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/
usr/
include/
c++/
4.6/
bits/
- drwxr-xr-x
|
Viewing file:  nested_exception.h (4.62 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
// Nested Exception support header (nested_exception class) for -*- C++ -*-
// Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/nested_exception.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{exception}
*/
#ifndef _GLIBCXX_NESTED_EXCEPTION_H
#define _GLIBCXX_NESTED_EXCEPTION_H 1
#pragma GCC visibility push(default)
#ifndef __GXX_EXPERIMENTAL_CXX0X__
# include <bits/c++0x_warning.h>
#else
#include <bits/c++config.h>
#if !defined(_GLIBCXX_ATOMIC_BUILTINS_4)
# error This platform does not support exception propagation.
#endif
extern "C++" {
namespace std
{
/**
* @addtogroup exceptions
* @{
*/
/// Exception class with exception_ptr data member.
class nested_exception
{
exception_ptr _M_ptr;
public:
nested_exception() throw() : _M_ptr(current_exception()) { }
nested_exception(const nested_exception&) = default;
nested_exception& operator=(const nested_exception&) = default;
virtual ~nested_exception();
void
rethrow_nested() const __attribute__ ((__noreturn__))
{ rethrow_exception(_M_ptr); }
exception_ptr
nested_ptr() const
{ return _M_ptr; }
};
template<typename _Except>
struct _Nested_exception : public _Except, public nested_exception
{
explicit _Nested_exception(_Except&& __ex)
: _Except(static_cast<_Except&&>(__ex))
{ }
};
template<typename _Ex>
struct __get_nested_helper
{
static const nested_exception*
_S_get(const _Ex& __ex)
{ return dynamic_cast<const nested_exception*>(&__ex); }
};
template<typename _Ex>
struct __get_nested_helper<_Ex*>
{
static const nested_exception*
_S_get(const _Ex* __ex)
{ return dynamic_cast<const nested_exception*>(__ex); }
};
template<typename _Ex>
inline const nested_exception*
__get_nested_exception(const _Ex& __ex)
{ return __get_nested_helper<_Ex>::_S_get(__ex); }
template<typename _Ex>
void
__throw_with_nested(_Ex&&, const nested_exception* = 0)
__attribute__ ((__noreturn__));
template<typename _Ex>
void
__throw_with_nested(_Ex&&, ...) __attribute__ ((__noreturn__));
// This function should never be called, but is needed to avoid a warning
// about ambiguous base classes when instantiating throw_with_nested<_Ex>()
// with a type that has an accessible nested_exception base.
template<typename _Ex>
inline void
__throw_with_nested(_Ex&& __ex, const nested_exception*)
{ throw __ex; }
template<typename _Ex>
inline void
__throw_with_nested(_Ex&& __ex, ...)
{ throw _Nested_exception<_Ex>(static_cast<_Ex&&>(__ex)); }
template<typename _Ex>
void
throw_with_nested(_Ex __ex) __attribute__ ((__noreturn__));
/// If @p __ex is derived from nested_exception, @p __ex.
/// Else, an implementation-defined object derived from both.
template<typename _Ex>
inline void
throw_with_nested(_Ex __ex)
{
if (__get_nested_exception(__ex))
throw __ex;
__throw_with_nested(static_cast<_Ex&&>(__ex), &__ex);
}
/// If @p __ex is derived from nested_exception, @p __ex.rethrow_nested().
template<typename _Ex>
inline void
rethrow_if_nested(const _Ex& __ex)
{
if (const nested_exception* __nested = __get_nested_exception(__ex))
__nested->rethrow_nested();
}
/// Overload, See N2619
inline void
rethrow_if_nested(const nested_exception& __ex)
{ __ex.rethrow_nested(); }
// @} group exceptions
} // namespace std
} // extern "C++"
#endif // __GXX_EXPERIMENTAL_CXX0X__
#pragma GCC visibility pop
#endif // _GLIBCXX_NESTED_EXCEPTION_H
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