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< h1 > Boost Exception</ h1 >
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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 >
</ ul ></ div >
< 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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