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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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< div class = "RenoIncludeDIV" >< p >< span class = "RenoEscape" > # <!--<wiki>`#</wiki>--> </ span > include < < span class = "RenoLink" >< a href = "exception_enable_current_exception_hpp.html" > boost/exception/enable_current_exception.hpp</ a ></ span > > </ p >
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< pre > namespace
boost
{
< span class = "RenoIncludeSPAN" > template < class T>
---unspecified--- < span class = "RenoLink" >< a href = "enable_current_exception.html" > enable_current_exception</ a ></ span > ( T const & e );</ span >
}</ pre >
</ div >< h4 > Requirements:</ h4 >
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< p > T must be a class with an accessible no-throw copy constructor.</ p >
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< h4 > Returns:</ h4 >
< p > An object of < i > unspecified</ i > type which derives publicly from T. That is, the returned object can be intercepted by a catch(T & ).</ p >
< h4 > Description:</ h4 >
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< p > This function is designed to be used directly in a throw-expression to enable the < span class = "RenoLink" >< a href = "exception_ptr.html" > exception_ptr</ a ></ span > support in Boost Exception. For example:</ p >
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< pre > class
my_exception:
public std::exception
{
};
....
throw boost::< span class = "RenoLink" >< a href = "enable_current_exception.html" > enable_current_exception</ a ></ span > (my_exception());</ pre >
< p > Unless < span class = "RenoLink" >< a href = "enable_current_exception.html" > enable_current_exception</ a ></ span > is called at the time an exception object is used in a throw-expression, an attempt to copy it using < span class = "RenoLink" >< a href = "current_exception.html" > current_exception</ a ></ span > may return an < span class = "RenoLink" >< a href = "exception_ptr.html" > exception_ptr</ a ></ span > which refers to an instance of < span class = "RenoLink" >< a href = "unknown_exception.html" > unknown_exception</ a ></ span > . See < span class = "RenoLink" >< a href = "current_exception.html" > current_exception</ a ></ span > for details.</ p >
< h4 > Note:</ h4 >
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< p > Instead of using the throw keyword directly, it is preferable to call boost::< span class = "RenoLink" >< a href = "throw_exception.html" > throw_exception</ a ></ span > . This is guaranteed to throw an exception that derives from boost::< span class = "RenoLink" >< a href = "exception.html" > exception</ a ></ span > and supports the < span class = "RenoLink" >< a href = "exception_ptr.html" > exception_ptr</ a ></ span > functionality.</ p >
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< h3 > See Also:</ h3 >
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< div class = "RenoPageList" >< a href = "boost-exception.html" > Boost Exception< br />
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</ a >< a href = "exception_enable_current_exception_hpp.html" > boost/exception/enable_current_exception.hpp< br />
</ a >< a href = "configuration_macros.html" > Configuration Macros< br />
</ a >< a href = "copy_exception.html" > copy_exception< br />
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</ a >< a href = "current_exception.html" > current_exception< br />
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</ a >< a href = "frequently_asked_questions.html" > Frequently Asked Questions< br />
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</ a >< a href = "tutorial_exception_ptr.html" > Transporting of Exceptions Between Threads< br />
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</ a >< a href = "throw_exception.html" > throw_exception< br />
</ a ></ div >
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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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