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<p>Horspool's algorithm that finds if a string contains a substring (<a href="https://en.wikipedia.org/wiki/Boyer%E2%80%93Moore%E2%80%93Horspool_algorithm">https://en.wikipedia.org/wiki/Boyer%E2%80%93Moore%E2%80%93Horspool_algorithm</a>)
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;unordered_map&gt;</code><br />
<code>#include &lt;cassert&gt;</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for horspool.cpp:</div>
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Namespaces</h2></td></tr>
<tr class="memitem:df/dcb/namespacestrings"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../df/dcb/namespacestrings.html">strings</a></td></tr>
<tr class="memdesc:df/dcb/namespacestrings"><td class="mdescLeft">&#160;</td><td class="mdescRight">Algorithms with strings. <br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:d5/d02/namespacehorspool"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d5/d02/namespacehorspool.html">horspool</a></td></tr>
<tr class="memdesc:d5/d02/namespacehorspool"><td class="mdescLeft">&#160;</td><td class="mdescRight">Functions for <a href="https://en.wikipedia.org/wiki/Boyer%E2%80%93Moore%E2%80%93Horspool_algorithm" target="_blank">Horspool's</a> algorithm. <br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a1a9c3aa55ccc79d0f47d50c580997336"><td class="memItemLeft" align="right" valign="top"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map</a>&lt; char, int &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d3/dfe/horspool_8cpp.html#a1a9c3aa55ccc79d0f47d50c580997336">strings::horspool::findShiftTable</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;prototype)</td></tr>
<tr class="separator:a1a9c3aa55ccc79d0f47d50c580997336"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a9884bca75ce39c116697ea2574adb37d"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;text, const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;prototype)</td></tr>
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<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d3/dfe/horspool_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function with test cases for Horspool's algorithm. <br /></td></tr>
<tr class="separator:aa8dca7b867074164d5f45b0f3851269d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d3/dfe/horspool_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main Function that calls test function. <br /></td></tr>
<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Horspool's algorithm that finds if a string contains a substring (<a href="https://en.wikipedia.org/wiki/Boyer%E2%80%93Moore%E2%80%93Horspool_algorithm">https://en.wikipedia.org/wiki/Boyer%E2%80%93Moore%E2%80%93Horspool_algorithm</a>) </p>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/ckontakis" target="_blank">Harry Kontakis</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="a1a9c3aa55ccc79d0f47d50c580997336" name="a1a9c3aa55ccc79d0f47d50c580997336"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a1a9c3aa55ccc79d0f47d50c580997336">&#9670;&#160;</a></span>findShiftTable()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map</a>&lt; char, int &gt; strings::horspool::findShiftTable </td>
<td>(</td>
<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;&#160;</td>
<td class="paramname"><em>prototype</em></td><td>)</td>
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<p>A function that finds the shift table of the given prototype string that we need in Horpool's algorithm. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">prototype</td><td>is the substring that we use to find shift table </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Shift Table of Horspool's algorithm </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 26</span> {</div>
<div class="line"><span class="lineno"> 27</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map&lt;char, int&gt;</a></div>
<div class="line"><span class="lineno"> 28</span> shiftTable; <span class="comment">// A HashMap for shift table that has characters for keys and integers for values</span></div>
<div class="line"><span class="lineno"> 29</span> </div>
<div class="line"><span class="lineno"> 30</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>();</div>
<div class="line"><span class="lineno"> 31</span> i++) { <span class="comment">// Checking all characters of prototype string</span></div>
<div class="line"><span class="lineno"> 32</span> <span class="keywordflow">if</span> (shiftTable.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/find.html">find</a>(prototype[i]) ==</div>
<div class="line"><span class="lineno"> 33</span> shiftTable.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/end.html">end</a>()) { <span class="comment">// If character does not exist in HashMap</span></div>
<div class="line"><span class="lineno"> 34</span> <span class="keywordflow">if</span> (i != prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() - 1) {</div>
<div class="line"><span class="lineno"> 35</span> shiftTable.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/insert.html">insert</a>(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a>(</div>
<div class="line"><span class="lineno"> 36</span> prototype[i], prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() - i -</div>
<div class="line"><span class="lineno"> 37</span> 1)); <span class="comment">// Insert the character as key and the size of prototype string - index of character - 1 as value</span></div>
<div class="line"><span class="lineno"> 38</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 39</span> shiftTable.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/insert.html">insert</a>(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a>(</div>
<div class="line"><span class="lineno"> 40</span> prototype[i],</div>
<div class="line"><span class="lineno"> 41</span> prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>())); <span class="comment">// Insert the character as key and the size of prototype string as value</span></div>
<div class="line"><span class="lineno"> 42</span> }</div>
<div class="line"><span class="lineno"> 43</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 44</span> <span class="keywordflow">if</span> (i != prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() - 1) {</div>
<div class="line"><span class="lineno"> 45</span> shiftTable[prototype[i]] = prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/size.html">size</a>() - i - 1;</div>
<div class="line"><span class="lineno"> 46</span> }</div>
<div class="line"><span class="lineno"> 47</span> }</div>
<div class="line"><span class="lineno"> 48</span> }</div>
<div class="line"><span class="lineno"> 49</span> <span class="keywordflow">return</span> shiftTable;</div>
<div class="line"><span class="lineno"> 50</span>}</div>
<div class="ttc" id="aend_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/unordered_map/end.html">std::unordered_map::end</a></div><div class="ttdeci">T end(T... args)</div></div>
<div class="ttc" id="afind_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/unordered_map/find.html">std::unordered_map::find</a></div><div class="ttdeci">T find(T... args)</div></div>
<div class="ttc" id="ainsert_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/unordered_map/insert.html">std::unordered_map::insert</a></div><div class="ttdeci">T insert(T... args)</div></div>
<div class="ttc" id="amake_pair_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/pair/make_pair.html">std::make_pair</a></div><div class="ttdeci">T make_pair(T... args)</div></div>
<div class="ttc" id="asize_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">std::string::size</a></div><div class="ttdeci">T size(T... args)</div></div>
<div class="ttc" id="aunordered_map_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a9884bca75ce39c116697ea2574adb37d">&#9670;&#160;</a></span>horspool()</h2>
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<div class="memproto">
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<tr>
<td class="memname">bool strings::horspool::horspool </td>
<td>(</td>
<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;&#160;</td>
<td class="paramname"><em>text</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;&#160;</td>
<td class="paramname"><em>prototype</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>A function that implements Horspool's algorithm. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">text</td><td>is the string that we are searching if there is a substring </td></tr>
<tr><td class="paramname">prototype</td><td>is the substring that we are searching in text </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>true if text string contains prototype string </dd>
<dd>
false if text string does not contain prototype string </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 59</span> {</div>
<div class="line"><span class="lineno"> 60</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map&lt;char, int&gt;</a> shiftTable = <a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a1a9c3aa55ccc79d0f47d50c580997336">findShiftTable</a>(</div>
<div class="line"><span class="lineno"> 61</span> prototype); <span class="comment">// Initialise shift table calling findShiftTable function</span></div>
<div class="line"><span class="lineno"> 62</span> </div>
<div class="line"><span class="lineno"> 63</span> <span class="keywordtype">int</span> i = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(</div>
<div class="line"><span class="lineno"> 64</span> prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() -</div>
<div class="line"><span class="lineno"> 65</span> 1); <span class="comment">// Index that we shift in text to find the substring</span></div>
<div class="line"><span class="lineno"> 66</span> <span class="keywordflow">while</span> (i &lt; text.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>()) {</div>
<div class="line"><span class="lineno"> 67</span> <span class="keywordtype">int</span> j = i, <a class="code hl_function" href="../../d4/d18/composite__simpson__rule_8cpp.html#a1b74d828b33760094906797042b89442">k</a> = 0;</div>
<div class="line"><span class="lineno"> 68</span> <span class="keywordtype">bool</span> flag = <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 69</span> </div>
<div class="line"><span class="lineno"> 70</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> z = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() - 1); z &gt;= 0 &amp;&amp; flag;</div>
<div class="line"><span class="lineno"> 71</span> z--) { <span class="comment">// Checking if all characters of substring are equal with all characters of string</span></div>
<div class="line"><span class="lineno"> 72</span> <span class="keywordflow">if</span> (text[j] == prototype[z]) {</div>
<div class="line"><span class="lineno"> 73</span> <a class="code hl_function" href="../../d4/d18/composite__simpson__rule_8cpp.html#a1b74d828b33760094906797042b89442">k</a>++;</div>
<div class="line"><span class="lineno"> 74</span> j--;</div>
<div class="line"><span class="lineno"> 75</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 76</span> flag = <span class="keyword">false</span>; <span class="comment">// If two characters are not equal set flag to false and break from loop</span></div>
<div class="line"><span class="lineno"> 77</span> }</div>
<div class="line"><span class="lineno"> 78</span> }</div>
<div class="line"><span class="lineno"> 79</span> </div>
<div class="line"><span class="lineno"> 80</span> <span class="keywordflow">if</span> (k ==</div>
<div class="line"><span class="lineno"> 81</span> prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>()) { <span class="comment">// If all characters match then return true</span></div>
<div class="line"><span class="lineno"> 82</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 83</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 84</span> <span class="keywordflow">if</span> (shiftTable.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/find.html">find</a>(text[i]) != shiftTable.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/end.html">end</a>()) {</div>
<div class="line"><span class="lineno"> 85</span> i += shiftTable[text[i]]; <span class="comment">// If shift table contains the character then shift index as many steps as value</span></div>
<div class="line"><span class="lineno"> 86</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><span class="lineno"> 87</span> i += prototype.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>(); <span class="comment">// If character does not exist in shift table then shift index as many steps as size of prototype string</span></div>
<div class="line"><span class="lineno"> 88</span> }</div>
<div class="line"><span class="lineno"> 89</span> }</div>
<div class="line"><span class="lineno"> 90</span> }</div>
<div class="line"><span class="lineno"> 91</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 92</span>}</div>
<div class="ttc" id="acomposite__simpson__rule_8cpp_html_a1b74d828b33760094906797042b89442"><div class="ttname"><a href="../../d4/d18/composite__simpson__rule_8cpp.html#a1b74d828b33760094906797042b89442">numerical_methods::simpson_method::k</a></div><div class="ttdeci">double k(double x)</div><div class="ttdoc">Another test function.</div><div class="ttdef"><b>Definition:</b> composite_simpson_rule.cpp:117</div></div>
<div class="ttc" id="ahorspool_8cpp_html_a1a9c3aa55ccc79d0f47d50c580997336"><div class="ttname"><a href="../../d3/dfe/horspool_8cpp.html#a1a9c3aa55ccc79d0f47d50c580997336">strings::horspool::findShiftTable</a></div><div class="ttdeci">std::unordered_map&lt; char, int &gt; findShiftTable(const std::string &amp;prototype)</div><div class="ttdef"><b>Definition:</b> horspool.cpp:26</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
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<p>Main Function that calls test function. </p>
<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 119</span> {</div>
<div class="line"><span class="lineno"> 120</span> <a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>();</div>
<div class="line"><span class="lineno"> 121</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 122</span>}</div>
<div class="ttc" id="ahorspool_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d3/dfe/horspool_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Function with test cases for Horspool's algorithm.</div><div class="ttdef"><b>Definition:</b> horspool.cpp:100</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#aa8dca7b867074164d5f45b0f3851269d">&#9670;&#160;</a></span>test()</h2>
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<td class="memname">static void test </td>
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<p>Function with test cases for Horspool's algorithm. </p>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 100</span> {</div>
<div class="line"><span class="lineno"> 101</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;Hello World&quot;</span>,<span class="stringliteral">&quot;World&quot;</span>) == <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 102</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;Hello World&quot;</span>,<span class="stringliteral">&quot; World&quot;</span>) == <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 103</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;Hello World&quot;</span>,<span class="stringliteral">&quot;ello&quot;</span>) == <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 104</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;Hello World&quot;</span>,<span class="stringliteral">&quot;rld&quot;</span>) == <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 105</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;Hello&quot;</span>,<span class="stringliteral">&quot;Helo&quot;</span>) == <span class="keyword">false</span>);</div>
<div class="line"><span class="lineno"> 106</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;c++_algorithms&quot;</span>,<span class="stringliteral">&quot;c++_algorithms&quot;</span>) == <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 107</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;c++_algorithms&quot;</span>,<span class="stringliteral">&quot;c++_&quot;</span>) == <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 108</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;Hello&quot;</span>,<span class="stringliteral">&quot;Hello World&quot;</span>) == <span class="keyword">false</span>);</div>
<div class="line"><span class="lineno"> 109</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;c++_algorithms&quot;</span>,<span class="stringliteral">&quot;&quot;</span>) == <span class="keyword">false</span>);</div>
<div class="line"><span class="lineno"> 110</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;c++&quot;</span>,<span class="stringliteral">&quot;c&quot;</span>) == <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 111</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;3458934793&quot;</span>,<span class="stringliteral">&quot;4793&quot;</span>) == <span class="keyword">true</span>);</div>
<div class="line"><span class="lineno"> 112</span> assert(strings::horspool::horspool(<span class="stringliteral">&quot;3458934793&quot;</span>,<span class="stringliteral">&quot;123&quot;</span>) == <span class="keyword">false</span>);</div>
<div class="line"><span class="lineno"> 113</span>}</div>
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