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boost exception

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[SVN r43485]
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Emil Dotchevski
2008-03-04 01:41:17 +00:00
committed by Peter Dimov
parent 4fd93c01b5
commit db3574bc9d
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<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN'
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<title>throw_exception</title>
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<div id="boost_logo">
<a href="http://www.boost.org"><img style="border:0" src="http://www.boost.org/boost.png" alt="Boost" width="277" height="86"/></a>
</div>
<h1>Boost Exception</h1>
</div>
<div class="RenoIncludeDIV"><h3>throw_exception()</h3>
<div class="RenoIncludeDIV"><p><tt>#include &lt;<span class="RenoLink"><a href="throw_exception_hpp.html">boost/throw_exception.hpp</a></span>&gt;</tt></p>
<pre>namespace
boost
{
<span class="RenoIncludeSPAN">#ifdef BOOST_NO_EXCEPTIONS
void <span class="RenoLink"><a href="throw_exception.html">throw_exception</a></span>( std::exception const &amp; e ); // user defined
#else
template &lt;class E&gt;
void <span class="RenoLink"><a href="throw_exception.html">throw_exception</a></span>( E const &amp; e );
#endif</span>
}</pre>
</div><h4>Effects:</h4>
<div><ul><li> If <tt>BOOST_NO_EXCEPTIONS</tt> is not defined, <tt>boost::<span class="RenoLink"><a href="throw_exception.html">throw_exception</a></span>(e)</tt> is equivalent to <tt>throw boost::<span class="RenoLink"><a href="enable_exception_cloning.html">enable_exception_cloning</a></span>(boost::<span class="RenoLink"><a href="enable_error_info.html">enable_error_info</a></span>(e))</tt>, unless <tt>BOOST_EXCEPTION_DISABLE</tt> is defined, in which case <tt>boost::<span class="RenoLink"><a href="throw_exception.html">throw_exception</a></span>(e)</tt> is equivalent to <tt>throw e;</tt></li>
<li> If <tt>BOOST_NO_EXCEPTIONS</tt> is defined, the function is left undefined, and the user is expected to supply an appropriate definition. Callers of <tt>throw_exception</tt> are allowed to assume that the function never returns; therefore, if the user-defined <tt>throw_exception</tt> returns, the behavior is undefined.</li>
</ul></div>
</div><h3>See also:</h3>
<div class="RenoPageList"><a href="boost-exception.html">Boost Exception<br/>
</a><a href="enable_exception_cloning.html">enable_exception_cloning<br/>
</a><a href="cloning.html">Tutorial: Transporting of Exceptions between Threads<br/>
</a></div>
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<small>Copyright (c) 2006-2008 by Emil Dotchevski and Reverge Studios, Inc.<br/>
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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//Copyright (c) 2006-2008 Emil Dotchevski and Reverge Studios, Inc.
//Distributed under the Boost Software License, Version 1.0. (See accompanying
//file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef UUID_274DA366004E11DCB1DDFE2E56D89593
#define UUID_274DA366004E11DCB1DDFE2E56D89593
#include <boost/exception/detail/counted_base.hpp>
#include <boost/intrusive_ptr.hpp>
#include <typeinfo>
namespace
boost
{
template <class T>
class shared_ptr;
namespace
exception_detail
{
class error_info_base;
struct
error_info_container:
public exception_detail::counted_base
{
virtual char const * what( std::type_info const & ) const = 0;
virtual shared_ptr<error_info_base const> get( std::type_info const & ) const = 0;
virtual void set( shared_ptr<error_info_base const> const & ) = 0;
};
}
template <class Tag,class T>
class error_info;
template <class E,class Tag,class T>
E const & operator<<( E const &, error_info<Tag,T> const & );
template <class ErrorInfo,class E>
shared_ptr<typename ErrorInfo::value_type const> get_error_info( E const & );
class
exception
{
public:
virtual ~exception() throw()=0;
virtual char const * what() const throw();
private:
shared_ptr<exception_detail::error_info_base const> get( std::type_info const & ) const;
void set( shared_ptr<exception_detail::error_info_base const> const & ) const;
template <class E,class Tag,class T>
friend E const & operator<<( E const &, error_info<Tag,T> const & );
template <class ErrorInfo,class E>
friend shared_ptr<typename ErrorInfo::value_type const> get_error_info( E const & );
intrusive_ptr<exception_detail::error_info_container> mutable data_;
};
inline
exception::
~exception() throw()
{
}
inline
char const *
exception::
what() const throw()
{
if( data_ )
try
{
char const * w = data_->what(typeid(*this));
BOOST_ASSERT(0!=w);
return w;
}
catch(...)
{
}
return typeid(*this).name();
}
}
#endif