2009-05-12 23:08:00 +02:00
|
|
|
// Nested Exception support header (nested_exception class) for -*- C++ -*-
|
|
|
|
|
2020-01-01 12:51:42 +01:00
|
|
|
// Copyright (C) 2009-2020 Free Software Foundation, Inc.
|
2009-05-12 23:08:00 +02:00
|
|
|
//
|
|
|
|
// 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/>.
|
|
|
|
|
2011-01-15 01:27:10 +01:00
|
|
|
/** @file bits/nested_exception.h
|
2010-12-19 10:21:16 +01:00
|
|
|
* This is an internal header file, included by other library headers.
|
|
|
|
* Do not attempt to use it directly. @headername{exception}
|
2009-05-12 23:08:00 +02:00
|
|
|
*/
|
|
|
|
|
|
|
|
#ifndef _GLIBCXX_NESTED_EXCEPTION_H
|
|
|
|
#define _GLIBCXX_NESTED_EXCEPTION_H 1
|
|
|
|
|
|
|
|
#pragma GCC visibility push(default)
|
|
|
|
|
2012-11-10 18:27:22 +01:00
|
|
|
#if __cplusplus < 201103L
|
2010-02-18 18:20:16 +01:00
|
|
|
# include <bits/c++0x_warning.h>
|
2009-05-12 23:08:00 +02:00
|
|
|
#else
|
|
|
|
|
|
|
|
#include <bits/c++config.h>
|
2015-12-11 13:04:23 +01:00
|
|
|
#include <bits/move.h>
|
2009-05-12 23:08:00 +02:00
|
|
|
|
|
|
|
extern "C++" {
|
|
|
|
|
|
|
|
namespace std
|
|
|
|
{
|
|
|
|
/**
|
|
|
|
* @addtogroup exceptions
|
|
|
|
* @{
|
|
|
|
*/
|
|
|
|
|
2009-11-09 23:09:30 +01:00
|
|
|
/// Exception class with exception_ptr data member.
|
2009-05-12 23:08:00 +02:00
|
|
|
class nested_exception
|
|
|
|
{
|
2009-11-09 23:09:30 +01:00
|
|
|
exception_ptr _M_ptr;
|
|
|
|
|
2009-05-12 23:08:00 +02:00
|
|
|
public:
|
2011-12-06 21:03:25 +01:00
|
|
|
nested_exception() noexcept : _M_ptr(current_exception()) { }
|
2009-05-12 23:08:00 +02:00
|
|
|
|
2014-08-15 17:22:44 +02:00
|
|
|
nested_exception(const nested_exception&) noexcept = default;
|
2009-05-12 23:08:00 +02:00
|
|
|
|
2014-08-15 17:22:44 +02:00
|
|
|
nested_exception& operator=(const nested_exception&) noexcept = default;
|
2009-05-12 23:08:00 +02:00
|
|
|
|
2011-12-06 21:03:25 +01:00
|
|
|
virtual ~nested_exception() noexcept;
|
2009-05-12 23:08:00 +02:00
|
|
|
|
2014-08-15 17:22:44 +02:00
|
|
|
[[noreturn]]
|
2009-05-12 23:08:00 +02:00
|
|
|
void
|
2014-08-15 17:22:44 +02:00
|
|
|
rethrow_nested() const
|
|
|
|
{
|
|
|
|
if (_M_ptr)
|
|
|
|
rethrow_exception(_M_ptr);
|
|
|
|
std::terminate();
|
|
|
|
}
|
2009-05-12 23:08:00 +02:00
|
|
|
|
|
|
|
exception_ptr
|
2014-08-15 17:22:44 +02:00
|
|
|
nested_ptr() const noexcept
|
2009-05-12 23:08:00 +02:00
|
|
|
{ return _M_ptr; }
|
|
|
|
};
|
|
|
|
|
2019-05-04 16:35:29 +02:00
|
|
|
/// @cond undocumented
|
|
|
|
|
2009-05-12 23:08:00 +02:00
|
|
|
template<typename _Except>
|
|
|
|
struct _Nested_exception : public _Except, public nested_exception
|
|
|
|
{
|
2014-08-15 17:22:44 +02:00
|
|
|
explicit _Nested_exception(const _Except& __ex)
|
|
|
|
: _Except(__ex)
|
|
|
|
{ }
|
|
|
|
|
2009-11-09 23:09:30 +01:00
|
|
|
explicit _Nested_exception(_Except&& __ex)
|
2009-05-12 23:08:00 +02:00
|
|
|
: _Except(static_cast<_Except&&>(__ex))
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
|
2016-10-11 12:33:36 +02:00
|
|
|
// [except.nested]/8
|
|
|
|
// Throw an exception of unspecified type that is publicly derived from
|
|
|
|
// both remove_reference_t<_Tp> and nested_exception.
|
2014-08-15 17:22:44 +02:00
|
|
|
template<typename _Tp>
|
2017-12-01 16:10:13 +01:00
|
|
|
[[noreturn]]
|
2016-10-11 12:33:36 +02:00
|
|
|
inline void
|
|
|
|
__throw_with_nested_impl(_Tp&& __t, true_type)
|
2009-05-12 23:08:00 +02:00
|
|
|
{
|
2016-10-11 12:33:36 +02:00
|
|
|
using _Up = typename remove_reference<_Tp>::type;
|
|
|
|
throw _Nested_exception<_Up>{std::forward<_Tp>(__t)};
|
|
|
|
}
|
2014-08-15 17:22:44 +02:00
|
|
|
|
|
|
|
template<typename _Tp>
|
2017-12-01 16:10:13 +01:00
|
|
|
[[noreturn]]
|
2016-10-11 12:33:36 +02:00
|
|
|
inline void
|
|
|
|
__throw_with_nested_impl(_Tp&& __t, false_type)
|
|
|
|
{ throw std::forward<_Tp>(__t); }
|
2014-08-15 17:22:44 +02:00
|
|
|
|
2019-05-04 16:35:29 +02:00
|
|
|
/// @endcond
|
|
|
|
|
2014-08-15 17:22:44 +02:00
|
|
|
/// If @p __t is derived from nested_exception, throws @p __t.
|
|
|
|
/// Else, throws an implementation-defined object derived from both.
|
|
|
|
template<typename _Tp>
|
|
|
|
[[noreturn]]
|
2009-05-12 23:08:00 +02:00
|
|
|
inline void
|
2014-08-15 17:22:44 +02:00
|
|
|
throw_with_nested(_Tp&& __t)
|
|
|
|
{
|
2017-01-17 16:26:06 +01:00
|
|
|
using _Up = typename decay<_Tp>::type;
|
2016-10-11 12:33:36 +02:00
|
|
|
using _CopyConstructible
|
|
|
|
= __and_<is_copy_constructible<_Up>, is_move_constructible<_Up>>;
|
|
|
|
static_assert(_CopyConstructible::value,
|
|
|
|
"throw_with_nested argument must be CopyConstructible");
|
|
|
|
using __nest = __and_<is_class<_Up>, __bool_constant<!__is_final(_Up)>,
|
|
|
|
__not_<is_base_of<nested_exception, _Up>>>;
|
2016-10-12 13:20:29 +02:00
|
|
|
std::__throw_with_nested_impl(std::forward<_Tp>(__t), __nest{});
|
2014-08-15 17:22:44 +02:00
|
|
|
}
|
2009-05-12 23:08:00 +02:00
|
|
|
|
2019-05-04 16:35:29 +02:00
|
|
|
/// @cond undocumented
|
|
|
|
|
2016-10-11 12:33:36 +02:00
|
|
|
// Determine if dynamic_cast<const nested_exception&> would be well-formed.
|
2014-08-15 17:22:44 +02:00
|
|
|
template<typename _Tp>
|
2016-10-11 12:33:36 +02:00
|
|
|
using __rethrow_if_nested_cond = typename enable_if<
|
|
|
|
__and_<is_polymorphic<_Tp>,
|
|
|
|
__or_<__not_<is_base_of<nested_exception, _Tp>>,
|
|
|
|
is_convertible<_Tp*, nested_exception*>>>::value
|
|
|
|
>::type;
|
|
|
|
|
|
|
|
// Attempt dynamic_cast to nested_exception and call rethrow_nested().
|
|
|
|
template<typename _Ex>
|
|
|
|
inline __rethrow_if_nested_cond<_Ex>
|
|
|
|
__rethrow_if_nested_impl(const _Ex* __ptr)
|
2009-05-12 23:08:00 +02:00
|
|
|
{
|
2016-10-11 12:33:36 +02:00
|
|
|
if (auto __ne_ptr = dynamic_cast<const nested_exception*>(__ptr))
|
|
|
|
__ne_ptr->rethrow_nested();
|
|
|
|
}
|
|
|
|
|
|
|
|
// Otherwise, no effects.
|
|
|
|
inline void
|
|
|
|
__rethrow_if_nested_impl(const void*)
|
|
|
|
{ }
|
2009-05-12 23:08:00 +02:00
|
|
|
|
2019-05-04 16:35:29 +02:00
|
|
|
/// @endcond
|
|
|
|
|
2009-11-09 23:09:30 +01:00
|
|
|
/// If @p __ex is derived from nested_exception, @p __ex.rethrow_nested().
|
2009-05-12 23:08:00 +02:00
|
|
|
template<typename _Ex>
|
|
|
|
inline void
|
|
|
|
rethrow_if_nested(const _Ex& __ex)
|
2016-10-11 12:33:36 +02:00
|
|
|
{ std::__rethrow_if_nested_impl(std::__addressof(__ex)); }
|
2009-05-12 23:08:00 +02:00
|
|
|
|
|
|
|
// @} group exceptions
|
|
|
|
} // namespace std
|
|
|
|
|
|
|
|
} // extern "C++"
|
|
|
|
|
2012-11-10 18:27:22 +01:00
|
|
|
#endif // C++11
|
2009-05-12 23:08:00 +02:00
|
|
|
|
|
|
|
#pragma GCC visibility pop
|
|
|
|
|
|
|
|
#endif // _GLIBCXX_NESTED_EXCEPTION_H
|