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< title > diagnostic information< / title >
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< h1 > Boost Exception< / h1 >
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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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< div class = "RenoIncludeDIV" > < div class = "RenoAutoDIV" > < h2 > Diagnostic Information< / h2 >
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< p > Boost Exception provides a namespace-scope function < span class = "RenoLink" > < a href = "diagnostic_information.html" > diagnostic_information< / a > < / span > which takes a boost::< span class = "RenoLink" > < a href = "exception.html" > exception< / a > < / span > . The returned string contains:< / p >
< div > < ul > < li > the string representation of all data objects added to the boost::< span class = "RenoLink" > < a href = "exception.html" > exception< / a > < / span > through < span class = "RenoLink" > < a href = "exception_operator_shl.html" > operator< < < / a > < / span > ;< / li >
< li > the output from std::exception::what;< / li >
< li > additional platform-specific diagnostic information.< / li >
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< p > The returned string is not presentable as a friendly user message, but because it is generated automatically, it is useful for debugging or logging purposes. Here is an example:< / p >
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< pre > #include < < span class = "RenoLink" > < a href = "boost_exception_all_hpp.html" > boost/exception/all.hpp< / a > < / span > >
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#include < iostream>
void f(); //throws unknown types that derive from boost::< span class = "RenoLink" > < a href = "exception.html" > exception< / a > < / span > .
void
g()
{
try
{
f();
}
catch(
boost::< span class = "RenoLink" > < a href = "exception.html" > exception< / a > < / span > & e )
{
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std::cerr < < < span class = "RenoLink" > < a href = "diagnostic_information.html" > diagnostic_information< / a > < / span > (e);
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}
}< / pre >
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< div class = "RenoIncludeDIV" > < h4 > Example:< / h4 >
< p > this is a possible output from the < span class = "RenoLink" > < a href = "diagnostic_information.html" > diagnostic_information< / a > < / span > function, as used in < i > libs/exception/example/example_io.cpp:< / i > < / p >
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< pre > example_io.cpp(70): Throw in function class boost::shared_ptr< struct _iobuf> __cdecl my_fopen(const char *,const char *)
Dynamic exception type: class boost::exception_detail::clone_impl< struct fopen_error>
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std::exception::what: example_io error
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[struct boost::< span class = "RenoLink" > < a href = "errinfo_api_function.html" > errinfo_api_function< / a > < / span > _ *] = fopen
[struct boost::< span class = "RenoLink" > < a href = "errinfo_errno.html" > errinfo_errno< / a > < / span > _ *] = 2, "No such file or directory"
[struct boost::< span class = "RenoLink" > < a href = "errinfo_file_name.html" > errinfo_file_name< / a > < / span > _ *] = tmp1.txt
[struct boost::< span class = "RenoLink" > < a href = "errinfo_file_open_mode.html" > errinfo_file_open_mode< / a > < / span > _ *] = rb< / pre >
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See also: < span class = "RenoPageList" > < a href = "boost-exception.html" > Boost Exception< / a > < / span >
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<!-- Copyright (c) 2006 - 2009 Emil Dotchevski and Reverge Studios, Inc. -->
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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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