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<tr class="memdesc:a6af57e9f25d0d0a2d59eea5a4a802908"><td class="mdescLeft">&#160;</td><td class="mdescRight">constructor to initialise the root of the trie. <br /></td></tr>
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<tr class="memitem:afd8b79959009b554e98ea7128b2886f2"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d2f/class_trie.html#afd8b79959009b554e98ea7128b2886f2">insert</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;word)</td></tr>
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<tr class="memitem:a734a08b52b8ad73bdd1f36ae8348056e"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d2f/class_trie.html#a734a08b52b8ad73bdd1f36ae8348056e">removeWord</a> (const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;word)</td></tr>
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<tr class="memitem:a6d10eb1669453395d1900ebd401954fb"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb">hasChildren</a> (<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr</a>&lt; <a class="el" href="../../de/d48/struct_trie_1_1_trie_node.html">TrieNode</a> &gt; <a class="el" href="../../d5/da1/structnode.html">node</a>)</td></tr>
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<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr</a>&lt; <a class="el" href="../../de/d48/struct_trie_1_1_trie_node.html">TrieNode</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><b>m_root</b></td></tr>
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static constexpr size_t&#160;</td><td class="memItemRight" valign="bottom"><b>ALPHABETS</b> = 26</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A basic implementation of trie class to store only lower-case strings. You can extend the implementation to all the ASCII characters by changing the value of @ ALPHABETS to 128. </p>
</div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a6af57e9f25d0d0a2d59eea5a4a802908">&#9670;&#160;</a></span>Trie()</h2>
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<td class="memname">Trie::Trie </td>
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<p>constructor to initialise the root of the trie. </p>
<div class="fragment"><div class="line"><span class="lineno"> 103</span>: m_root(std::make_shared&lt;TrieNode&gt;()) {}</div>
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<h2 class="groupheader">Member Function Documentation</h2>
<a id="a6d10eb1669453395d1900ebd401954fb" name="a6d10eb1669453395d1900ebd401954fb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a6d10eb1669453395d1900ebd401954fb">&#9670;&#160;</a></span>hasChildren()</h2>
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<td class="memname">static bool Trie::hasChildren </td>
<td>(</td>
<td class="paramtype"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr</a>&lt; <a class="el" href="../../de/d48/struct_trie_1_1_trie_node.html">TrieNode</a> &gt;&#160;</td>
<td class="paramname"><em>node</em></td><td>)</td>
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<p>Function to check if a node has some children which can form words. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">node</td><td>whose character array of pointers need to be checked for children. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>true</code> if a child is found </dd>
<dd>
<code>false</code> if a child is not found </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 41</span> {</div>
<div class="line"><span class="lineno"> 42</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; ALPHABETS; i++) {</div>
<div class="line"><span class="lineno"> 43</span> <span class="keywordflow">if</span> (<a class="code hl_class" href="../../d5/da1/structnode.html">node</a>-&gt;character[i]) {</div>
<div class="line"><span class="lineno"> 44</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 45</span> }</div>
<div class="line"><span class="lineno"> 46</span> }</div>
<div class="line"><span class="lineno"> 47</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 48</span> }</div>
<div class="ttc" id="astructnode_html"><div class="ttname"><a href="../../d5/da1/structnode.html">node</a></div><div class="ttdef"><b>Definition:</b> avltree.cpp:13</div></div>
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<a id="afd8b79959009b554e98ea7128b2886f2" name="afd8b79959009b554e98ea7128b2886f2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#afd8b79959009b554e98ea7128b2886f2">&#9670;&#160;</a></span>insert()</h2>
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<td class="memname">void Trie::insert </td>
<td>(</td>
<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;&#160;</td>
<td class="paramname"><em>word</em></td><td>)</td>
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<p>Insert a word into the trie. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">word</td><td>which needs to be inserted into the string. </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><span class="lineno"> 109</span> {</div>
<div class="line"><span class="lineno"> 110</span> <span class="keyword">auto</span> curr = m_root;</div>
<div class="line"><span class="lineno"> 111</span> <span class="keywordflow">for</span> (<span class="keywordtype">char</span> ch : word) {</div>
<div class="line"><span class="lineno"> 112</span> <span class="keywordtype">size_t</span> index = ch - <span class="charliteral">&#39;a&#39;</span>;</div>
<div class="line"><span class="lineno"> 113</span> </div>
<div class="line"><span class="lineno"> 114</span> <span class="comment">// if a node for current word is not already present in trie, create</span></div>
<div class="line"><span class="lineno"> 115</span> <span class="comment">// a new node for it.</span></div>
<div class="line"><span class="lineno"> 116</span> <span class="keywordflow">if</span> (!curr-&gt;character[index]) {</div>
<div class="line"><span class="lineno"> 117</span> curr-&gt;character[index] = std::make_shared&lt;TrieNode&gt;();</div>
<div class="line"><span class="lineno"> 118</span> }</div>
<div class="line"><span class="lineno"> 119</span> </div>
<div class="line"><span class="lineno"> 120</span> curr = curr-&gt;character[index];</div>
<div class="line"><span class="lineno"> 121</span> }</div>
<div class="line"><span class="lineno"> 122</span> curr-&gt;isEndOfWord = <span class="keyword">true</span>;</div>
<div class="line"><span class="lineno"> 123</span> }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a734a08b52b8ad73bdd1f36ae8348056e">&#9670;&#160;</a></span>removeWord()</h2>
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<td class="memname">void Trie::removeWord </td>
<td>(</td>
<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;&#160;</td>
<td class="paramname"><em>word</em></td><td>)</td>
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<div class="fragment"><div class="line"><span class="lineno"> 148</span> {</div>
<div class="line"><span class="lineno"> 149</span> m_root = <a class="code hl_function" href="../../dd/d2f/class_trie.html#a26941759ecf94d67a27d4a610bc0f63d">removeWordHelper</a>(word, m_root, 0);</div>
<div class="line"><span class="lineno"> 150</span> }</div>
<div class="ttc" id="aclass_trie_html_a26941759ecf94d67a27d4a610bc0f63d"><div class="ttname"><a href="../../dd/d2f/class_trie.html#a26941759ecf94d67a27d4a610bc0f63d">Trie::removeWordHelper</a></div><div class="ttdeci">std::shared_ptr&lt; TrieNode &gt; removeWordHelper(const std::string &amp;word, std::shared_ptr&lt; TrieNode &gt; curr, size_t index)</div><div class="ttdef"><b>Definition:</b> trie_modern.cpp:64</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a26941759ecf94d67a27d4a610bc0f63d">&#9670;&#160;</a></span>removeWordHelper()</h2>
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<td class="memname"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/memory/shared_ptr.html">std::shared_ptr</a>&lt; <a class="el" href="../../de/d48/struct_trie_1_1_trie_node.html">TrieNode</a> &gt; Trie::removeWordHelper </td>
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<p>A recursive helper function to remove a word from the trie. First, it recursively traverses to the location of last character of word in the trie. However, if the word is not found, the function returns a runtime error. Upon successfully reaching the last character of word in trie, if sets the isEndOfWord to false and deletes the node if and only if it has no children, else it returns the current node. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">word</td><td>is the string which needs to be removed from trie. </td></tr>
<tr><td class="paramname">curr</td><td>is the current node we are at. </td></tr>
<tr><td class="paramname">index</td><td>is the index of the @word we are at. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>if current node has childern, it returns @ curr, else it returns nullptr. </dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">a</td><td>runtime error in case @ word is not found in the trie. </td></tr>
</table>
</dd>
</dl>
<div class="fragment"><div class="line"><span class="lineno"> 66</span> {</div>
<div class="line"><span class="lineno"> 67</span> <span class="keywordflow">if</span> (word.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() == index) {</div>
<div class="line"><span class="lineno"> 68</span> <span class="keywordflow">if</span> (curr-&gt;isEndOfWord) {</div>
<div class="line"><span class="lineno"> 69</span> curr-&gt;isEndOfWord = <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 70</span> }</div>
<div class="line"><span class="lineno"> 71</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb">hasChildren</a>(curr)) {</div>
<div class="line"><span class="lineno"> 72</span> <span class="keywordflow">return</span> curr;</div>
<div class="line"><span class="lineno"> 73</span> }</div>
<div class="line"><span class="lineno"> 74</span> <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
<div class="line"><span class="lineno"> 75</span> }</div>
<div class="line"><span class="lineno"> 76</span> </div>
<div class="line"><span class="lineno"> 77</span> <span class="keywordtype">size_t</span> idx = word[index] - <span class="charliteral">&#39;a&#39;</span>;</div>
<div class="line"><span class="lineno"> 78</span> </div>
<div class="line"><span class="lineno"> 79</span> <span class="comment">// Throw a runtime error in case the user enters a word which is not</span></div>
<div class="line"><span class="lineno"> 80</span> <span class="comment">// present in the trie.</span></div>
<div class="line"><span class="lineno"> 81</span> <span class="keywordflow">if</span> (!curr-&gt;character[idx]) {</div>
<div class="line"><span class="lineno"> 82</span> <span class="keywordflow">throw</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/error/runtime_error.html">std::runtime_error</a>(<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/utility/move.html">std::move</a>(<a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a>(<span class="stringliteral">&quot;Word not found.&quot;</span>)));</div>
<div class="line"><span class="lineno"> 83</span> }</div>
<div class="line"><span class="lineno"> 84</span> </div>
<div class="line"><span class="lineno"> 85</span> curr-&gt;character[idx] =</div>
<div class="line"><span class="lineno"> 86</span> <a class="code hl_function" href="../../dd/d2f/class_trie.html#a26941759ecf94d67a27d4a610bc0f63d">removeWordHelper</a>(word, curr-&gt;character[idx], index + 1);</div>
<div class="line"><span class="lineno"> 87</span> </div>
<div class="line"><span class="lineno"> 88</span> <span class="comment">// This if condition checks if the node has some childern.</span></div>
<div class="line"><span class="lineno"> 89</span> <span class="comment">// The 1st if check, i.e. (curr-&gt;character[idx]) is checked specifically</span></div>
<div class="line"><span class="lineno"> 90</span> <span class="comment">// because if the older string is a prefix of some other string, then,</span></div>
<div class="line"><span class="lineno"> 91</span> <span class="comment">// there would be no need to check all 26 characters. Example- str1 =</span></div>
<div class="line"><span class="lineno"> 92</span> <span class="comment">// abbey, str2 = abbex and we want to delete string &quot;abbey&quot;, then in</span></div>
<div class="line"><span class="lineno"> 93</span> <span class="comment">// this case, there would be no need to check all characters for the</span></div>
<div class="line"><span class="lineno"> 94</span> <span class="comment">// chars a,b,b.</span></div>
<div class="line"><span class="lineno"> 95</span> <span class="keywordflow">if</span> (curr-&gt;character[idx] || <a class="code hl_function" href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb">hasChildren</a>(curr)) {</div>
<div class="line"><span class="lineno"> 96</span> <span class="keywordflow">return</span> curr;</div>
<div class="line"><span class="lineno"> 97</span> }</div>
<div class="line"><span class="lineno"> 98</span> <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
<div class="line"><span class="lineno"> 99</span> }</div>
<div class="ttc" id="abasic_string_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a></div></div>
<div class="ttc" id="aclass_trie_html_a6d10eb1669453395d1900ebd401954fb"><div class="ttname"><a href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb">Trie::hasChildren</a></div><div class="ttdeci">static bool hasChildren(std::shared_ptr&lt; TrieNode &gt; node)</div><div class="ttdef"><b>Definition:</b> trie_modern.cpp:41</div></div>
<div class="ttc" id="amove_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/utility/move.html">std::move</a></div><div class="ttdeci">T move(T... args)</div></div>
<div class="ttc" id="aruntime_error_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/error/runtime_error.html">std::runtime_error</a></div></div>
<div class="ttc" id="asize_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">std::string::size</a></div><div class="ttdeci">T size(T... args)</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a411e77126930a0942dd7b65e96b15206">&#9670;&#160;</a></span>search()</h2>
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<td class="memname">bool Trie::search </td>
<td>(</td>
<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> &amp;&#160;</td>
<td class="paramname"><em>word</em></td><td>)</td>
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<p>Search if a word is present in trie or not. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">word</td><td>which is needed to be searched in the trie. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>True if the word is found in trie and isEndOfWord is set to true. </dd>
<dd>
False if word is not found in trie or isEndOfWord is set to false. </dd></dl>
<div class="fragment"><div class="line"><span class="lineno"> 132</span> {</div>
<div class="line"><span class="lineno"> 133</span> <span class="keyword">auto</span> curr = m_root;</div>
<div class="line"><span class="lineno"> 134</span> <span class="keywordflow">for</span> (<span class="keywordtype">char</span> ch : word) {</div>
<div class="line"><span class="lineno"> 135</span> <span class="keywordtype">size_t</span> index = ch - <span class="charliteral">&#39;a&#39;</span>;</div>
<div class="line"><span class="lineno"> 136</span> </div>
<div class="line"><span class="lineno"> 137</span> <span class="comment">// if any node for a character is not found, then return that the</span></div>
<div class="line"><span class="lineno"> 138</span> <span class="comment">// word cannot be formed.</span></div>
<div class="line"><span class="lineno"> 139</span> <span class="keywordflow">if</span> (!curr-&gt;character[index]) {</div>
<div class="line"><span class="lineno"> 140</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><span class="lineno"> 141</span> }</div>
<div class="line"><span class="lineno"> 142</span> curr = curr-&gt;character[index];</div>
<div class="line"><span class="lineno"> 143</span> }</div>
<div class="line"><span class="lineno"> 144</span> <span class="keywordflow">return</span> curr-&gt;isEndOfWord;</div>
<div class="line"><span class="lineno"> 145</span> }</div>
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