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<title>Boost system/system_error.hpp documentation
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<h1>Header <a href="../../../boost/system/system_error.hpp">boost/system/system_error.hpp</a></h1>
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<p><a href="#Introduction">Introduction</a><br>
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<a href="#Synopsis">Synopsis</a><br>
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<a href="#Class-system_error">Class <code>system_error</code></a><br>
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<a href="#Class-system_error-members">Members</a><br>
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<a href="#Acknowledgements">Acknowledgements</a></p>
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<h2><a name="Introduction">Introduction</a></h2>
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<p>This header provides components used to report errors originating from the
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operating system or other low-level application program interfaces (API's). It is based on the <i>Diagnostics</i>
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portion of the TR2 filesystem proposal.</p>
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<h2><a name="Synopsis">Synopsis</a></h2>
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<pre>namespace boost
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{
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namespace system
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{
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enum message_action { append_message, no_message };
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class system_error : public std::runtime_error
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{
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public:
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explicit <a href="#system_error-1">system_error</a>( error_code ec );
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<a href="#system_error-2">system_error</a>( error_code ec, const std::string & what_arg,
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message_action ma = append_message );
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<a href="#system_error-3">system_error</a>( error_code::value_type ev, error_category ecat );
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<a href="#system_error-4">system_error</a>( error_code::value_type ev, error_category ecat,
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const std::string & what_arg, message_action ma = append_message );
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virtual ~system_error() throw() {}
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const error_code & <a href="#code">code</a>() const throw();
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const char * <a href="#what">what</a>() const throw();
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private:
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error_code m_error_code; // for exposition only
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bool m_append_message; // for exposition only
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mutable std::string m_what; // for exposition only
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};
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} // namespace system
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} // namespace boost</pre>
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<h2><a name="Class-system_error">Class <code>system_error</code></a></h2>
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<p>Class <code><a href="#Class-system_error-members">system_error</a></code> defines
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the type of an object that may be thrown as
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an exception to report errors originating from the operating system or other
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low-level API's, or used as a base class for more refined exception classes. It
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encapsulates an <code><a href="error_code.html">error_code</a></code> object.</p>
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<blockquote>
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<p><i>[Note:</i> A single low-level class, rather than a higher level exception
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class hierarchy, is provided to allow users access to low-level error codes
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originating from the operating system or other low-level API's, and to
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accommodate the open-ended set of errors that may be reported by such API's. <i>
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--end note.]</i></p>
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</blockquote>
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<h2><a name="Class-system_error-members">Class <code>system_error</code> Members</a></h2>
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<p><code>explicit <a name="system_error-1">system_error</a>( error_code ec );</code></p>
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<blockquote>
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<p><i>Effects:</i> Constructs an object of class <code>system_error</code>.</p>
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<p><i>Postcondition:</i> <code>code() == ec && *runtime_error::what() == '\0'
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&& </code><code>m_append_message</code>.</p>
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</blockquote>
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<pre><a name="system_error-2">system_error</a>( error_code ec, const std::string & what_arg, message_action ma = append_message );</pre>
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<blockquote>
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<p><i>Effects:</i> Constructs an object of class <code>system_error</code>.</p>
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<p><i>Postcondition:</i> <code>code() == ec && std::string(runtime_error::what())
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== </code><code>what_arg</code><code> && m_append_message == ma</code>.</p>
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</blockquote>
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<pre><a name="system_error-3">system_error</a>( error_code::value_type ev, error_category ecat );</pre>
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<blockquote>
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<p><i>Effects:</i> Constructs an object of class <code>system_error</code>.</p>
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<p><i>Postcondition:</i> <code>code() == error_code(ev,ecat) && *runtime_error::what()
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== '\0' && m_append_message</code>.</p>
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</blockquote>
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<pre><a name="system_error-4">system_error</a>( error_code::value_type ev, error_category ecat,
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const std::string & what_arg, message_action ma = append_message );</pre>
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<blockquote>
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<p><i>Effects:</i> Constructs an object of class <code>system_error</code>.</p>
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<p><i>Postcondition:</i> <code>code() == error_code(ev,ecat) && std::string(runtime_error::what())
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== </code><code>what_arg</code><code> && m_append_message == ma</code>.</p>
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</blockquote>
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<pre>const error_code & <a name="code">code</a>() const throw();</pre>
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<blockquote>
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<p><i>Returns: </i> <code>m_error_code</code></p>
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</blockquote>
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<pre>const char * <a name="what">what</a>() const throw();</pre>
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<blockquote>
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<p><i>Returns: </i>If <code>!m_error_code || !m_append_message</code>, <code>
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runtime_error::what()</code>. Otherwise, a string as if computed by:</p>
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<blockquote>
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<pre>m_what = runtime_error::what();
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if ( !m_what.empty() ) m_what += ": ";
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m_what += m_error_code.message();
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return m_what.c_str();</pre>
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</blockquote>
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</blockquote>
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<h2><a name="Acknowledgements">Acknowledgements</a></h2>
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<p>Christopher Kohlhoff and Peter Dimov made important contributions to the
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design. Comments and suggestions were also received from Pavel Vozenilek,
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Gennaro Prota, Dave Abrahams, Jeff Garland, Iain Hanson, Jeremy Day, Bo
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Persson, Oliver Kowalke, and
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Oleg Abrosimov.</p>
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<hr>
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<p>Last revised:
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<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->22 July, 2006<!--webbot bot="Timestamp" endspan i-checksum="21146" --></p>
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<p><EFBFBD> Copyright Beman Dawes, 2006</p>
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<p>Distributed under the Boost Software License, Version 1.0. (See accompanying
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file <a href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy at
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<a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/ LICENSE_1_0.txt</a>)</p>
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