1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
// Nested Exception support header (nested_exception class) for -*- C++ -*-
// Copyright (C) 2009-2016 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>
#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&) 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>
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>
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 remove_reference<_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
|
