167 lines
4.6 KiB
C++
167 lines
4.6 KiB
C++
// Nested Exception support header (nested_exception class) for -*- C++ -*-
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// Copyright (C) 2009-2014 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 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
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/nested_exception.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{exception}
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*/
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#ifndef _GLIBCXX_NESTED_EXCEPTION_H
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#define _GLIBCXX_NESTED_EXCEPTION_H 1
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#pragma GCC visibility push(default)
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
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#else
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#include <bits/c++config.h>
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#if ATOMIC_INT_LOCK_FREE < 2
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# error This platform does not support exception propagation.
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#endif
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extern "C++" {
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namespace std
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{
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/**
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* @addtogroup exceptions
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* @{
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*/
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/// Exception class with exception_ptr data member.
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class nested_exception
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{
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exception_ptr _M_ptr;
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public:
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nested_exception() noexcept : _M_ptr(current_exception()) { }
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nested_exception(const nested_exception&) = default;
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nested_exception& operator=(const nested_exception&) = default;
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virtual ~nested_exception() noexcept;
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void
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rethrow_nested() const __attribute__ ((__noreturn__))
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{ rethrow_exception(_M_ptr); }
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exception_ptr
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nested_ptr() const
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{ return _M_ptr; }
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};
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template<typename _Except>
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struct _Nested_exception : public _Except, public nested_exception
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{
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explicit _Nested_exception(_Except&& __ex)
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: _Except(static_cast<_Except&&>(__ex))
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{ }
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};
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template<typename _Ex>
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struct __get_nested_helper
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{
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static const nested_exception*
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_S_get(const _Ex& __ex)
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{ return dynamic_cast<const nested_exception*>(&__ex); }
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};
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template<typename _Ex>
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struct __get_nested_helper<_Ex*>
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{
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static const nested_exception*
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_S_get(const _Ex* __ex)
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{ return dynamic_cast<const nested_exception*>(__ex); }
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};
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template<typename _Ex>
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inline const nested_exception*
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__get_nested_exception(const _Ex& __ex)
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{ return __get_nested_helper<_Ex>::_S_get(__ex); }
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template<typename _Ex>
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void
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__throw_with_nested(_Ex&&, const nested_exception* = 0)
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__attribute__ ((__noreturn__));
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template<typename _Ex>
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void
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__throw_with_nested(_Ex&&, ...) __attribute__ ((__noreturn__));
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// This function should never be called, but is needed to avoid a warning
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// about ambiguous base classes when instantiating throw_with_nested<_Ex>()
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// with a type that has an accessible nested_exception base.
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template<typename _Ex>
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inline void
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__throw_with_nested(_Ex&& __ex, const nested_exception*)
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{ throw __ex; }
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template<typename _Ex>
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inline void
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__throw_with_nested(_Ex&& __ex, ...)
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{ throw _Nested_exception<_Ex>(static_cast<_Ex&&>(__ex)); }
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template<typename _Ex>
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void
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throw_with_nested(_Ex __ex) __attribute__ ((__noreturn__));
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/// If @p __ex is derived from nested_exception, @p __ex.
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/// Else, an implementation-defined object derived from both.
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template<typename _Ex>
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inline void
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throw_with_nested(_Ex __ex)
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{
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if (__get_nested_exception(__ex))
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throw __ex;
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__throw_with_nested(static_cast<_Ex&&>(__ex), &__ex);
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}
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/// If @p __ex is derived from nested_exception, @p __ex.rethrow_nested().
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template<typename _Ex>
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inline void
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rethrow_if_nested(const _Ex& __ex)
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{
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if (const nested_exception* __nested = __get_nested_exception(__ex))
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__nested->rethrow_nested();
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}
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/// Overload, See N2619
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inline void
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rethrow_if_nested(const nested_exception& __ex)
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{ __ex.rethrow_nested(); }
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// @} group exceptions
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} // 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
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