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<a name="circular_buffer.example"></a><a class="link" href="example.html" title="Circular_buffer example">Circular_buffer example</a>
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<p>
Here is a simple example to introduce the class <code class="computeroutput"><a class="link" href="../boost/circular_buffer.html" title="Class template circular_buffer">circular_buffer</a></code>.
</p>
<p>
For all examples, we need this include:
</p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">circular_buffer</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
</pre>
<p>
This example shows contruction, inserting elements, overwriting and popping.
</p>
<pre class="programlisting"><span class="comment">// Create a circular buffer with a capacity for 3 integers.</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">circular_buffer</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">cb</span><span class="special">(</span><span class="number">3</span><span class="special">);</span>
<span class="comment">// Insert threee elements into the buffer.</span>
<span class="identifier">cb</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">1</span><span class="special">);</span>
<span class="identifier">cb</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">cb</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">3</span><span class="special">);</span>
<span class="keyword">int</span> <span class="identifier">a</span> <span class="special">=</span> <span class="identifier">cb</span><span class="special">[</span><span class="number">0</span><span class="special">];</span> <span class="comment">// a == 1</span>
<span class="keyword">int</span> <span class="identifier">b</span> <span class="special">=</span> <span class="identifier">cb</span><span class="special">[</span><span class="number">1</span><span class="special">];</span> <span class="comment">// b == 2</span>
<span class="keyword">int</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">cb</span><span class="special">[</span><span class="number">2</span><span class="special">];</span> <span class="comment">// c == 3</span>
<span class="comment">// The buffer is full now, so pushing subsequent</span>
<span class="comment">// elements will overwrite the front-most elements.</span>
<span class="identifier">cb</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">4</span><span class="special">);</span> <span class="comment">// Overwrite 1 with 4.</span>
<span class="identifier">cb</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="number">5</span><span class="special">);</span> <span class="comment">// Overwrite 2 with 5.</span>
<span class="comment">// The buffer now contains 3, 4 and 5.</span>
<span class="identifier">a</span> <span class="special">=</span> <span class="identifier">cb</span><span class="special">[</span><span class="number">0</span><span class="special">];</span> <span class="comment">// a == 3</span>
<span class="identifier">b</span> <span class="special">=</span> <span class="identifier">cb</span><span class="special">[</span><span class="number">1</span><span class="special">];</span> <span class="comment">// b == 4</span>
<span class="identifier">c</span> <span class="special">=</span> <span class="identifier">cb</span><span class="special">[</span><span class="number">2</span><span class="special">];</span> <span class="comment">// c == 5</span>
<span class="comment">// Elements can be popped from either the front or the back.</span>
<span class="identifier">cb</span><span class="special">.</span><span class="identifier">pop_back</span><span class="special">();</span> <span class="comment">// 5 is removed.</span>
<span class="identifier">cb</span><span class="special">.</span><span class="identifier">pop_front</span><span class="special">();</span> <span class="comment">// 3 is removed.</span>
<span class="comment">// Leaving only one element with value = 4.</span>
<span class="keyword">int</span> <span class="identifier">d</span> <span class="special">=</span> <span class="identifier">cb</span><span class="special">[</span><span class="number">0</span><span class="special">];</span> <span class="comment">// d == 4</span>
</pre>
<p>
You can see the full example code at <a href="../../../libs/circular_buffer/example/circular_buffer_example.cpp" target="_top">circular_buffer_example.cpp</a>.
</p>
<p>
The full annotated description is in the C++ Reference section.
</p>
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