91 lines
7.5 KiB
HTML
91 lines
7.5 KiB
HTML
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN'
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'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'>
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<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>
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<head>
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<meta http-equiv='Content-Type' content='text/html; charset=utf-8'/>
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<title>error_info</title>
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<link href='reno.css' type='text/css' rel='stylesheet'/>
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</head>
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<body>
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<div class="body-0">
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<div class="body-1">
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<div class="body-2">
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<div>
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<div id="boost_logo">
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<a href="http://www.boost.org"><img style="border:0" src="../../../boost.png" alt="Boost" width="277" height="86"/></a>
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</div>
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<h1>Boost Exception</h1>
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</div>
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<!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. -->
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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 http://www.boost.org/LICENSE_1_0.txt) -->
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<div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h3>error_info</h3>
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</div>
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<div class="RenoIncludeDIV"><p><span class="RenoEscape">#<!--<wiki>`#</wiki>--></span>include <<span class="RenoLink"><a href="boost_exception_info_hpp.html">boost/exception/info.hpp</a></span>></p>
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<pre>namespace
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boost
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{
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<span class="RenoIncludeSPAN"> template <class Tag,class T>
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class
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<span class="RenoLink">error_info</span>
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{
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public:
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<span class="RenoIncludeSPAN"> typedef T <span class="RenoLink"><a href="error_info_value_type.html">value_type</a></span>;</span>
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<span class="RenoIncludeSPAN"> <span class="RenoLink"><a href="error_info_error_info.html">error_info</a></span>( <span class="RenoLink"><a href="error_info_value_type.html">value_type</a></span> const & v );</span>
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<span class="RenoIncludeSPAN"> <span class="RenoLink"><a href="error_info_value_type.html">value_type</a></span> const & <span class="RenoLink"><a href="error_info_value.html">value</a></span>() const;
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<span class="RenoLink"><a href="error_info_value_type.html">value_type</a></span> & <span class="RenoLink"><a href="error_info_value.html">value</a></span>();</span>
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};</span>
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}</pre>
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</div><h4>Requirements:</h4>
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<p>T must have accessible copy constructor and must not be a reference (there is no requirement that T's copy constructor does not throw.)</p>
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<h4>Description:</h4>
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<p>This class template is used to associate a Tag type with a value type T. Objects of type <span class="RenoLink">error_info</span><Tag,T> can be passed to <span class="RenoLink"><a href="exception_operator_shl.html">operator<<</a></span> to be stored in objects of type boost::<span class="RenoLink"><a href="exception.html">exception</a></span>.</p>
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<h4>Usage:</h4>
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<p>The header <<span class="RenoLink"><a href="boost_exception_error_info_hpp.html">boost/exception/error_info.hpp</a></span>> provides a declaration of the <span class="RenoLink">error_info</span> template, which is sufficient for the purpose of typedefing an instance for specific Tag and T, for example:</p>
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<pre>#include <<span class="RenoLink"><a href="boost_exception_error_info_hpp.html">boost/exception/error_info.hpp</a></span>>
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struct tag_errno;
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typedef boost::<span class="RenoLink">error_info</span><tag_errno,int> errno_info;</pre>
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<p>Or, the shorter equivalent:</p>
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<pre>#include <<span class="RenoLink"><a href="boost_exception_error_info_hpp.html">boost/exception/error_info.hpp</a></span>>
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typedef boost::<span class="RenoLink">error_info</span><struct tag_errno,int> errno_info;</pre>
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<p>This errno_info typedef can be passed to <span class="RenoLink"><a href="exception_operator_shl.html">operator<<</a></span> (#include <<span class="RenoLink"><a href="boost_exception_info_hpp.html">boost/exception/info.hpp</a></span>> first) to store an int named tag_errno in exceptions of types that derive from boost::<span class="RenoLink"><a href="exception.html">exception</a></span>:</p>
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<pre>throw file_read_error() <span class="RenoLink"><a href="exception_operator_shl.html"><<</a></span> errno_info(errno);</pre>
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<p>It can also be passed to <span class="RenoLink"><a href="get_error_info.html">get_error_info</a></span> (#include <<span class="RenoLink"><a href="boost_exception_get_error_info_hpp.html">boost/exception/get_error_info.hpp</a></span>> first) to retrieve the tag_errno int from a boost::<span class="RenoLink"><a href="exception.html">exception</a></span>:</p>
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<pre>catch( boost::<span class="RenoLink"><a href="exception.html">exception</a></span> & x )
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{
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if( int const * e=boost::<span class="RenoLink"><a href="get_error_info.html">get_error_info</a></span><errno_info>(x) )
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....
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}</pre>
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<p>For convenience and uniformity, Boost Exception defines the following commonly used <span class="RenoLink">error_info</span> typedefs, ready for use with <span class="RenoLink"><a href="exception_operator_shl.html">operator<<</a></span>:</p>
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<div class="RenoPageList"><a href="errinfo_api_function.html">errinfo_api_function</a><br/>
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<a href="errinfo_at_line.html">errinfo_at_line</a><br/>
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<a href="errinfo_errno.html">errinfo_errno</a><br/>
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<a href="errinfo_file_handle.html">errinfo_file_handle</a><br/>
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<a href="errinfo_file_name.html">errinfo_file_name</a><br/>
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<a href="errinfo_file_open_mode.html">errinfo_file_open_mode</a><br/>
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<a href="errinfo_nested_exception.html">errinfo_nested_exception</a><br/>
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<a href="errinfo_type_info_name.html">errinfo_type_info_name</a></div>
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</div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
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See also: <span class="RenoPageList"><a href="boost-exception.html">Boost Exception</a> | <a href="boost_exception_error_info_hpp.html">boost/exception/error_info.hpp</a> | <a href="boost_exception_exception_hpp.html">boost/exception/exception.hpp</a> | <a href="boost_exception_info_hpp.html">boost/exception/info.hpp</a> | <a href="diagnostic_information.html">diagnostic_information</a> | <a href="diagnostic_information_what.html">diagnostic_information_what</a> | <a href="error_info_error_info.html">error_info::error_info</a> | <a href="error_info_value.html">error_info::value</a> | <a href="error_info_value_type.html">error_info::value_type</a> | <a href="exception.html">exception</a> | <a href="exception_operator_shl.html">exception/operator<<</a> | <a href="exception_ptr.html">exception_ptr</a> | <a href="frequently_asked_questions.html">Frequently Asked Questions</a> | <a href="get_error_info.html">get_error_info</a> | <a href="tutorial_enable_error_info.html">Integrating Boost Exception in Existing Exception Class Hierarchies</a> | <a href="motivation.html">Motivation</a> | <a href="original_exception_type.html">original_exception_type</a> | <a href="tuple_operator_shl.html">tuple/operator<<</a></span>
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</div>
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<!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. -->
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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 http://www.boost.org/LICENSE_1_0.txt) -->
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<small>Copyright (c) 2006-2009 by Emil Dotchevski and Reverge Studios, Inc.<br/>
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Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</small>
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