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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<h1>6.4. Basic stack operations</h1>
<div id="toc">
<ul>
<li><a href="#0">Pushing an element on the stack</a></li>
<li><a href="#1">Poping an element from the stack</a></li>
<li><a href="#2">Peeking the last element of the stack</a></li>
</ul>
</div>
<a name="0"></a>
<h3>Pushing an element on the stack</h3>
<p>You can push an element on the stack (append it to the end of the list) :<br /> </p>
<div class="code">
<p class="cpp"><span class="code-keyword">template</span><span class="code-symbol">
<< /span><span class="code-keyword">class</span><span class="code-tcod"> T</span><span
class="code-symbol">></span><span class="code-keyword"> void</span> TCODList<span
class="code-symbol">::</span>push<span class="code-symbol">(</span><span
class="code-keyword">const</span><span class="code-tcod"> T</span> elt<span class="code-symbol">)</span>
</p>
<p class="c"><span class="code-keyword">void</span> TCOD_list_push<span class="code-symbol">(</span><span
class="code-tcod">TCOD_list_t</span> l<span class="code-symbol">,</span><span class="code-keyword">
const</span><span class="code-keyword"> void</span><span class="code-symbol"> *</span> elt<span
class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>elt</td>
<td>Element to append to the list.<br /> </td>
</tr>
<tr>
<td>l</td>
<td>In the C version, the list handler, returned by a constructor.<br /> </td>
</tr>
</tbody>
</table>
<h6>Example:</h6>
<div class="code">
<p class="cpp">TCODList<span class="code-symbol">
<< /span><span class="code-keyword">int</span><span class="code-symbol">></span> intList<span
class="code-symbol">;</span><span class="code-comment"> // the list is empty (contains 0
elements)<br /></span>intList<span class="code-symbol">.</span>push<span
class="code-symbol">(</span><span class="code-value">5</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><span class="code-comment"> // the list contains 1 element at position 0,
value = 5<br /></span>intList<span class="code-symbol">.</span>push<span
class="code-symbol">(</span><span class="code-value">2</span><span class="code-symbol">)</span><span
class="code-symbol">;</span></p>
<p class="c"><span class="code-tcod">TCOD_list_t</span> intList<span class="code-symbol"> =</span>
TCOD_list_new<span class="code-symbol">(</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><br />TCOD_list_push<span class="code-symbol">(</span>intList<span
class="code-symbol">,</span><span class="code-symbol">(</span><span class="code-keyword">const</span><span
class="code-keyword"> void</span><span class="code-symbol"> *</span><span class="code-symbol">)</span><span
class="code-value">5</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><br />TCOD_list_push<span class="code-symbol">(</span>intList<span
class="code-symbol">,</span><span class="code-symbol">(</span><span class="code-keyword">const</span><span
class="code-keyword"> void</span><span class="code-symbol"> *</span><span class="code-symbol">)</span><span
class="code-value">2</span><span class="code-symbol">)</span><span class="code-symbol">;</span></p>
</div>
<hr>
<a name="1"></a>
<h3>Poping an element from the stack</h3>
<p>You can pop an element from the stack (remove the last element of the list).<br /> </p>
<div class="code">
<p class="cpp"><span class="code-keyword">template</span><span class="code-symbol">
<< /span><span class="code-keyword">class</span><span class="code-tcod"> T</span><span
class="code-symbol">></span><span class="code-tcod"> T</span> TCODList<span
class="code-symbol">::</span>pop<span class="code-symbol">(</span><span class="code-symbol">)</span></p>
<p class="c"><span class="code-keyword">void</span><span class="code-symbol"> *</span> TCOD_list_pop<span
class="code-symbol">(</span><span class="code-tcod">TCOD_list_t</span> l<span class="code-symbol">)</span>
</p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>l</td>
<td>In the C version, the list handler, returned by a constructor.<br /> </td>
</tr>
</tbody>
</table>
<h6>Example:</h6>
<div class="code">
<p class="cpp">TCODList<span class="code-symbol">
<< /span><span class="code-keyword">int</span><span class="code-symbol">></span> intList<span
class="code-symbol">;</span><span class="code-comment"> // the list is empty (contains 0
elements)<br /></span>intList<span class="code-symbol">.</span>push<span
class="code-symbol">(</span><span class="code-value">5</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><span class="code-comment"> // the list contains 1 element at position 0,
value = 5<br /></span>intList<span class="code-symbol">.</span>push<span
class="code-symbol">(</span><span class="code-value">2</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><span class="code-comment"> // the list contains 2 elements :
5,2<br /></span><span class="code-keyword">int</span> val<span class="code-symbol"> =</span>
intList<span class="code-symbol">.</span>pop<span class="code-symbol">(</span><span
class="code-symbol">)</span><span class="code-symbol">;</span><span class="code-comment"> // val == 2,
the list contains 1 element : 5<br /></span>val<span class="code-symbol"> =</span> intList<span
class="code-symbol">.</span>pop<span class="code-symbol">(</span><span class="code-symbol">)</span><span
class="code-symbol">;</span></p>
<p class="c"><span class="code-tcod">TCOD_list_t</span> intList<span class="code-symbol"> =</span>
TCOD_list_new<span class="code-symbol">(</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><br />TCOD_list_push<span class="code-symbol">(</span>intList<span
class="code-symbol">,</span><span class="code-symbol">(</span><span class="code-keyword">const</span><span
class="code-keyword"> void</span><span class="code-symbol"> *</span><span class="code-symbol">)</span><span
class="code-value">5</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><br />TCOD_list_push<span class="code-symbol">(</span>intList<span
class="code-symbol">,</span><span class="code-symbol">(</span><span class="code-keyword">const</span><span
class="code-keyword"> void</span><span class="code-symbol"> *</span><span class="code-symbol">)</span><span
class="code-value">2</span><span class="code-symbol">)</span><span class="code-symbol">;</span><span
class="code-keyword"><br />int</span> val<span class="code-symbol"> =</span><span class="code-symbol">
(</span><span class="code-keyword">int</span><span class="code-symbol">)</span>TCOD_list_pop<span
class="code-symbol">(</span>intList<span class="code-symbol">)</span><span
class="code-symbol">;</span><br />val<span class="code-symbol"> =</span><span class="code-symbol">
(</span><span class="code-keyword">int</span><span class="code-symbol">)</span>TCOD_list_pop<span
class="code-symbol">(</span>intList<span class="code-symbol">)</span><span class="code-symbol">;</span></p>
</div>
<hr>
<a name="2"></a>
<h3>Peeking the last element of the stack</h3>
<p>You can read the last element of the stack without removing it :<br /> </p>
<div class="code">
<p class="cpp"><span class="code-keyword">template</span><span class="code-symbol">
<< /span><span class="code-keyword">class</span><span class="code-tcod"> T</span><span
class="code-symbol">></span><span class="code-tcod"> T</span> TCODList<span
class="code-symbol">::</span>peek<span class="code-symbol">(</span><span
class="code-symbol">)</span><span class="code-keyword"> const</span></p>
<p class="c"><span class="code-keyword">void</span><span class="code-symbol"> *</span> TCOD_list_peek<span
class="code-symbol">(</span><span class="code-tcod">TCOD_list_t</span> l<span class="code-symbol">)</span>
</p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>l</td>
<td>In the C version, the list handler, returned by a constructor.<br /> </td>
</tr>
</tbody>
</table>
<h6>Example:</h6>
<div class="code">
<p class="cpp">TCODList<span class="code-symbol">
<< /span><span class="code-keyword">int</span><span class="code-symbol">></span> intList<span
class="code-symbol">;</span><br />intList<span class="code-symbol">.</span>push<span
class="code-symbol">(</span><span class="code-value">3</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><span class="code-comment"> // intList contains 1 elements :
3<br /></span><span class="code-keyword">int</span> val<span class="code-symbol"> =</span> intList<span
class="code-symbol">.</span>peek<span class="code-symbol">(</span><span
class="code-symbol">)</span><span class="code-symbol">;</span><span class="code-comment"> // val == 3,
inList contains 1 elements : 3<br /></span>intList<span class="code-symbol">.</span>push<span
class="code-symbol">(</span><span class="code-value">2</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><span class="code-comment"> // intList contains 2 elements : 3,
2<br /></span>val<span class="code-symbol"> =</span> intList<span class="code-symbol">.</span>peek<span
class="code-symbol">(</span><span class="code-symbol">)</span><span class="code-symbol">;</span></p>
<p class="c"><span class="code-tcod">TCOD_list_t</span> intList<span class="code-symbol"> =</span>
TCOD_list_new<span class="code-symbol">(</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><br />TCOD_list_push<span class="code-symbol">(</span>intList<span
class="code-symbol">,</span><span class="code-symbol">(</span><span class="code-keyword">const</span><span
class="code-keyword"> void</span><span class="code-symbol"> *</span><span class="code-symbol">)</span><span
class="code-value">3</span><span class="code-symbol">)</span><span class="code-symbol">;</span><span
class="code-keyword"><br />int</span> val<span class="code-symbol"> =</span><span class="code-symbol">
(</span><span class="code-keyword">int</span><span class="code-symbol">)</span>TCOD_list_peek<span
class="code-symbol">(</span>intList<span class="code-symbol">)</span><span
class="code-symbol">;</span><br />TCOD_list_push<span class="code-symbol">(</span>intList<span
class="code-symbol">,</span><span class="code-symbol">(</span><span class="code-keyword">const</span><span
class="code-keyword"> void</span><span class="code-symbol"> *</span><span class="code-symbol">)</span><span
class="code-value">2</span><span class="code-symbol">)</span><span
class="code-symbol">;</span><br />val<span class="code-symbol"> =</span><span class="code-symbol">
(</span><span class="code-keyword">int</span><span class="code-symbol">)</span>TCOD_list_peek<span
class="code-symbol">(</span>intList<span class="code-symbol">)</span><span class="code-symbol">;</span></p>
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