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<div class="headertitle"><div class="title">horspool.cpp</div></div>
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<div class="contents">
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<a href="../../d3/dfe/horspool_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include <iostream></span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include <unordered_map></span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include <cassert></span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../df/dcb/namespacestrings.html">strings</a> {</div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d5/d02/namespacehorspool.html">horspool</a> {</div>
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<div class="foldopen" id="foldopen00026" data-start="{" data-end="}">
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"><a class="line" href="../../d3/dfe/horspool_8cpp.html#a1a9c3aa55ccc79d0f47d50c580997336"> 26</a></span>std::unordered_map<char, int> <a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a1a9c3aa55ccc79d0f47d50c580997336">findShiftTable</a>(<span class="keyword">const</span> std::string &prototype) {</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> std::unordered_map<char, int></div>
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<div class="line"><a id="l00028" name="l00028"></a><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>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < prototype.size();</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> i++) { <span class="comment">// Checking all characters of prototype string</span></div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keywordflow">if</span> (shiftTable.find(prototype[i]) ==</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> shiftTable.end()) { <span class="comment">// If character does not exist in HashMap</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <span class="keywordflow">if</span> (i != prototype.size() - 1) {</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> shiftTable.insert(std::make_pair(</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> prototype[i], prototype.size() - i -</div>
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<div class="line"><a id="l00037" name="l00037"></a><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>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> shiftTable.insert(std::make_pair(</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> prototype[i],</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> prototype.size())); <span class="comment">// Insert the character as key and the size of prototype string as value</span></div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> }</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keywordflow">if</span> (i != prototype.size() - 1) {</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> shiftTable[prototype[i]] = prototype.size() - i - 1;</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> }</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> }</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> }</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keywordflow">return</span> shiftTable;</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span>}</div>
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</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span></div>
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<div class="foldopen" id="foldopen00059" data-start="{" data-end="}">
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d"> 59</a></span><span class="keywordtype">bool</span> <a class="code hl_namespace" href="../../d5/d02/namespacehorspool.html">horspool</a>(<span class="keyword">const</span> std::string &text, <span class="keyword">const</span> std::string &prototype) {</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> std::unordered_map<char, int> shiftTable = <a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a1a9c3aa55ccc79d0f47d50c580997336">findShiftTable</a>(</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> prototype); <span class="comment">// Initialise shift table calling findShiftTable function</span></div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> </div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keywordtype">int</span> i = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> prototype.size() -</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> 1); <span class="comment">// Index that we shift in text to find the substring</span></div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordflow">while</span> (i < text.size()) {</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordtype">int</span> j = i, k = 0;</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keywordtype">bool</span> flag = <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> z = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(prototype.size() - 1); z >= 0 && flag;</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> z--) { <span class="comment">// Checking if all characters of substring are equal with all characters of string</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keywordflow">if</span> (text[j] == prototype[z]) {</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> k++;</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> j--;</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00076" name="l00076"></a><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>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> }</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> }</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keywordflow">if</span> (k ==</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> prototype.size()) { <span class="comment">// If all characters match then return true</span></div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="keywordflow">if</span> (shiftTable.find(text[i]) != shiftTable.end()) {</div>
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<div class="line"><a id="l00085" name="l00085"></a><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>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> i += prototype.size(); <span class="comment">// If character does not exist in shift table then shift index as many steps as size of prototype string</span></div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> }</div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> }</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> }</div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span>}</div>
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</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span>} <span class="comment">// namespace horspool</span></div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span>} <span class="comment">// namespace strings</span></div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span></div>
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<div class="foldopen" id="foldopen00100" data-start="{" data-end="}">
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"><a class="line" href="../../d3/dfe/horspool_8cpp.html#aa8dca7b867074164d5f45b0f3851269d"> 100</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(){</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"Hello World"</span>,<span class="stringliteral">"World"</span>) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"Hello World"</span>,<span class="stringliteral">" World"</span>) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"Hello World"</span>,<span class="stringliteral">"ello"</span>) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"Hello World"</span>,<span class="stringliteral">"rld"</span>) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"Hello"</span>,<span class="stringliteral">"Helo"</span>) == <span class="keyword">false</span>);</div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"c++_algorithms"</span>,<span class="stringliteral">"c++_algorithms"</span>) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"c++_algorithms"</span>,<span class="stringliteral">"c++_"</span>) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"Hello"</span>,<span class="stringliteral">"Hello World"</span>) == <span class="keyword">false</span>);</div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"c++_algorithms"</span>,<span class="stringliteral">""</span>) == <span class="keyword">false</span>);</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"c++"</span>,<span class="stringliteral">"c"</span>) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"3458934793"</span>,<span class="stringliteral">"4793"</span>) == <span class="keyword">true</span>);</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> assert(<a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a>(<span class="stringliteral">"3458934793"</span>,<span class="stringliteral">"123"</span>) == <span class="keyword">false</span>);</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span>}</div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span></div>
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<div class="foldopen" id="foldopen00119" data-start="{" data-end="}">
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"><a class="line" href="../../d3/dfe/horspool_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 119</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>(){</div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <a class="code hl_function" href="../../d3/dfe/horspool_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>();</div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span>}</div>
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<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< char, int > findShiftTable(const std::string &prototype)</div><div class="ttdef"><b>Definition</b> <a href="#l00026">horspool.cpp:26</a></div></div>
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<div class="ttc" id="ahorspool_8cpp_html_a9884bca75ce39c116697ea2574adb37d"><div class="ttname"><a href="../../d3/dfe/horspool_8cpp.html#a9884bca75ce39c116697ea2574adb37d">strings::horspool::horspool</a></div><div class="ttdeci">bool horspool(const std::string &text, const std::string &prototype)</div><div class="ttdef"><b>Definition</b> <a href="#l00059">horspool.cpp:59</a></div></div>
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<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> <a href="#l00100">horspool.cpp:100</a></div></div>
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<div class="ttc" id="ahorspool_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d3/dfe/horspool_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">Main Function that calls test function.</div><div class="ttdef"><b>Definition</b> <a href="#l00119">horspool.cpp:119</a></div></div>
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<div class="ttc" id="anamespacehorspool_html"><div class="ttname"><a href="../../d5/d02/namespacehorspool.html">horspool</a></div><div class="ttdoc">Functions for Horspool's algorithm.</div></div>
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<div class="ttc" id="anamespacestrings_html"><div class="ttname"><a href="../../df/dcb/namespacestrings.html">strings</a></div><div class="ttdoc">String algorithms.</div><div class="ttdef"><b>Definition</b> <a href="../../d3/db2/boyer__moore_8cpp_source.html#l00058">boyer_moore.cpp:58</a></div></div>
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