//Copyright (c) 2006-2009 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
namespace
boost
{
namespace
exception_detail
{
template <class T>
class
refcount_ptr
{
public:
refcount_ptr():
px_(0)
{
}
~refcount_ptr()
{
release();
}
refcount_ptr( refcount_ptr const & x ):
px_(x.px_)
{
add_ref();
}
refcount_ptr &
operator=( refcount_ptr const & x )
{
adopt(x.px_);
return *this;
}
void
adopt( T * px )
{
release();
px_=px;
add_ref();
}
T *
get() const
{
return px_;
}
private:
T * px_;
void
add_ref()
{
if( px_ )
px_->add_ref();
}
void
release()
{
if( px_ )
px_->release();
}
};
}
////////////////////////////////////////////////////////////////////////
template <class Tag,class T>
class error_info;
typedef error_info<struct tag_throw_function,char const *> throw_function;
typedef error_info<struct tag_throw_file,char const *> throw_file;
typedef error_info<struct tag_throw_line,int> throw_line;
template <>
class
error_info<tag_throw_function,char const *>
{
public:
typedef char const * value_type;
value_type v_;
explicit
error_info( value_type v ):
v_(v)
{
}
};
template <>
class
error_info<tag_throw_file,char const *>
{
public:
typedef char const * value_type;
value_type v_;
explicit
error_info( value_type v ):
v_(v)
{
}
};
template <>
class
error_info<tag_throw_line,int>
{
public:
typedef int value_type;
value_type v_;
explicit
error_info( value_type v ):
v_(v)
{
}
};
template <class E,class Tag,class T>
E const & operator<<( E const &, error_info<Tag,T> const & );
class exception;
template <class>
class shared_ptr;
namespace
exception_detail
{
class error_info_base;
struct type_info_;
struct
error_info_container
{
virtual char const * diagnostic_information() const = 0;
virtual shared_ptr<error_info_base const> get( type_info_ const & ) const = 0;
virtual void set( shared_ptr<error_info_base const> const &, type_info_ const & ) = 0;
virtual void add_ref() const = 0;
virtual void release() const = 0;
protected:
virtual
~error_info_container() throw()
{
}
};
template <class>
struct get_info;
template <>
struct get_info<throw_function>;
template <>
struct get_info<throw_file>;
template <>
struct get_info<throw_line>;
char const * get_diagnostic_information( exception const & );
}
class
exception
{
protected:
exception():
throw_function_(0),
throw_file_(0),
throw_line_(-1)
{
}
#ifdef __HP_aCC
//On HP aCC, this protected copy constructor prevents throwing boost::exception.
//On all other platforms, the same effect is achieved by the pure virtual destructor.
exception( exception const & x ) throw():
data_(x.data_),
throw_function_(x.throw_function_),
throw_file_(x.throw_file_),
throw_line_(x.throw_line_)
{
}
#endif
virtual ~exception() throw()
#ifndef __HP_aCC
= 0 //Workaround for HP aCC, =0 incorrectly leads to link errors.
#endif
;
private:
template <class E>
friend
E const &
operator<<( E const & x, throw_function const & y )
{
x.throw_function_=y.v_;
return x;
}
template <class E>
friend
E const &
operator<<( E const & x, throw_file const & y )
{
x.throw_file_=y.v_;
return x;
}
template <class E>
friend
E const &
operator<<( E const & x, throw_line const & y )
{
x.throw_line_=y.v_;
return x;
}
friend char const * exception_detail::get_diagnostic_information( exception const & );
template <class E,class Tag,class T>
friend E const & operator<<( E const &, error_info<Tag,T> const & );
template <class>
friend struct exception_detail::get_info;
friend struct exception_detail::get_info<throw_function>;
friend struct exception_detail::get_info<throw_file>;
friend struct exception_detail::get_info<throw_line>;
mutable exception_detail::refcount_ptr<exception_detail::error_info_container> data_;
mutable char const * throw_function_;
mutable char const * throw_file_;
mutable int throw_line_;
};
inline
exception::
~exception() throw()
{
}
////////////////////////////////////////////////////////////////////////
namespace
exception_detail
{
template <class T>
struct
error_info_injector:
public T,
public exception
{
explicit
error_info_injector( T const & x ):
T(x)
{
}
~error_info_injector() throw()
{
}
};
struct large_size { char c[256]; };
large_size dispatch( exception * );
struct small_size { };
small_size dispatch( void * );
template <class,int>
struct enable_error_info_helper;
template <class T>
struct
enable_error_info_helper<T,sizeof(large_size)>
{
typedef T type;
};
template <class T>
struct
enable_error_info_helper<T,sizeof(small_size)>
{
typedef error_info_injector<T> type;
};
template <class T>
struct
enable_error_info_return_type
{
typedef typename enable_error_info_helper<T,sizeof(dispatch((T*)0))>::type type;
};
}
template <class T>
inline
typename
exception_detail::enable_error_info_return_type<T>::type
enable_error_info( T const & x )
{
typedef typename exception_detail::enable_error_info_return_type<T>::type rt;
return rt(x);
}
////////////////////////////////////////////////////////////////////////
namespace
exception_detail
{
class
clone_base
{
public:
virtual clone_base const * clone() const = 0;
virtual void rethrow() const = 0;
virtual
~clone_base() throw()
{
}
};
inline
void
copy_boost_exception( exception * a, exception const * b )
{
*a = *b;
}
inline
void
copy_boost_exception( void *, void const * )
{
}
template <class T>
class
clone_impl:
public T,
public clone_base
{
public:
explicit
clone_impl( T const & x ):
T(x)
{
copy_boost_exception(this,&x);
}
~clone_impl() throw()
{
}
private:
clone_base const *
clone() const
{
return new clone_impl(*this);
}
void
rethrow() const
{
throw*this;
}
};
}
template <class T>
inline
exception_detail::clone_impl<T>
enable_current_exception( T const & x )
{
return exception_detail::clone_impl<T>(x);
}
}
#endif