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Preview: nested_exception.h Size: 4.69 KB
/usr/include/c++/8/bits/nested_exception.h
// Nested Exception support header (nested_exception class) for -*- C++ -*-

// Copyright (C) 2009-2018 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)

#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else

#include <bits/c++config.h>
#include <bits/move.h>

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&) noexcept = default;

    nested_exception& operator=(const nested_exception&) noexcept = default;

    virtual ~nested_exception() noexcept;

    [[noreturn]]
    void
    rethrow_nested() const
    {
      if (_M_ptr)
	rethrow_exception(_M_ptr);
      std::terminate();
    }

    exception_ptr
    nested_ptr() const noexcept
    { return _M_ptr; }
  };

  template<typename _Except>
    struct _Nested_exception : public _Except, public nested_exception
    {
      explicit _Nested_exception(const _Except& __ex)
      : _Except(__ex)
      { }

      explicit _Nested_exception(_Except&& __ex)
      : _Except(static_cast<_Except&&>(__ex))
      { }
    };

  // [except.nested]/8
  // Throw an exception of unspecified type that is publicly derived from
  // both remove_reference_t<_Tp> and nested_exception.
  template<typename _Tp>
    [[noreturn]]
    inline void
    __throw_with_nested_impl(_Tp&& __t, true_type)
    {
      using _Up = typename remove_reference<_Tp>::type;
      throw _Nested_exception<_Up>{std::forward<_Tp>(__t)};
    }

  template<typename _Tp>
    [[noreturn]]
    inline void
    __throw_with_nested_impl(_Tp&& __t, false_type)
    { throw std::forward<_Tp>(__t); }

  /// If @p __t is derived from nested_exception, throws @p __t.
  /// Else, throws an implementation-defined object derived from both.
  template<typename _Tp>
    [[noreturn]]
    inline void
    throw_with_nested(_Tp&& __t)
    {
      using _Up = typename decay<_Tp>::type;
      using _CopyConstructible
	= __and_<is_copy_constructible<_Up>, is_move_constructible<_Up>>;
      static_assert(_CopyConstructible::value,
	  "throw_with_nested argument must be CopyConstructible");
      using __nest = __and_<is_class<_Up>, __bool_constant<!__is_final(_Up)>,
			    __not_<is_base_of<nested_exception, _Up>>>;
      std::__throw_with_nested_impl(std::forward<_Tp>(__t), __nest{});
    }

  // Determine if dynamic_cast<const nested_exception&> would be well-formed.
  template<typename _Tp>
    using __rethrow_if_nested_cond = typename enable_if<
      __and_<is_polymorphic<_Tp>,
	     __or_<__not_<is_base_of<nested_exception, _Tp>>,
		   is_convertible<_Tp*, nested_exception*>>>::value
    >::type;

  // Attempt dynamic_cast to nested_exception and call rethrow_nested().
  template<typename _Ex>
    inline __rethrow_if_nested_cond<_Ex>
    __rethrow_if_nested_impl(const _Ex* __ptr)
    {
      if (auto __ne_ptr = dynamic_cast<const nested_exception*>(__ptr))
	__ne_ptr->rethrow_nested();
    }

  // Otherwise, no effects.
  inline void
  __rethrow_if_nested_impl(const void*)
  { }

  /// If @p __ex is derived from nested_exception, @p __ex.rethrow_nested().
  template<typename _Ex>
    inline void
    rethrow_if_nested(const _Ex& __ex)
    { std::__rethrow_if_nested_impl(std::__addressof(__ex)); }

  // @} group exceptions
} // namespace std

} // extern "C++"

#endif // C++11

#pragma GCC visibility pop

#endif // _GLIBCXX_NESTED_EXCEPTION_H

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algorithmfwd.h
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allocated_ptr.h
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allocator.h
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alloc_traits.h
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atomic_base.h
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atomic_futex.h
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atomic_lockfree_defines.h
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basic_ios.h
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basic_ios.tcc
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basic_string.h
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basic_string.tcc
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boost_concept_check.h
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c++0x_warning.h
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char_traits.h
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codecvt.h
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concept_check.h
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cpp_type_traits.h
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cxxabi_forced.h
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cxxabi_init_exception.h
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deque.tcc
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enable_special_members.h
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exception.h
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exception_defines.h
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exception_ptr.h
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forward_list.h
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forward_list.tcc
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fstream.tcc
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fs_dir.h
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fs_fwd.h
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fs_ops.h
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fs_path.h
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functexcept.h
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functional_hash.h
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gslice.h
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gslice_array.h
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hashtable.h
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hashtable_policy.h
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hash_bytes.h
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indirect_array.h
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invoke.h
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ios_base.h
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istream.tcc
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list.tcc
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localefwd.h
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locale_classes.h
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locale_classes.tcc
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locale_conv.h
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locale_facets.h
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locale_facets.tcc
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locale_facets_nonio.h
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locale_facets_nonio.tcc
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mask_array.h
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memoryfwd.h
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move.h
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nested_exception.h
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node_handle.h
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ostream.tcc
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ostream_insert.h
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parse_numbers.h
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postypes.h
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predefined_ops.h
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ptr_traits.h
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quoted_string.h
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random.h
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random.tcc
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range_access.h
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refwrap.h
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regex.h
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regex.tcc
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regex_automaton.h
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regex_automaton.tcc
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regex_compiler.h
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regex_compiler.tcc
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regex_constants.h
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regex_error.h
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regex_executor.h
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regex_executor.tcc
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regex_scanner.h
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regex_scanner.tcc
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shared_ptr.h
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shared_ptr_atomic.h
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shared_ptr_base.h
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slice_array.h
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specfun.h
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sstream.tcc
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std_abs.h
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std_function.h
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std_mutex.h
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stl_algo.h
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stl_algobase.h
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stl_bvector.h
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stl_construct.h
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stl_deque.h
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stl_function.h
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stl_heap.h
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stl_iterator.h
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stl_iterator_base_funcs.h
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stl_iterator_base_types.h
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stl_list.h
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stl_map.h
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stl_multimap.h
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stl_multiset.h
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stl_numeric.h
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stl_pair.h
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stl_queue.h
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stl_raw_storage_iter.h
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stl_relops.h
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stl_set.h
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stl_stack.h
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stl_tempbuf.h
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stl_tree.h
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stl_uninitialized.h
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stl_vector.h
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streambuf.tcc
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streambuf_iterator.h
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stream_iterator.h
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stringfwd.h
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string_view.tcc
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uniform_int_dist.h
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unique_ptr.h
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unordered_map.h
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unordered_set.h
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uses_allocator.h
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valarray_after.h
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valarray_array.h
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valarray_before.h
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vector.tcc
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