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<section id="geopm-circularbuffer-3-generic-circular-buffer">
<h1>geopm::CircularBuffer(3) – generic circular buffer<a class="headerlink" href="#geopm-circularbuffer-3-generic-circular-buffer" title="Permalink to this heading"></a></h1>
<section id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Permalink to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">CircularBuffer</span></code> class is a member of the <code class="docutils literal notranslate"><span class="pre">namespace</span> <span class="pre">geopm</span></code>,
but the full name, <code class="docutils literal notranslate"><span class="pre">geopm::CircularBuffer</span></code>, has been abbreviated in this manual.
Similarly, the <code class="docutils literal notranslate"><span class="pre">std::</span></code> namespace specifier has been omitted from the
interface definitions for the following standard types: <code class="docutils literal notranslate"><span class="pre">std::vector</span></code>,
<code class="docutils literal notranslate"><span class="pre">std::pair</span></code>, <code class="docutils literal notranslate"><span class="pre">std::string</span></code>, <code class="docutils literal notranslate"><span class="pre">std::map</span></code>, and <code class="docutils literal notranslate"><span class="pre">std::function</span></code>, to enable
better rendering of this manual.</p>
</section>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this heading"></a></h2>
<p>#include <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/service/src/geopm/CircularBuffer.hpp"><geopm/CircularBuffer.hpp></a></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="kt">void</span><span class="w"> </span><span class="nf">CircularBuffer::set_capacity</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">size</span><span class="p">);</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CircularBuffer::clear</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">CircularBuffer::size</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">CircularBuffer::capacity</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span>
<span class="kt">void</span><span class="w"> </span><span class="nf">CircularBuffer::insert</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="w"> </span><span class="n">value</span><span class="p">);</span>
<span class="k">const</span><span class="w"> </span><span class="n">T</span><span class="o">&</span><span class="w"> </span><span class="nf">CircularBuffer::value</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">index</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span>
<span class="n">vector</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">CircularBuffer</span><span class="o">::</span><span class="n">make_vector</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span>
<span class="n">vector</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">CircularBuffer</span><span class="o">::</span><span class="n">make_vector</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">start</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">unsigned</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">end</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this heading"></a></h2>
<p>The CircularBuffer container implements a fixed-size buffer. Once at
capacity, any new insertions cause the oldest entry to be dropped.</p>
</section>
<section id="class-methods">
<h2>Class Methods<a class="headerlink" href="#class-methods" title="Permalink to this heading"></a></h2>
<dl>
<dt><code class="docutils literal notranslate"><span class="pre">set_capacity()</span></code></dt><dd><p>Grows or shrinks the capacity of the circular buffer.
If the new capacity is greater than the size, then the current
contents will not be modified.
If the new capacity is smaller than the size, then only the newest
elements of the difference will be retained.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">clear()</span></code></dt><dd><p>Clears all entries from the buffer. The size becomes <code class="docutils literal notranslate"><span class="pre">0</span></code>, but the
capacity is unchanged.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">size()</span></code></dt><dd><p>Returns the number of items in the buffer. This value will be less
than or equal to the current capacity of the buffer.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">capacity()</span></code></dt><dd><p>Returns the current size of the circular buffer at the time of the
call.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">insert()</span></code></dt><dd><p>Inserts <em>value</em> into the buffer. If the buffer is not full, the new
value is simply added to the buffer. It the buffer is at capacity,
The head of the buffer is <strong>dropped</strong> and moved to the next oldest entry
and the new value is then inserted at the end of the buffer.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">value()</span></code></dt><dd><p>Returns a constant reference to the value from the buffer.
Accesses the contents of the circular buffer
at a particular <em>index</em>.</p>
<ul class="simple">
<li><p>Valid positive indices range from <code class="docutils literal notranslate"><span class="pre">0</span></code> to <code class="docutils literal notranslate"><span class="pre">size-1</span></code>.</p></li>
<li><p>Valid negative indices range from <code class="docutils literal notranslate"><span class="pre">-1</span></code> to <code class="docutils literal notranslate"><span class="pre">-size</span></code>.
Negative indices work just like <strong>python</strong> indices,
to represent nth-most-recent insertions. For example,
<code class="docutils literal notranslate"><span class="pre">-1</span></code> is the last element, <code class="docutils literal notranslate"><span class="pre">-2</span></code> is the second to last element, and so on.</p></li>
</ul>
<p>Where <code class="docutils literal notranslate"><span class="pre">size</span></code> is the number of valid entries in the buffer.</p>
<ul class="simple">
<li><p>An out of bounds <em>index</em> is <code class="docutils literal notranslate"><span class="pre">></span> <span class="pre">[size-1]</span></code> <strong>OR</strong> <code class="docutils literal notranslate"><span class="pre"><</span> <span class="pre">[-size]</span></code>.
An attempt to retrieve a value for an out of
bound index will throw a <a class="reference internal" href="GEOPM_CXX_MAN_Exception.3.html"><span class="doc">geopm::Exception(3)</span></a> with an
<code class="docutils literal notranslate"><span class="pre">error_value()</span></code> of <code class="docutils literal notranslate"><span class="pre">GEOPM_ERROR_INVALID</span></code>.</p></li>
</ul>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">make_vector()</span></code></dt><dd><p>Create a vector from the entire circular buffer contents.
Or create a vector slice from the circular buffer contents,
delimited by the <em>Start</em> index <strong>(inclusive)</strong> and <em>End</em> index <strong>(exclusive)</strong>
such as <code class="docutils literal notranslate"><span class="pre">[start,</span> <span class="pre">end)</span></code>.
If the range presented by these two indexes is invalid
it will throw a <a class="reference internal" href="GEOPM_CXX_MAN_Exception.3.html"><span class="doc">geopm::Exception(3)</span></a></p>
</dd>
</dl>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Permalink to this heading"></a></h2>
<p><a class="reference internal" href="geopm.7.html"><span class="doc">geopm(7)</span></a>,
<a class="reference internal" href="GEOPM_CXX_MAN_Exception.3.html"><span class="doc">geopm::Exception(3)</span></a></p>
</section>
</section>
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