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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_test.components.section_pem"></a><a class="link" href="section_pem.html" title="Program Execution Monitor">Program Execution
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Monitor</a>
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</h3></div></div></div>
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<div class="toc"><dl class="toc">
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<dt><span class="section"><a href="section_pem/usage.html">Usage</a></span></dt>
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<dt><span class="section"><a href="section_pem/configuration.html">Configuration</a></span></dt>
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<dt><span class="section"><a href="section_pem/implementation.html">Implementation</a></span></dt>
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<dt><span class="section"><a href="section_pem/compilation.html">Compilation</a></span></dt>
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</dl></div>
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<p>
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The components of a C++ program may report user-detected errors in several
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ways, such as via a return value or throwing an exception. System-detected
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errors such as dereferencing an invalid pointer are reported in other ways,
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totally operating system and compiler dependent.
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</p>
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<p>
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Yet many C++ programs, both production and test, must run in an environment
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where uniform reporting of errors is necessary. For example, converting otherwise
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uncaught exceptions to non-zero program return codes allows many command
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line, script, or batch environments to continue processing in a controlled
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manner. Even some <span class="emphasis"><em>GUI</em></span> environments benefit from the
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unification of errors into program return codes.
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</p>
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<p>
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The Boost.Test Library's <span class="emphasis"><em>Program Execution Monitor</em></span> (<span class="emphasis"><em>PEM</em></span>
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for short) relieves users from messy error detection and reporting duties
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by providing a replacement function <code class="computeroutput"><span class="identifier">main</span><span class="special">()</span></code> which calls a user-supplied <code class="computeroutput"><span class="identifier">cpp_main</span><span class="special">()</span></code>
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function within a monitored environment. The supplied <code class="computeroutput"><span class="identifier">main</span><span class="special">()</span></code> then uniformly detects and reports the
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occurrence of several types of errors, reducing them to a uniform return
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code which is returned to the host environment.
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</p>
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<p>
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Uniform error reporting is particularly useful for programs running unattended
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under control of scripts or batch files. Some operating systems pop up message
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boxes if an uncaught exception occurs, and this requires manual intervention.
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By converting such exceptions into non-zero program return codes, the library
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makes the program a better citizen. More uniform reporting of errors isn't
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a benefit to some programs, particularly programs always run by hand of a
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knowledgeable person. So the <span class="emphasis"><em>PEM</em></span> wouldn't be worth using
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in that environment.
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</p>
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<p>
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Uniform error reporting can be also useful in test environments such as the
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Boost regression tests. Be aware though in such case it might be preferable
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to use the <span class="emphasis"><em>UTF</em></span>, because it allows one to use the <a class="link" href="../testing_tools.html" title="The UTF testing tools">testing tools</a> and generate more
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detailed error information.
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</p>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2014 Gennadiy
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Rozental<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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