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<div class="headertitle"><div class="title">exponential_search.cpp</div></div>
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<a href="../../d8/d8a/exponential__search_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>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#include &lt;cassert&gt;</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#include &lt;cmath&gt;</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include &lt;cstdint&gt;</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#ifdef _MSC_VER</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include &lt;string&gt;</span> <span class="comment">// use for MS Visual C++</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#else</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#include &lt;cstring&gt;</span> <span class="comment">// for all other compilers</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Type&gt;</div>
<div class="foldopen" id="foldopen00034" data-start="{" data-end="}">
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"><a class="line" href="../../d8/d8a/exponential__search_8cpp.html#ab06cedad209456eae95d37b7cd66acae"> 34</a></span><span class="keyword">inline</span> Type* <a class="code hl_function" href="../../d8/d8a/exponential__search_8cpp.html#ab06cedad209456eae95d37b7cd66acae">binary_s</a>(Type* array, <span class="keywordtype">size_t</span> size, Type key) {</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> int32_t lower_index(0), upper_index(size - 1), middle_index;</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keywordflow">while</span> (lower_index &lt;= upper_index) {</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> middle_index = std::floor((lower_index + upper_index) / 2);</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> </div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordflow">if</span> (*(array + middle_index) &lt; key)</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> lower_index = (middle_index + 1);</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (*(array + middle_index) &gt; key)</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> upper_index = (middle_index - 1);</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keywordflow">return</span> (array + middle_index);</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> }</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span>}</div>
</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="keyword">template</span> &lt;<span class="keyword">class</span> Type&gt;</div>
<div class="foldopen" id="foldopen00059" data-start="{" data-end="}">
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="../../d8/d8a/exponential__search_8cpp.html#af421bf4b7b95f20ac86c233adfdb9208"> 59</a></span>Type* <a class="code hl_function" href="../../d8/d8a/exponential__search_8cpp.html#af421bf4b7b95f20ac86c233adfdb9208">struzik_search</a>(Type* array, <span class="keywordtype">size_t</span> size, Type key) {</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> uint32_t block_front(0), block_size = size == 0 ? 0 : 1;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordflow">while</span> (block_front != block_size) {</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">if</span> (*(array + block_size - 1) &lt; key) {</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> block_front = block_size;</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> (block_size * 2 - 1 &lt; size) ? (block_size *= 2) : block_size = size;</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keywordflow">continue</span>;</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> }</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">return</span> <a class="code hl_function" href="../../d8/d8a/exponential__search_8cpp.html#ab06cedad209456eae95d37b7cd66acae">binary_s&lt;Type&gt;</a>(array + block_front, (block_size - block_front),</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> key);</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> }</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span>}</div>
</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="foldopen" id="foldopen00074" data-start="{" data-end="}">
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"><a class="line" href="../../d8/d8a/exponential__search_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 74</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d8/d8a/exponential__search_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// TEST CASES</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="keywordtype">int</span>* sorted_array = <span class="keyword">new</span> <span class="keywordtype">int</span>[7]{7, 10, 15, 23, 70, 105, 203};</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> assert(<a class="code hl_function" href="../../d8/d8a/exponential__search_8cpp.html#af421bf4b7b95f20ac86c233adfdb9208">struzik_search&lt;int&gt;</a>(sorted_array, 7, 0) == <span class="keyword">nullptr</span>);</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> assert(<a class="code hl_function" href="../../d8/d8a/exponential__search_8cpp.html#af421bf4b7b95f20ac86c233adfdb9208">struzik_search&lt;int&gt;</a>(sorted_array, 7, 1000) == <span class="keyword">nullptr</span>);</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> assert(<a class="code hl_function" href="../../d8/d8a/exponential__search_8cpp.html#af421bf4b7b95f20ac86c233adfdb9208">struzik_search&lt;int&gt;</a>(sorted_array, 7, 50) == <span class="keyword">nullptr</span>);</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> assert(<a class="code hl_function" href="../../d8/d8a/exponential__search_8cpp.html#af421bf4b7b95f20ac86c233adfdb9208">struzik_search&lt;int&gt;</a>(sorted_array, 7, 7) == sorted_array);</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// TEST CASES</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keyword">delete</span>[] sorted_array;</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span>}</div>
</div>
<div class="ttc" id="aexponential__search_8cpp_html_ab06cedad209456eae95d37b7cd66acae"><div class="ttname"><a href="../../d8/d8a/exponential__search_8cpp.html#ab06cedad209456eae95d37b7cd66acae">binary_s</a></div><div class="ttdeci">Type * binary_s(Type *array, size_t size, Type key)</div><div class="ttdef"><b>Definition</b> <a href="#l00034">exponential_search.cpp:34</a></div></div>
<div class="ttc" id="aexponential__search_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d8/d8a/exponential__search_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition</b> <a href="#l00074">exponential_search.cpp:74</a></div></div>
<div class="ttc" id="aexponential__search_8cpp_html_af421bf4b7b95f20ac86c233adfdb9208"><div class="ttname"><a href="../../d8/d8a/exponential__search_8cpp.html#af421bf4b7b95f20ac86c233adfdb9208">struzik_search</a></div><div class="ttdeci">Type * struzik_search(Type *array, size_t size, Type key)</div><div class="ttdef"><b>Definition</b> <a href="#l00059">exponential_search.cpp:59</a></div></div>
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