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// Exception Handling support header (exception_ptr class) for -*- C++ -*-

// Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation

//

// 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

{

  /**

   * @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 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

    copy_exception(_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.

  template<typename _Ex>

    exception_ptr

    make_exception_ptr(_Ex __ex) _GLIBCXX_USE_NOEXCEPT

    { return std::copy_exception<_Ex>(__ex); }

  // @} group exceptions

} // namespace std

} // extern "C++"

#pragma GCC visibility pop

#endif