> &lt;&lt; <a class="code hl_function" href="#a0d90726ed1de7b3d2ae261baed048003">hashFxn</a>(key) &lt;&lt; <span class="stringliteral">&quot; % &quot;</span></div>
<div class="line"><span class="lineno"> 232</span> &lt;&lt; totalSize &lt;&lt; <span class="stringliteral">&quot; == &quot;</span> &lt;&lt; <a class="code hl_function" href="#a0d90726ed1de7b3d2ae261baed048003">hashFxn</a>(key) % totalSize;</div>
<div class="line"><span class="lineno"> 233</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 234</span> remove(key);</div>
<div class="line"><span class="lineno"> 235</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;New table: &quot;</span>;</div>
<div class="line"><span class="lineno"> 236</span> display();</div>
<div class="line"><span class="lineno"> 237</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a28083ecac6eb94b643281875c8665931">&#9670;&#160;</a></span>remove()</h2>
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<td class="memname">void double_hashing::remove </td>
<td>(</td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span></td><td>)</td>
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<p>Removes key. Leaves tombstone upon removal. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">key</td><td>key value to remove </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><span class="lineno"> 199</span> {</div>
<div class="line"><span class="lineno"> 200</span> <span class="keywordtype">int</span> index = <a class="code hl_function" href="#a8f8ff4fb018e1bb32d67d8a1885d3200">doubleHash</a>(key, <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 201</span> <span class="keywordflow">if</span> (index == notPresent) {</div>
<div class="line"><span class="lineno"> 202</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;key not found&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 203</span> }</div>
<div class="line"><span class="lineno"> 204</span> table[index].key = tomb;</div>
<div class="line"><span class="lineno"> 205</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;Removal successful, leaving tombstone&quot;</span> &lt;&lt; <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
<div class="line"><span class="lineno"> 206</span> size--;</div>
<div class="line"><span class="lineno"> 207</span>}</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a29f543e2626bad58907661e1e45028a6">&#9670;&#160;</a></span>searchingProber()</h2>
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<td class="memname">bool double_hashing::searchingProber </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="../../d9/dde/structdouble__hashing_1_1_entry.html">Entry</a> &amp;</td> <td class="paramname"><span class="paramname"><em>entry</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>key</em></span>&#160;)</td>
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<p>Looks for a matching key </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">entry</td><td>vector to search in </td></tr>
<tr><td class="paramname">key</td><td>key value to search </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>true</code> if found </dd>
<dd>
<code>false</code> if not found </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 133</span> {</div>
<div class="line"><span class="lineno"> 134</span> <span class="keywordflow">if</span> (entry.<a class="code hl_variable" href="../../d9/dde/structdouble__hashing_1_1_entry.html#ae114967c89dbba3b754dc4976bba3248">key</a> == key) {</div>
<div class="line"><span class="lineno"> 135</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 136</span> }</div>
<div class="line"><span class="lineno"> 137</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 138</span>}</div>
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