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<div class="headertitle"><div class="title">hamming_distance.cpp</div></div>
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<div class="contents">
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<a href="../../d4/d48/hamming__distance_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="l00014" name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#include <cassert></span> </div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#include <cstdint></span></div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include <iostream></span> </div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d7/d81/namespacebit__manipulation.html">bit_manipulation</a> {</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d4/d1c/namespacehamming__distance.html">hamming_distance</a> {</div>
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<div class="foldopen" id="foldopen00035" data-start="{" data-end="}">
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"><a class="line" href="../../d4/d48/hamming__distance_8cpp.html#a65d845df3fecff7087a2126c7b72030b"> 35</a></span>uint64_t <a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#a65d845df3fecff7087a2126c7b72030b">bitCount</a>(uint64_t value) {</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> uint64_t count = 0;</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keywordflow">while</span> (value) { <span class="comment">// until all bits are zero</span></div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordflow">if</span> (value & 1) { <span class="comment">// check lower bit</span></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> count++;</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> }</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> value >>= 1; <span class="comment">// shift bits, removing lower bit</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">return</span> count;</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span>}</div>
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</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span></div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"><a class="line" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a"> 52</a></span>uint64_t <a class="code hl_namespace" href="../../d4/d1c/namespacehamming__distance.html">hamming_distance</a>(uint64_t a, uint64_t b) { <span class="keywordflow">return</span> <a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#a65d845df3fecff7087a2126c7b72030b">bitCount</a>(a ^ b); }</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span></div>
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<div class="foldopen" id="foldopen00060" data-start="{" data-end="}">
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"><a class="line" href="../../d4/d48/hamming__distance_8cpp.html#a40ba9fe8b5df5c268f0c7d677ff2fe80"> 60</a></span>uint64_t <a class="code hl_namespace" href="../../d4/d1c/namespacehamming__distance.html">hamming_distance</a>(<span class="keyword">const</span> std::string& a, <span class="keyword">const</span> std::string& b) {</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> assert(a.size() == b.size());</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordtype">size_t</span> n = a.size();</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> uint64_t count = 0;</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++) {</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> count += (b[i] != a[i]);</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> }</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">return</span> count;</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span>}</div>
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</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span>} <span class="comment">// namespace hamming_distance</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span>} <span class="comment">// namespace bit_manipulation</span></div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span></div>
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<div class="foldopen" id="foldopen00076" data-start="{" data-end="}">
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"><a class="line" href="../../d4/d48/hamming__distance_8cpp.html#aa8dca7b867074164d5f45b0f3851269d"> 76</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>() {</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(11, 2) == 2);</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(2, 0) == 1);</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(11, 0) == 3);</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> </div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(<span class="stringliteral">"1101"</span>,</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="stringliteral">"1111"</span>) == 1);</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(<span class="stringliteral">"1111"</span>,</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="stringliteral">"1111"</span>) == 0);</div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(<span class="stringliteral">"0000"</span>,</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="stringliteral">"1111"</span>) == 4);</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> </div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(<span class="stringliteral">"alpha"</span>,</div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="stringliteral">"alphb"</span>) == 1);</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(<span class="stringliteral">"abcd"</span>,</div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="stringliteral">"abcd"</span>) == 0);</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> assert(<a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(<span class="stringliteral">"dcba"</span>,</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="stringliteral">"abcd"</span>) == 4);</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span>}</div>
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</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="../../d4/d48/hamming__distance_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 100</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// execute the tests</span></div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> uint64_t a = 11; <span class="comment">// 1011 in binary</span></div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> uint64_t b = 2; <span class="comment">// 0010 in binary</span></div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> </div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> std::cout << <span class="stringliteral">"Hamming distance between "</span> << a << <span class="stringliteral">" and "</span> << b << <span class="stringliteral">" is "</span></div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> << <a class="code hl_function" href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a>(a, b)</div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> << std::endl;</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span>}</div>
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</div>
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<div class="ttc" id="ahamming__distance_8cpp_html_a65d845df3fecff7087a2126c7b72030b"><div class="ttname"><a href="../../d4/d48/hamming__distance_8cpp.html#a65d845df3fecff7087a2126c7b72030b">bit_manipulation::hamming_distance::bitCount</a></div><div class="ttdeci">uint64_t bitCount(uint64_t value)</div><div class="ttdef"><b>Definition</b> <a href="#l00035">hamming_distance.cpp:35</a></div></div>
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<div class="ttc" id="ahamming__distance_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d4/d48/hamming__distance_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Function to the test hamming distance.</div><div class="ttdef"><b>Definition</b> <a href="#l00076">hamming_distance.cpp:76</a></div></div>
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<div class="ttc" id="ahamming__distance_8cpp_html_abfe6fbb2f3460a2623c96f283178a07a"><div class="ttname"><a href="../../d4/d48/hamming__distance_8cpp.html#abfe6fbb2f3460a2623c96f283178a07a">bit_manipulation::hamming_distance::hamming_distance</a></div><div class="ttdeci">uint64_t hamming_distance(uint64_t a, uint64_t b)</div><div class="ttdef"><b>Definition</b> <a href="#l00052">hamming_distance.cpp:52</a></div></div>
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<div class="ttc" id="ahamming__distance_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d4/d48/hamming__distance_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">Main function.</div><div class="ttdef"><b>Definition</b> <a href="#l00100">hamming_distance.cpp:100</a></div></div>
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<div class="ttc" id="anamespacebit__manipulation_html"><div class="ttname"><a href="../../d7/d81/namespacebit__manipulation.html">bit_manipulation</a></div><div class="ttdoc">for std::string</div></div>
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<div class="ttc" id="anamespacehamming__distance_html"><div class="ttname"><a href="../../d4/d1c/namespacehamming__distance.html">hamming_distance</a></div><div class="ttdoc">Functions for Hamming distance implementation.</div></div>
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