exception_ptr.h
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// Exception Handling support header (exception_ptr class) for -*- C++ -*-
// Copyright (C) 2008-2014 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
// GCC 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.
//
// GCC 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/exception_ptr.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{exception}
*/
#ifndef _EXCEPTION_PTR_H
#define _EXCEPTION_PTR_H
#pragma GCC visibility push(default)
#include <bits/c++config.h>
#include <bits/exception_defines.h>
#if ATOMIC_INT_LOCK_FREE < 2
# error This platform does not support exception propagation.
#endif
extern "C++" {
namespace std
{
class type_info;
/**
* @addtogroup exceptions
* @{
*/
namespace __exception_ptr
{
class exception_ptr;
}
using __exception_ptr::exception_ptr;
/** Obtain an exception_ptr to the currently handled exception. If there
* is none, or the currently handled exception is foreign, return the null
* value.
*/
exception_ptr current_exception() _GLIBCXX_USE_NOEXCEPT;
/// Throw the object pointed to by the exception_ptr.
void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));
namespace __exception_ptr
{
/**
* @brief An opaque pointer to an arbitrary exception.
* @ingroup exceptions
*/
class exception_ptr
{
void* _M_exception_object;
explicit exception_ptr(void* __e) _GLIBCXX_USE_NOEXCEPT;
void _M_addref() _GLIBCXX_USE_NOEXCEPT;
void _M_release() _GLIBCXX_USE_NOEXCEPT;
void *_M_get() const _GLIBCXX_NOEXCEPT __attribute__ ((__pure__));
friend exception_ptr std::current_exception() _GLIBCXX_USE_NOEXCEPT;
friend void std::rethrow_exception(exception_ptr);
public:
exception_ptr() _GLIBCXX_USE_NOEXCEPT;
exception_ptr(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT;
#if __cplusplus >= 201103L
exception_ptr(nullptr_t) noexcept
: _M_exception_object(0)
{ }
exception_ptr(exception_ptr&& __o) noexcept
: _M_exception_object(__o._M_exception_object)
{ __o._M_exception_object = 0; }
#endif
#if (__cplusplus < 201103L) || defined (_GLIBCXX_EH_PTR_COMPAT)
typedef void (exception_ptr::*__safe_bool)();
// For construction from nullptr or 0.
exception_ptr(__safe_bool) _GLIBCXX_USE_NOEXCEPT;
#endif
exception_ptr&
operator=(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT;
#if __cplusplus >= 201103L
exception_ptr&
operator=(exception_ptr&& __o) noexcept
{
exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this);
return *this;
}
#endif
~exception_ptr() _GLIBCXX_USE_NOEXCEPT;
void
swap(exception_ptr&) _GLIBCXX_USE_NOEXCEPT;
#ifdef _GLIBCXX_EH_PTR_COMPAT
// Retained for compatibility with CXXABI_1.3.
void _M_safe_bool_dummy() _GLIBCXX_USE_NOEXCEPT
__attribute__ ((__const__));
bool operator!() const _GLIBCXX_USE_NOEXCEPT
__attribute__ ((__pure__));
operator __safe_bool() const _GLIBCXX_USE_NOEXCEPT;
#endif
#if __cplusplus >= 201103L
explicit operator bool() const
{ return _M_exception_object; }
#endif
friend bool
operator==(const exception_ptr&, const exception_ptr&)
_GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
const class std::type_info*
__cxa_exception_type() const _GLIBCXX_USE_NOEXCEPT
__attribute__ ((__pure__));
};
bool
operator==(const exception_ptr&, const exception_ptr&)
_GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
bool
operator!=(const exception_ptr&, const exception_ptr&)
_GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
inline void
swap(exception_ptr& __lhs, exception_ptr& __rhs)
{ __lhs.swap(__rhs); }
} // namespace __exception_ptr
/// Obtain an exception_ptr pointing to a copy of the supplied object.
template<typename _Ex>
exception_ptr
make_exception_ptr(_Ex __ex) _GLIBCXX_USE_NOEXCEPT
{
__try
{
#ifdef __EXCEPTIONS
throw __ex;
#endif
}
__catch(...)
{
return current_exception();
}
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 1130. copy_exception name misleading
/// Obtain an exception_ptr pointing to a copy of the supplied object.
/// This function is deprecated, use std::make_exception_ptr instead.
template<typename _Ex>
exception_ptr
copy_exception(_Ex __ex) _GLIBCXX_USE_NOEXCEPT _GLIBCXX_DEPRECATED;
template<typename _Ex>
exception_ptr
copy_exception(_Ex __ex) _GLIBCXX_USE_NOEXCEPT
{ return std::make_exception_ptr<_Ex>(__ex); }
// @} group exceptions
} // namespace std
} // extern "C++"
#pragma GCC visibility pop
#endif
c++config.h
std::rethrow_exception
void rethrow_exception(exception_ptr) __attribute__((__noreturn__))
Throw the object pointed to by the exception_ptr.
std::copy_exception
exception_ptr copy_exception(_Ex __ex) noexcept 1
Obtain an exception_ptr pointing to a copy of the supplied object. This function is deprecated...
Definition: exception_ptr.h:193
exception_defines.h
std::type_info
Part of RTTI.
Definition: typeinfo:88
std::make_exception_ptr
exception_ptr make_exception_ptr(_Ex __ex) noexcept
Obtain an exception_ptr pointing to a copy of the supplied object.
Definition: exception_ptr.h:169
std::__exception_ptr::exception_ptr
An opaque pointer to an arbitrary exception.
Definition: exception_ptr.h:75
std::current_exception
exception_ptr current_exception() noexcept