192 lines
4.9 KiB
C++
192 lines
4.9 KiB
C++
// Exception Handling support header (exception_ptr class) for -*- C++ -*-
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// Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC 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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//
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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/exception_ptr.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 _EXCEPTION_PTR_H
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#define _EXCEPTION_PTR_H
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#pragma GCC visibility push(default)
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#include <bits/c++config.h>
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#include <bits/exception_defines.h>
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#if !defined(_GLIBCXX_ATOMIC_BUILTINS_4)
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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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namespace __exception_ptr
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{
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class exception_ptr;
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}
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using __exception_ptr::exception_ptr;
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/** Obtain an exception_ptr to the currently handled exception. If there
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* is none, or the currently handled exception is foreign, return the null
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* value.
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*/
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exception_ptr current_exception() throw();
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/// Throw the object pointed to by the exception_ptr.
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void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));
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namespace __exception_ptr
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{
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/**
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* @brief An opaque pointer to an arbitrary exception.
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* @ingroup exceptions
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*/
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class exception_ptr
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{
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void* _M_exception_object;
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explicit exception_ptr(void* __e) throw();
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void _M_addref() throw();
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void _M_release() throw();
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void *_M_get() const throw() __attribute__ ((__pure__));
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friend exception_ptr std::current_exception() throw();
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friend void std::rethrow_exception(exception_ptr);
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public:
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exception_ptr() throw();
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exception_ptr(const exception_ptr&) throw();
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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exception_ptr(nullptr_t) throw()
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: _M_exception_object(0)
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{ }
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exception_ptr(exception_ptr&& __o) throw()
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: _M_exception_object(__o._M_exception_object)
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{ __o._M_exception_object = 0; }
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#else
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typedef void (exception_ptr::*__safe_bool)();
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// For construction from nullptr or 0.
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exception_ptr(__safe_bool) throw();
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#endif
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exception_ptr&
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operator=(const exception_ptr&) throw();
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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exception_ptr&
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operator=(exception_ptr&& __o) throw()
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{
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exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this);
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return *this;
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}
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#endif
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~exception_ptr() throw();
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void
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swap(exception_ptr&) throw();
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#ifdef _GLIBCXX_EH_PTR_COMPAT
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// Retained for compatibility with CXXABI_1.3.
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void _M_safe_bool_dummy() throw() __attribute__ ((__const__));
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bool operator!() const throw() __attribute__ ((__pure__));
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operator __safe_bool() const throw();
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#endif
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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explicit operator bool() const
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{ return _M_exception_object; }
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#endif
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friend bool
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operator==(const exception_ptr&, const exception_ptr&) throw()
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__attribute__ ((__pure__));
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const type_info*
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__cxa_exception_type() const throw() __attribute__ ((__pure__));
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};
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bool
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operator==(const exception_ptr&, const exception_ptr&) throw()
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__attribute__ ((__pure__));
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bool
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operator!=(const exception_ptr&, const exception_ptr&) throw()
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__attribute__ ((__pure__));
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inline void
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swap(exception_ptr& __lhs, exception_ptr& __rhs)
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{ __lhs.swap(__rhs); }
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} // namespace __exception_ptr
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/// Obtain an exception_ptr pointing to a copy of the supplied object.
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template<typename _Ex>
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exception_ptr
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copy_exception(_Ex __ex) throw()
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{
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__try
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{
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#ifdef __EXCEPTIONS
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throw __ex;
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#endif
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}
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__catch(...)
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{
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return current_exception();
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}
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}
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 1130. copy_exception name misleading
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/// Obtain an exception_ptr pointing to a copy of the supplied object.
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template<typename _Ex>
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exception_ptr
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make_exception_ptr(_Ex __ex) throw()
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{ return std::copy_exception<_Ex>(__ex); }
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// @} group exceptions
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} // namespace std
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} // extern "C++"
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#pragma GCC visibility pop
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#endif
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