boost/exception/enable_current_exception.hpp
//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_78CC85B2914F11DC8F47B48E55D89593
#define UUID_78CC85B2914F11DC8F47B48E55D89593
#include <boost/exception/exception.hpp>
#include <boost/exception/detail/cloning_base.hpp>
#include <boost/detail/atomic_count.hpp>
#include <boost/assert.hpp>
#include <new>
namespace
boost
{
namespace
exception_detail
{
class
clone_base:
public counted_base
{
public:
virtual void rethrow() const=0;
};
struct
bad_alloc_impl:
public clone_base,
public std::bad_alloc
{
void
add_ref() const
{
}
void
release() const
{
}
void
rethrow() const
{
throw *this;
}
};
template <class T>
clone_base * make_clone( T const & );
template <class T>
class
clone_impl:
public T,
public cloning_base
{
public:
explicit
clone_impl( T const & x ):
T(x)
{
if( boost::exception * be1=dynamic_cast<boost::exception *>(this) )
if( boost::exception const * be2=dynamic_cast<boost::exception const *>(&x) )
*be1 = *be2;
}
private:
clone_base const *
clone() const
{
return make_clone<T>(*this);
}
};
template <class T>
class
exception_clone:
public T,
public clone_base
{
public:
explicit
exception_clone( T const & x ):
T(x),
count_(0)
{
if( boost::exception * be1=dynamic_cast<boost::exception *>(this) )
if( boost::exception const * be2=dynamic_cast<boost::exception const *>(&x) )
*be1 = *be2;
}
private:
detail::atomic_count mutable count_;
void
add_ref() const
{
++count_;
}
void
release() const
{
if( !--count_ )
delete this;
}
void
rethrow() const
{
throw clone_impl<T>(*this);
}
};
template <class T>
inline
clone_base *
make_clone( T const & x )
{
try
{
return new exception_clone<T>(x);
}
catch(
std::bad_alloc & )
{
static bad_alloc_impl bad_alloc;
return &bad_alloc;
}
catch(
... )
{
BOOST_ASSERT(0);
return 0;
}
}
}
template <class T>
inline
exception_detail::clone_impl<T>
enable_current_exception( T const & x )
{
return exception_detail::clone_impl<T>(x);
}
}
#endif