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<section id="geopm-exception-3-custom-geopm-exceptions">
<h1>geopm::Exception(3) – custom GEOPM exceptions<a class="headerlink" href="#geopm-exception-3-custom-geopm-exceptions" title="Link to this heading"></a></h1>
<section id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">Exception</span></code> class and the <code class="docutils literal notranslate"><span class="pre">exception_handler()</span></code> function are members of
the <code class="docutils literal notranslate"><span class="pre">namespace</span> <span class="pre">geopm</span></code>, but the full names, <code class="docutils literal notranslate"><span class="pre">geopm::Exception</span></code> and
<code class="docutils literal notranslate"><span class="pre">geopm::exception_handler()</span></code>, have 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::string</span></code>, <code class="docutils literal notranslate"><span class="pre">std::exception_ptr</span></code>, <code class="docutils literal notranslate"><span class="pre">std::runtime_error</span></code>, and <code class="docutils literal notranslate"><span class="pre">std::function</span></code>, to enable
better rendering of this manual.</p>
<p>Note that the <code class="docutils literal notranslate"><span class="pre">geopm::Exception</span></code> class is derived from <code class="docutils literal notranslate"><span class="pre">std::runtime_error</span></code> class.</p>
</section>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Link to this heading"></a></h2>
<p>#include <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/libgeopmd/include/geopm/Exception.hpp"><geopm/Exception.hpp></a></p>
<p>Link with <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(MPI)</strong> or <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(non-MPI)</strong></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="nf">exception_handler</span><span class="p">(</span><span class="n">exception_ptr</span><span class="w"> </span><span class="n">eptr</span><span class="p">,</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">do_print</span><span class="o">=</span><span class="nb">false</span><span class="p">);</span>
<span class="n">Exception</span><span class="o">::</span><span class="n">Exception</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
<span class="n">Exception</span><span class="o">::</span><span class="n">Exception</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">Exception</span><span class="w"> </span><span class="o">&</span><span class="n">other</span><span class="p">);</span>
<span class="n">Exception</span><span class="o">::</span><span class="n">Exception</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">what</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">err</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="n">file</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">line</span><span class="p">);</span>
<span class="k">virtual</span><span class="w"> </span><span class="n">Exception</span><span class="o">::~</span><span class="n">Exception</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">default</span><span class="p">;</span>
<span class="kt">int</span><span class="w"> </span><span class="nf">Exception::err_value</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>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
<p>This class is used to format error messages for the GEOPM runtime
according to the error code. The list of errors is described in
<a class="reference internal" href="geopm_error.3.html"><span class="doc">geopm_error(3)</span></a>. Positive error codes are system errors (see
<a class="reference external" href="https://man7.org/linux/man-pages/man3/errno.3.html">errno(3)</a>), negative values are GEOPM errors. If zero is specified
for the error code, <code class="docutils literal notranslate"><span class="pre">GEOPM_ERROR_RUNTIME</span></code> (-1) is assumed.</p>
</section>
<section id="functions">
<h2>Functions<a class="headerlink" href="#functions" title="Link to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">exception_handler()</span></code>:
Handle a thrown exception pointed to by <em>eptr</em> and return an error
value. This exception handler is used by every GEOPM <strong>C</strong> interface
to handle any exceptions that are thrown during execution of a <strong>C++</strong>
implementation. If GEOPM has been configured with debugging
enabled and <em>do_print</em> is true, then this handler will print an
explanatory message to standard error. In all cases it will
convert the <strong>C++</strong> exception into an error number which can be used
with <code class="docutils literal notranslate"><span class="pre">geopm_error_message()</span></code> to obtain an error message. Note that
the error message printed when debugging is enabled has more
specific information than the message produced by
<code class="docutils literal notranslate"><span class="pre">geopm_error_message()</span></code>.</p></li>
</ul>
</section>
<section id="class-methods">
<h2>Class Methods<a class="headerlink" href="#class-methods" title="Link to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">Exception()</span></code>:
Empty constructor. Uses <code class="docutils literal notranslate"><span class="pre">errno</span></code> to determine the error code.
If errno is zero then <code class="docutils literal notranslate"><span class="pre">GEOPM_ERROR_RUNTIME</span></code> (-1) is used for the error code.
Enables an abbreviated <code class="docutils literal notranslate"><span class="pre">what()</span></code> result.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Exception(const</span> <span class="pre">string</span> <span class="pre">&what,</span> <span class="pre">int</span> <span class="pre">err,</span> <span class="pre">const</span> <span class="pre">char</span> <span class="pre">*file,</span> <span class="pre">int</span> <span class="pre">line)</span></code>:
Message, error number, file and line constructor. User provides
message <em>what</em>, error code <em>err</em>, and location where the exception
was thrown. The <em>file</em> name and <em>line</em> number may come from
preprocessor macros <code class="docutils literal notranslate"><span class="pre">__FILE__</span></code> and <code class="docutils literal notranslate"><span class="pre">__LINE__</span></code> respectively. The
<code class="docutils literal notranslate"><span class="pre">what()</span></code> method appends the user specified message, file name and
line number to the abbreviated message. This is the most verbose
messaging available with the Exception class.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">err_value()</span></code>:
Returns the non-zero error code associated with the
exception. Negative error codes are GEOPM-specific
and documented in the <a class="reference internal" href="geopm_error.3.html"><span class="doc">geopm_error(3)</span></a> man page.
Positive error codes are system errors and are
documented in the system <a class="reference external" href="https://man7.org/linux/man-pages/man3/errno.3.html">errno(3)</a> man page. A brief
description of all error codes can be obtained with
the <code class="docutils literal notranslate"><span class="pre">geopm_error_message()</span></code> interface.</p></li>
</ul>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Link 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_error.3.html"><span class="doc">geopm_error(3)</span></a>,
<a class="reference external" href="https://man7.org/linux/man-pages/man3/errno.3.html">errno(3)</a></p>
</section>
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