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[/] [openrisc/] [tags/] [gnu-dev/] [fsf-gcc-snapshot-1-mar-12/] [or1k-gcc/] [libstdc++-v3/] [libsupc++/] [nested_exception.h] - Rev 783
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// 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 ATOMIC_INT_LOCK_FREE < 2 # 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() noexcept : _M_ptr(current_exception()) { } nested_exception(const nested_exception&) = default; nested_exception& operator=(const nested_exception&) = default; virtual ~nested_exception() noexcept; 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