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<div class="headertitle"><div class="title">lfu_cache.cpp</div></div>
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<a href="../../d9/d65/lfu__cache_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="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="preprocessor">#include &lt;cassert&gt;</span> <span class="comment">// for assert</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include &lt;iostream&gt;</span> <span class="comment">// for std::cout</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include &lt;unordered_map&gt;</span> <span class="comment">// for std::unordered_map</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d0/d6f/namespaceothers.html">others</a> {</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span></div>
<div class="foldopen" id="foldopen00037" data-start="{" data-end="}">
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"><a class="line" href="../../db/dde/namespaceothers_1_1_cache.html"> 37</a></span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../db/dde/namespaceothers_1_1_cache.html">Cache</a> {</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="foldopen" id="foldopen00045" data-start="{" data-end="};">
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"><a class="line" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html"> 45</a></span><span class="keyword">class </span>D_Node {</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">public</span>:</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"><a class="line" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a8902e7ff872fa3c80fe6ce5f5cf5cc75"> 47</a></span> T <a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a8902e7ff872fa3c80fe6ce5f5cf5cc75">data</a>; </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"><a class="line" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a19e954cbb710ea8318bcb6aaef78e2d5"> 48</a></span> D_Node&lt;T&gt; *<a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a19e954cbb710ea8318bcb6aaef78e2d5">prev</a>; </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"><a class="line" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a0043eb287c54b3b2fb91ce354878a7bd"> 49</a></span> D_Node&lt;T&gt; *<a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a0043eb287c54b3b2fb91ce354878a7bd">next</a>; </div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">explicit</span> D_Node(T <a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a8902e7ff872fa3c80fe6ce5f5cf5cc75">data</a>) : <a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a8902e7ff872fa3c80fe6ce5f5cf5cc75">data</a>(<a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a8902e7ff872fa3c80fe6ce5f5cf5cc75">data</a>), <a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a19e954cbb710ea8318bcb6aaef78e2d5">prev</a>(nullptr), <a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a0043eb287c54b3b2fb91ce354878a7bd">next</a>(nullptr) {}</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span>};</div>
</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> K, <span class="keyword">typename</span> V&gt;</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="keyword">using </span>CacheNode = D_Node&lt;std::pair&lt;K, V&gt;&gt;;</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> K, <span class="keyword">typename</span> V&gt;</div>
<div class="foldopen" id="foldopen00064" data-start="{" data-end="};">
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html"> 64</a></span><span class="keyword">class </span><a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#affd7776c246caa2d0f92fd8616f6e5dc">LFUCache</a> {</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> std::unordered_map&lt;K, std::pair&lt;CacheNode&lt;K, V&gt; *, <span class="keywordtype">int</span>&gt;&gt;</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35"> 66</a></span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>; </div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> std::unordered_map&lt;int, std::pair&lt;CacheNode&lt;K, V&gt; *, CacheNode&lt;K, V&gt; *&gt;&gt;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2"> 68</a></span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>; </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"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285"> 70</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">minFreq</a>; </div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a3acc10e6bb67d9d9c4187f625723e6c5"> 71</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a3acc10e6bb67d9d9c4187f625723e6c5">_capacity</a>; </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">public</span>:</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#affd7776c246caa2d0f92fd8616f6e5dc"> 78</a></span> <span class="keyword">explicit</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#affd7776c246caa2d0f92fd8616f6e5dc">LFUCache</a>(<span class="keywordtype">int</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a3acc10e6bb67d9d9c4187f625723e6c5">_capacity</a>) : <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">minFreq</a>(0), <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a3acc10e6bb67d9d9c4187f625723e6c5">_capacity</a>(<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a3acc10e6bb67d9d9c4187f625723e6c5">_capacity</a>) {}</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">private</span>:</div>
<div class="foldopen" id="foldopen00088" data-start="{" data-end="}">
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adad4ab43141fb8ba43facd3a71e07047"> 88</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adad4ab43141fb8ba43facd3a71e07047">push</a>(<span class="keywordtype">int</span> freq, CacheNode&lt;K, V&gt; *<a class="code hl_class" href="../../d5/da1/structnode.html">node</a>) {</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="comment">// if freq is not present, then make a new list with node as the head as</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="comment">// well as tail.</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="keywordflow">if</span> (!<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>.count(freq)) {</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>[freq] = {<a class="code hl_class" href="../../d5/da1/structnode.html">node</a>, <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>};</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> }</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> </div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> std::pair&lt;CacheNode&lt;K, V&gt; *, CacheNode&lt;K, V&gt; *&gt; &amp;p = <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>[freq];</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> </div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="comment">// insert the node at the beginning of the linked list and update the</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="comment">// head.</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> p.first-&gt;prev = <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>-&gt;next = p.first;</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> p.first = <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>;</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> }</div>
</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span></div>
<div class="foldopen" id="foldopen00109" data-start="{" data-end="}">
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a16a25c102554c5653721a5112ef676c9"> 109</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a16a25c102554c5653721a5112ef676c9">increase_frequency</a>(std::pair&lt;CacheNode&lt;K, V&gt; *, <span class="keywordtype">int</span>&gt; &amp;p_node) {</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> CacheNode&lt;K, V&gt; *<a class="code hl_class" href="../../d5/da1/structnode.html">node</a> = p_node.first;</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="keywordtype">int</span> freq = p_node.second;</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> std::pair&lt;CacheNode&lt;K, V&gt; *, CacheNode&lt;K, V&gt; *&gt; &amp;p = <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>[freq];</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> </div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <span class="comment">// if the given node is the only node in the list,</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="comment">// then erase the frequency from map</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <span class="comment">// and increase minFreq by 1.</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> <span class="keywordflow">if</span> (p.first == <a class="code hl_class" href="../../d5/da1/structnode.html">node</a> &amp;&amp; p.second == <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>) {</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>.erase(freq);</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <span class="keywordflow">if</span> (<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">minFreq</a> == freq) {</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">minFreq</a> = freq + 1;</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> }</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="comment">// remove the given node from current freq linked list</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> CacheNode&lt;K, V&gt; *prev = <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>-&gt;prev;</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> CacheNode&lt;K, V&gt; *next = <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>-&gt;next;</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>-&gt;prev = <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>-&gt;next = <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> </div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="keywordflow">if</span> (prev) {</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> prev-&gt;<a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a0043eb287c54b3b2fb91ce354878a7bd">next</a> = next;</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> p.first = next;</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> }</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> </div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> <span class="keywordflow">if</span> (next) {</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> next-&gt;<a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a19e954cbb710ea8318bcb6aaef78e2d5">prev</a> = prev;</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> p.second = prev;</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> }</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> }</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adad4ab43141fb8ba43facd3a71e07047">push</a>(freq + 1, <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>);</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> ++p_node.second;</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> }</div>
</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span></div>
<div class="foldopen" id="foldopen00149" data-start="{" data-end="}">
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ab3561ab204754295199f9566924f7e69"> 149</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ab3561ab204754295199f9566924f7e69">pop</a>() {</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> std::pair&lt;CacheNode&lt;K, V&gt; *, CacheNode&lt;K, V&gt; *&gt; &amp;p = <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>[<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">minFreq</a>];</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> </div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="comment">// if there is only one node</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> <span class="comment">// remove the node and erase</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <span class="comment">// the frequency from freq_map</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> <span class="keywordflow">if</span> (p.first == p.second) {</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="keyword">delete</span> p.first;</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>.erase(<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">minFreq</a>);</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> }</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> </div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <span class="comment">// remove the last node in the linked list</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> CacheNode&lt;K, V&gt; *temp = p.second;</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> p.second = temp-&gt;<a class="code hl_variable" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a19e954cbb710ea8318bcb6aaef78e2d5">prev</a>;</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> p.second-&gt;next = <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> <span class="keyword">delete</span> temp;</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> }</div>
</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> <span class="keyword">public</span>:</div>
<div class="foldopen" id="foldopen00174" data-start="{" data-end="}">
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e"> 174</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e">put</a>(K key, V value) {</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> <span class="comment">// update the value if key already exists</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> <span class="keywordflow">if</span> (<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>.count(key)) {</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>[key].first-&gt;data.second = value;</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a16a25c102554c5653721a5112ef676c9">increase_frequency</a>(<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>[key]);</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> }</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> </div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> <span class="comment">// if the cache is full</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> <span class="comment">// remove the least frequently used item</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> <span class="keywordflow">if</span> (<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>.size() == <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a3acc10e6bb67d9d9c4187f625723e6c5">_capacity</a>) {</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>.erase(<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">freq_map</a>[<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">minFreq</a>].second-&gt;data.first);</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ab3561ab204754295199f9566924f7e69">pop</a>();</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> }</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> <span class="comment">// insert the new node and set minFreq to 1</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> CacheNode&lt;K, V&gt; *<a class="code hl_class" href="../../d5/da1/structnode.html">node</a> = <span class="keyword">new</span> CacheNode&lt;K, V&gt;({key, value});</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>[key] = {<a class="code hl_class" href="../../d5/da1/structnode.html">node</a>, 1};</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">minFreq</a> = 1;</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adad4ab43141fb8ba43facd3a71e07047">push</a>(1, <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>);</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> }</div>
</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span></div>
<div class="foldopen" id="foldopen00202" data-start="{" data-end="}">
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781"> 202</a></span> V <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">get</a>(K key) {</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> <span class="keywordflow">if</span> (!<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>.count(key)) {</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> <span class="keywordflow">throw</span> std::runtime_error(<span class="stringliteral">&quot;key is not present in the cache&quot;</span>);</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> }</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> </div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> <span class="comment">// increase the frequency and return the value</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> V value = <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>[key].first-&gt;data.second;</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a16a25c102554c5653721a5112ef676c9">increase_frequency</a>(<a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>[key]);</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> <span class="keywordflow">return</span> value;</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> }</div>
</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adbfb2ef7358423fdf1f49d410f55f195"> 217</a></span> <span class="keywordtype">int</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adbfb2ef7358423fdf1f49d410f55f195">size</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>.size(); }</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac27c9076377cbed2a2acc45a189fed2c"> 223</a></span> <span class="keywordtype">int</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac27c9076377cbed2a2acc45a189fed2c">capacity</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a3acc10e6bb67d9d9c4187f625723e6c5">_capacity</a>; }</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a68e1be0a3e0a6478aa35f04000e0e9b0"> 229</a></span> <span class="keywordtype">bool</span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a68e1be0a3e0a6478aa35f04000e0e9b0">empty</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>.empty(); }</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span></div>
<div class="foldopen" id="foldopen00235" data-start="{" data-end="}">
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"><a class="line" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a8857531ecc8ed2e36868e267148eff36"> 235</a></span> <a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a8857531ecc8ed2e36868e267148eff36">~LFUCache</a>() {</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span> <span class="keyword">auto</span> it = <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>.begin();</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span> <span class="keywordflow">while</span> (it != <a class="code hl_variable" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">node_map</a>.end()) {</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span> <span class="keyword">delete</span> it-&gt;second.first;</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span> ++it;</div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"> 240</span> }</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span> }</div>
</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span>};</div>
</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span>} <span class="comment">// namespace Cache</span></div>
</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span>} <span class="comment">// namespace others</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span></div>
<div class="foldopen" id="foldopen00250" data-start="{" data-end="}">
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"><a class="line" href="../../d9/d65/lfu__cache_8cpp.html#aa8dca7b867074164d5f45b0f3851269d"> 250</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../d9/d65/lfu__cache_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>() {</div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span> <a class="code hl_class" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html">others::Cache::LFUCache&lt;int, int&gt;</a> cache(5);</div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span> </div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span> <span class="comment">// test the initial state of the cache</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno"> 254</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adbfb2ef7358423fdf1f49d410f55f195">size</a>() == 0);</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno"> 255</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac27c9076377cbed2a2acc45a189fed2c">capacity</a>() == 5);</div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno"> 256</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a68e1be0a3e0a6478aa35f04000e0e9b0">empty</a>());</div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno"> 257</span> </div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"> 258</span> <span class="comment">// test insertion in the cache</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"> 259</span> cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e">put</a>(1, 10);</div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno"> 260</span> cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e">put</a>(-2, 20);</div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"> 261</span> </div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"> 262</span> <span class="comment">// test the state of cache after inserting some items</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adbfb2ef7358423fdf1f49d410f55f195">size</a>() == 2);</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac27c9076377cbed2a2acc45a189fed2c">capacity</a>() == 5);</div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno"> 265</span> assert(!cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a68e1be0a3e0a6478aa35f04000e0e9b0">empty</a>());</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span> </div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span> <span class="comment">// test getting items from the cache</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">get</a>(1) == 10);</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">get</a>(-2) == 20);</div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span> </div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span> cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e">put</a>(-3, -30);</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span> cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e">put</a>(4, 40);</div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span> cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e">put</a>(5, -50);</div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span> cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e">put</a>(6, 60);</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"> 275</span> </div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno"> 276</span> <span class="comment">// test the state after inserting more items than the capacity</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"> 277</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adbfb2ef7358423fdf1f49d410f55f195">size</a>() == 5);</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac27c9076377cbed2a2acc45a189fed2c">capacity</a>() == 5);</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span> assert(!cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a68e1be0a3e0a6478aa35f04000e0e9b0">empty</a>());</div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span> </div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span> <span class="comment">// test retrieval of all items in the cache</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">get</a>(1) == 10);</div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">get</a>(-2) == 20);</div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span> </div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span> <span class="comment">// fetching -3 throws runtime_error</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span> <span class="comment">// as -3 was evicted being the least frequently used</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span> <span class="comment">// when 6 was added</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span> <span class="comment">// assert(cache.get(-3) == -30);</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span> </div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">get</a>(4) == 40);</div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">get</a>(5) == -50);</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span> assert(cache.<a class="code hl_function" href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">get</a>(6) == 60);</div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span> </div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span> std::cout &lt;&lt; <span class="stringliteral">&quot;test - passed\n&quot;</span>;</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span>}</div>
</div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span></div>
<div class="foldopen" id="foldopen00301" data-start="{" data-end="}">
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"><a class="line" href="../../d9/d65/lfu__cache_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 301</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d9/d65/lfu__cache_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span> <a class="code hl_function" href="../../d9/d65/lfu__cache_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run the self test implementation</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span>}</div>
</div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_d___node_html_a0043eb287c54b3b2fb91ce354878a7bd"><div class="ttname"><a href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a0043eb287c54b3b2fb91ce354878a7bd">others::Cache::D_Node&lt; std::pair&lt; K, V &gt; &gt;::next</a></div><div class="ttdeci">D_Node&lt; std::pair&lt; K, V &gt; &gt; * next</div><div class="ttdef"><b>Definition</b> <a href="#l00049">lfu_cache.cpp:49</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_d___node_html_a19e954cbb710ea8318bcb6aaef78e2d5"><div class="ttname"><a href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a19e954cbb710ea8318bcb6aaef78e2d5">others::Cache::D_Node&lt; std::pair&lt; K, V &gt; &gt;::prev</a></div><div class="ttdeci">D_Node&lt; std::pair&lt; K, V &gt; &gt; * prev</div><div class="ttdef"><b>Definition</b> <a href="#l00048">lfu_cache.cpp:48</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_d___node_html_a8902e7ff872fa3c80fe6ce5f5cf5cc75"><div class="ttname"><a href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#a8902e7ff872fa3c80fe6ce5f5cf5cc75">others::Cache::D_Node&lt; std::pair&lt; K, V &gt; &gt;::data</a></div><div class="ttdeci">std::pair&lt; K, V &gt; data</div><div class="ttdef"><b>Definition</b> <a href="#l00047">lfu_cache.cpp:47</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html">others::Cache::LFUCache</a></div><div class="ttdoc">LFUCache.</div><div class="ttdef"><b>Definition</b> <a href="#l00064">lfu_cache.cpp:64</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_a16a25c102554c5653721a5112ef676c9"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a16a25c102554c5653721a5112ef676c9">others::Cache::LFUCache::increase_frequency</a></div><div class="ttdeci">void increase_frequency(std::pair&lt; CacheNode&lt; K, V &gt; *, int &gt; &amp;p_node)</div><div class="ttdoc">increase the frequency of node and push it in the respective list.</div><div class="ttdef"><b>Definition</b> <a href="#l00109">lfu_cache.cpp:109</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_a3acc10e6bb67d9d9c4187f625723e6c5"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a3acc10e6bb67d9d9c4187f625723e6c5">others::Cache::LFUCache::_capacity</a></div><div class="ttdeci">int _capacity</div><div class="ttdoc">maximum capacity of the cache</div><div class="ttdef"><b>Definition</b> <a href="#l00071">lfu_cache.cpp:71</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_a58e37d3713f28d36abbb8cdf6c432781"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a58e37d3713f28d36abbb8cdf6c432781">others::Cache::LFUCache::get</a></div><div class="ttdeci">V get(K key)</div><div class="ttdoc">get the value of the key-value pair if exists</div><div class="ttdef"><b>Definition</b> <a href="#l00202">lfu_cache.cpp:202</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_a68e1be0a3e0a6478aa35f04000e0e9b0"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a68e1be0a3e0a6478aa35f04000e0e9b0">others::Cache::LFUCache::empty</a></div><div class="ttdeci">bool empty() const</div><div class="ttdoc">returns true if the cache is empty, false otherwise.</div><div class="ttdef"><b>Definition</b> <a href="#l00229">lfu_cache.cpp:229</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_a6de844d1589a809239cc07752f311285"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a6de844d1589a809239cc07752f311285">others::Cache::LFUCache::minFreq</a></div><div class="ttdeci">int minFreq</div><div class="ttdoc">minimum frequency in the cache</div><div class="ttdef"><b>Definition</b> <a href="#l00070">lfu_cache.cpp:70</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_a8857531ecc8ed2e36868e267148eff36"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#a8857531ecc8ed2e36868e267148eff36">others::Cache::LFUCache::~LFUCache</a></div><div class="ttdeci">~LFUCache()</div><div class="ttdoc">destructs the cache, iterates on the map and deletes every node present in the cache.</div><div class="ttdef"><b>Definition</b> <a href="#l00235">lfu_cache.cpp:235</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_ab3561ab204754295199f9566924f7e69"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ab3561ab204754295199f9566924f7e69">others::Cache::LFUCache::pop</a></div><div class="ttdeci">void pop()</div><div class="ttdoc">pop the last node in the least frequently used linked list</div><div class="ttdef"><b>Definition</b> <a href="#l00149">lfu_cache.cpp:149</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_aba5d59d0f6ab0c0d30a92551ca5a05f2"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#aba5d59d0f6ab0c0d30a92551ca5a05f2">others::Cache::LFUCache::freq_map</a></div><div class="ttdeci">std::unordered_map&lt; int, std::pair&lt; CacheNode&lt; K, V &gt; *, CacheNode&lt; K, V &gt; * &gt; &gt; freq_map</div><div class="ttdoc">maps the frequency to doubly linked list</div><div class="ttdef"><b>Definition</b> <a href="#l00068">lfu_cache.cpp:68</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_ac27c9076377cbed2a2acc45a189fed2c"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac27c9076377cbed2a2acc45a189fed2c">others::Cache::LFUCache::capacity</a></div><div class="ttdeci">int capacity() const</div><div class="ttdoc">Returns the total capacity of the cache.</div><div class="ttdef"><b>Definition</b> <a href="#l00223">lfu_cache.cpp:223</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_ac7684879e2e5da3d8bc5b1699ee42d35"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#ac7684879e2e5da3d8bc5b1699ee42d35">others::Cache::LFUCache::node_map</a></div><div class="ttdeci">std::unordered_map&lt; K, std::pair&lt; CacheNode&lt; K, V &gt; *, int &gt; &gt; node_map</div><div class="ttdoc">maps the key to the node address and frequency</div><div class="ttdef"><b>Definition</b> <a href="#l00066">lfu_cache.cpp:66</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_adad4ab43141fb8ba43facd3a71e07047"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adad4ab43141fb8ba43facd3a71e07047">others::Cache::LFUCache::push</a></div><div class="ttdeci">void push(int freq, CacheNode&lt; K, V &gt; *node)</div><div class="ttdoc">push the node at first position in the linked list of given frequency</div><div class="ttdef"><b>Definition</b> <a href="#l00088">lfu_cache.cpp:88</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_adbfb2ef7358423fdf1f49d410f55f195"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#adbfb2ef7358423fdf1f49d410f55f195">others::Cache::LFUCache::size</a></div><div class="ttdeci">int size() const</div><div class="ttdoc">Returns the number of items present in the cache.</div><div class="ttdef"><b>Definition</b> <a href="#l00217">lfu_cache.cpp:217</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_af6f8e5a66a45436b490dfe015ff8866e"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#af6f8e5a66a45436b490dfe015ff8866e">others::Cache::LFUCache::put</a></div><div class="ttdeci">void put(K key, V value)</div><div class="ttdoc">upsert a key-value pair</div><div class="ttdef"><b>Definition</b> <a href="#l00174">lfu_cache.cpp:174</a></div></div>
<div class="ttc" id="aclassothers_1_1_cache_1_1_l_f_u_cache_html_affd7776c246caa2d0f92fd8616f6e5dc"><div class="ttname"><a href="../../df/d8f/classothers_1_1_cache_1_1_l_f_u_cache.html#affd7776c246caa2d0f92fd8616f6e5dc">others::Cache::LFUCache::LFUCache</a></div><div class="ttdeci">LFUCache(int _capacity)</div><div class="ttdoc">Constructor, Initialize with minFreq and _capacity.</div><div class="ttdef"><b>Definition</b> <a href="#l00078">lfu_cache.cpp:78</a></div></div>
<div class="ttc" id="alfu__cache_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d9/d65/lfu__cache_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">self test implementation</div><div class="ttdef"><b>Definition</b> <a href="#l00250">lfu_cache.cpp:250</a></div></div>
<div class="ttc" id="alfu__cache_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d9/d65/lfu__cache_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="#l00301">lfu_cache.cpp:301</a></div></div>
<div class="ttc" id="anamespaceothers_1_1_cache_html"><div class="ttname"><a href="../../db/dde/namespaceothers_1_1_cache.html">others::Cache</a></div><div class="ttdoc">Cache algorithm.</div><div class="ttdef"><b>Definition</b> <a href="#l00037">lfu_cache.cpp:37</a></div></div>
<div class="ttc" id="anamespaceothers_html"><div class="ttname"><a href="../../d0/d6f/namespaceothers.html">others</a></div><div class="ttdoc">for vector</div></div>
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