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<p>Implementation for [LRU Cache] (<a href="https://en.wikipedia.org/wiki/Cache_replacement_policies#:~:text=Least%20Recently%20Used%20(LRU)">https://en.wikipedia.org/wiki/Cache_replacement_policies#:~:text=Least%20Recently%20Used%20(LRU)</a>)
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;cstdint&gt;</code><br />
<code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;unordered_map&gt;</code><br />
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Include dependency graph for lru_cache2.cpp:</div>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../de/d21/classothers_1_1_cache_1_1_d___node.html">others::Cache::D_Node&lt; T &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight"><a class="el" href="../../db/d8b/struct_node.html">Node</a> for a doubly linked list with data, prev and next pointers. <a href="../../de/d21/classothers_1_1_cache_1_1_d___node.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d8/d2e/classothers_1_1_cache_1_1_l_r_u_cache.html">others::Cache::LRUCache&lt; K, V &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight"><a class="el" href="../../d8/d2e/classothers_1_1_cache_1_1_l_r_u_cache.html" title="LRUCache.">LRUCache</a>. <a href="../../d8/d2e/classothers_1_1_cache_1_1_l_r_u_cache.html#details">More...</a><br /></td></tr>
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<tr class="memdesc:d0/d6f/namespaceothers"><td class="mdescLeft">&#160;</td><td class="mdescRight">for <code>vector</code> <br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">namespace &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../db/dde/namespaceothers_1_1_cache.html">others::Cache</a></td></tr>
<tr class="memdesc:db/dde/namespaceothers_1_1_cache"><td class="mdescLeft">&#160;</td><td class="mdescRight"><a class="el" href="../../db/dde/namespaceothers_1_1_cache.html" title="Cache algorithm.">Cache</a> algorithm. <br /></td></tr>
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<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d" id="r_aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft">&#160;</td><td class="mdescRight">self test implementations <br /></td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4" id="r_ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">main function <br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Implementation for [LRU Cache] (<a href="https://en.wikipedia.org/wiki/Cache_replacement_policies#:~:text=Least%20Recently%20Used%20(LRU)">https://en.wikipedia.org/wiki/Cache_replacement_policies#:~:text=Least%20Recently%20Used%20(LRU)</a>) </p>
<p>LRU discards the least recently used value. Data structures used - doubly linked list and unordered_map</p>
<p>unordered_map maps the key to the address of the node of the linked list. If the element is accessed, the element is moved to the beginning of the linked list.</p>
<p>When the cache is full, the last element in the linked list is popped.</p>
<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/deDSeC00720" target="_blank">Karan Sharma</a> </dd></dl>
</div><h2 class="groupheader">Function Documentation</h2>
<a id="ae66f6b31b5ad750f1fe042a706a4e3d4" name="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
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<p>main function </p>
<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 274</span> {</div>
<div class="line"><span class="lineno"> 275</span> <a class="code hl_function" href="#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run the self test implementation</span></div>
<div class="line"><span class="lineno"> 276</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 277</span>}</div>
<div class="ttc" id="alru__cache2_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">self test implementations</div><div class="ttdef"><b>Definition</b> lru_cache2.cpp:220</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#aa8dca7b867074164d5f45b0f3851269d">&#9670;&#160;</a></span>test()</h2>
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<td class="memname">static void test </td>
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<p>self test implementations </p>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 220</span> {</div>
<div class="line"><span class="lineno"> 221</span> <a class="code hl_class" href="../../d8/d2e/classothers_1_1_cache_1_1_l_r_u_cache.html">others::Cache::LRUCache&lt;int, int&gt;</a> cache(5);</div>
<div class="line"><span class="lineno"> 222</span> </div>
<div class="line"><span class="lineno"> 223</span> <span class="comment">// test the initial state of the cache</span></div>
<div class="line"><span class="lineno"> 224</span> assert(cache.size() == 0);</div>
<div class="line"><span class="lineno"> 225</span> assert(cache.capacity() == 5);</div>
<div class="line"><span class="lineno"> 226</span> assert(cache.empty());</div>
<div class="line"><span class="lineno"> 227</span> </div>
<div class="line"><span class="lineno"> 228</span> <span class="comment">// test insertion in the cache</span></div>
<div class="line"><span class="lineno"> 229</span> cache.put(1, 10);</div>
<div class="line"><span class="lineno"> 230</span> cache.put(-2, 20);</div>
<div class="line"><span class="lineno"> 231</span> </div>
<div class="line"><span class="lineno"> 232</span> <span class="comment">// test the state of cache after inserting some items</span></div>
<div class="line"><span class="lineno"> 233</span> assert(cache.size() == 2);</div>
<div class="line"><span class="lineno"> 234</span> assert(cache.capacity() == 5);</div>
<div class="line"><span class="lineno"> 235</span> assert(!cache.empty());</div>
<div class="line"><span class="lineno"> 236</span> </div>
<div class="line"><span class="lineno"> 237</span> <span class="comment">// test getting items from the cache</span></div>
<div class="line"><span class="lineno"> 238</span> assert(cache.get(1) == 10);</div>
<div class="line"><span class="lineno"> 239</span> assert(cache.get(-2) == 20);</div>
<div class="line"><span class="lineno"> 240</span> </div>
<div class="line"><span class="lineno"> 241</span> cache.put(-3, -30);</div>
<div class="line"><span class="lineno"> 242</span> cache.put(4, 40);</div>
<div class="line"><span class="lineno"> 243</span> cache.put(5, -50);</div>
<div class="line"><span class="lineno"> 244</span> cache.put(6, 60);</div>
<div class="line"><span class="lineno"> 245</span> </div>
<div class="line"><span class="lineno"> 246</span> <span class="comment">// test the state after inserting more items than the capacity</span></div>
<div class="line"><span class="lineno"> 247</span> assert(cache.size() == 5);</div>
<div class="line"><span class="lineno"> 248</span> assert(cache.capacity() == 5);</div>
<div class="line"><span class="lineno"> 249</span> assert(!cache.empty());</div>
<div class="line"><span class="lineno"> 250</span> </div>
<div class="line"><span class="lineno"> 251</span> <span class="comment">// fetching 1 throws runtime_error</span></div>
<div class="line"><span class="lineno"> 252</span> <span class="comment">// as 1 was evicted being the least recently used</span></div>
<div class="line"><span class="lineno"> 253</span> <span class="comment">// when 6 was added</span></div>
<div class="line"><span class="lineno"> 254</span> <span class="keywordflow">try</span> {</div>
<div class="line"><span class="lineno"> 255</span> cache.get(1);</div>
<div class="line"><span class="lineno"> 256</span> } <span class="keywordflow">catch</span> (<span class="keyword">const</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/error/runtime_error.html">std::runtime_error</a> &amp;e) {</div>
<div class="line"><span class="lineno"> 257</span> assert(<a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a>(e.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/error/exception/what.html">what</a>()) == <span class="stringliteral">&quot;key is not present in the cache&quot;</span>);</div>
<div class="line"><span class="lineno"> 258</span> }</div>
<div class="line"><span class="lineno"> 259</span> </div>
<div class="line"><span class="lineno"> 260</span> <span class="comment">// test retrieval of all items in the cache</span></div>
<div class="line"><span class="lineno"> 261</span> assert(cache.get(-2) == 20);</div>
<div class="line"><span class="lineno"> 262</span> assert(cache.get(-3) == -30);</div>
<div class="line"><span class="lineno"> 263</span> assert(cache.get(4) == 40);</div>
<div class="line"><span class="lineno"> 264</span> assert(cache.get(5) == -50);</div>
<div class="line"><span class="lineno"> 265</span> assert(cache.get(6) == 60);</div>
<div class="line"><span class="lineno"> 266</span> </div>
<div class="line"><span class="lineno"> 267</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> &lt;&lt; <span class="stringliteral">&quot;test - passed\n&quot;</span>;</div>
<div class="line"><span class="lineno"> 268</span>}</div>
<div class="ttc" id="abasic_ostream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a></div></div>
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