0,0 → 1,173 |
// Nested Exception support header (nested_exception class) for -*- C++ -*- |
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// Copyright (C) 2009-2015 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. |
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// 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. |
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// 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. |
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// 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/>. |
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/** @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} |
*/ |
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#ifndef _GLIBCXX_NESTED_EXCEPTION_H |
#define _GLIBCXX_NESTED_EXCEPTION_H 1 |
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#pragma GCC visibility push(default) |
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#if __cplusplus < 201103L |
# include <bits/c++0x_warning.h> |
#else |
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#include <bits/c++config.h> |
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#if ATOMIC_INT_LOCK_FREE < 2 |
# error This platform does not support exception propagation. |
#endif |
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extern "C++" { |
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namespace std |
{ |
/** |
* @addtogroup exceptions |
* @{ |
*/ |
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/// Exception class with exception_ptr data member. |
class nested_exception |
{ |
exception_ptr _M_ptr; |
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public: |
nested_exception() noexcept : _M_ptr(current_exception()) { } |
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nested_exception(const nested_exception&) noexcept = default; |
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nested_exception& operator=(const nested_exception&) noexcept = default; |
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virtual ~nested_exception() noexcept; |
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[[noreturn]] |
void |
rethrow_nested() const |
{ |
if (_M_ptr) |
rethrow_exception(_M_ptr); |
std::terminate(); |
} |
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exception_ptr |
nested_ptr() const noexcept |
{ return _M_ptr; } |
}; |
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template<typename _Except> |
struct _Nested_exception : public _Except, public nested_exception |
{ |
explicit _Nested_exception(const _Except& __ex) |
: _Except(__ex) |
{ } |
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explicit _Nested_exception(_Except&& __ex) |
: _Except(static_cast<_Except&&>(__ex)) |
{ } |
}; |
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template<typename _Tp, |
bool __with_nested = !__is_base_of(nested_exception, _Tp)> |
struct _Throw_with_nested_impl |
{ |
template<typename _Up> |
static void _S_throw(_Up&& __t) |
{ throw _Nested_exception<_Tp>{static_cast<_Up&&>(__t)}; } |
}; |
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template<typename _Tp> |
struct _Throw_with_nested_impl<_Tp, false> |
{ |
template<typename _Up> |
static void _S_throw(_Up&& __t) |
{ throw static_cast<_Up&&>(__t); } |
}; |
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template<typename _Tp, bool = __is_class(_Tp) && !__is_final(_Tp)> |
struct _Throw_with_nested_helper : _Throw_with_nested_impl<_Tp> |
{ }; |
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template<typename _Tp> |
struct _Throw_with_nested_helper<_Tp, false> |
: _Throw_with_nested_impl<_Tp, false> |
{ }; |
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template<typename _Tp> |
struct _Throw_with_nested_helper<_Tp&, false> |
: _Throw_with_nested_helper<_Tp> |
{ }; |
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template<typename _Tp> |
struct _Throw_with_nested_helper<_Tp&&, false> |
: _Throw_with_nested_helper<_Tp> |
{ }; |
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/// If @p __t is derived from nested_exception, throws @p __t. |
/// Else, throws an implementation-defined object derived from both. |
template<typename _Tp> |
[[noreturn]] |
inline void |
throw_with_nested(_Tp&& __t) |
{ |
_Throw_with_nested_helper<_Tp>::_S_throw(static_cast<_Tp&&>(__t)); |
} |
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template<typename _Tp, bool = __is_polymorphic(_Tp)> |
struct _Rethrow_if_nested_impl |
{ |
static void _S_rethrow(const _Tp& __t) |
{ |
if (auto __tp = dynamic_cast<const nested_exception*>(&__t)) |
__tp->rethrow_nested(); |
} |
}; |
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template<typename _Tp> |
struct _Rethrow_if_nested_impl<_Tp, false> |
{ |
static void _S_rethrow(const _Tp&) { } |
}; |
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/// If @p __ex is derived from nested_exception, @p __ex.rethrow_nested(). |
template<typename _Ex> |
inline void |
rethrow_if_nested(const _Ex& __ex) |
{ |
_Rethrow_if_nested_impl<_Ex>::_S_rethrow(__ex); |
} |
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// @} group exceptions |
} // namespace std |
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} // extern "C++" |
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#endif // C++11 |
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#pragma GCC visibility pop |
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#endif // _GLIBCXX_NESTED_EXCEPTION_H |