2 //===-------------------------- exception ---------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP_EXCEPTION
12 #define _LIBCPP_EXCEPTION
24 exception(const exception&) noexcept;
25 exception& operator=(const exception&) noexcept;
26 virtual ~exception() noexcept;
27 virtual const char* what() const noexcept;
34 bad_exception() noexcept;
35 bad_exception(const bad_exception&) noexcept;
36 bad_exception& operator=(const bad_exception&) noexcept;
37 virtual ~bad_exception() noexcept;
38 virtual const char* what() const noexcept;
41 typedef void (*unexpected_handler)();
42 unexpected_handler set_unexpected(unexpected_handler f ) noexcept;
43 unexpected_handler get_unexpected() noexcept;
44 [[noreturn]] void unexpected();
46 typedef void (*terminate_handler)();
47 terminate_handler set_terminate(terminate_handler f ) noexcept;
48 terminate_handler get_terminate() noexcept;
49 [[noreturn]] void terminate() noexcept;
51 bool uncaught_exception() noexcept;
53 typedef unspecified exception_ptr;
55 exception_ptr current_exception() noexcept;
56 void rethrow_exception [[noreturn]] (exception_ptr p);
57 template<class E> exception_ptr make_exception_ptr(E e) noexcept;
59 class nested_exception
62 nested_exception() noexcept;
63 nested_exception(const nested_exception&) noexcept = default;
64 nested_exception& operator=(const nested_exception&) noexcept = default;
65 virtual ~nested_exception() = default;
68 [[noreturn]] void rethrow_nested() const;
69 exception_ptr nested_ptr() const noexcept;
72 template <class T> [[noreturn]] void throw_with_nested(T&& t);
73 template <class E> void rethrow_if_nested(const E& e);
81 #include <type_traits>
83 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
84 #pragma GCC system_header
87 namespace std // purposefully not using versioning namespace
90 class _LIBCPP_EXCEPTION_ABI exception
93 _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
94 virtual ~exception() _NOEXCEPT;
95 virtual const char* what() const _NOEXCEPT;
98 class _LIBCPP_EXCEPTION_ABI bad_exception
102 _LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {}
103 virtual ~bad_exception() _NOEXCEPT;
104 virtual const char* what() const _NOEXCEPT;
107 typedef void (*unexpected_handler)();
108 _LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;
109 _LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT;
110 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected();
112 typedef void (*terminate_handler)();
113 _LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT;
114 _LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT;
115 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT;
117 _LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;
119 class _LIBCPP_TYPE_VIS exception_ptr;
121 _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
122 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
124 class _LIBCPP_TYPE_VIS exception_ptr
128 _LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {}
129 _LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}
130 exception_ptr(const exception_ptr&) _NOEXCEPT;
131 exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
132 ~exception_ptr() _NOEXCEPT;
134 _LIBCPP_INLINE_VISIBILITY
136 operator bool() const _NOEXCEPT {return __ptr_ != nullptr;}
138 friend _LIBCPP_INLINE_VISIBILITY
139 bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
140 {return __x.__ptr_ == __y.__ptr_;}
141 friend _LIBCPP_INLINE_VISIBILITY
142 bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
143 {return !(__x == __y);}
145 friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
146 friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
151 make_exception_ptr(_Ep __e) _NOEXCEPT
153 #ifndef _LIBCPP_NO_EXCEPTIONS
160 return current_exception();
162 #endif // _LIBCPP_NO_EXCEPTIONS
167 class _LIBCPP_EXCEPTION_ABI nested_exception
169 exception_ptr __ptr_;
171 nested_exception() _NOEXCEPT;
172 // nested_exception(const nested_exception&) noexcept = default;
173 // nested_exception& operator=(const nested_exception&) noexcept = default;
174 virtual ~nested_exception() _NOEXCEPT;
177 _LIBCPP_NORETURN void rethrow_nested() const;
178 _LIBCPP_INLINE_VISIBILITY exception_ptr nested_ptr() const _NOEXCEPT {return __ptr_;}
184 public nested_exception
186 _LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {}
192 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
193 throw_with_nested(_Tp&& __t, typename enable_if<
194 is_class<typename remove_reference<_Tp>::type>::value &&
195 !is_base_of<nested_exception, typename remove_reference<_Tp>::type>::value
197 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
198 throw_with_nested (_Tp& __t, typename enable_if<
199 is_class<_Tp>::value && !is_base_of<nested_exception, _Tp>::value
201 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
203 #ifndef _LIBCPP_NO_EXCEPTIONS
204 throw __nested<typename remove_reference<_Tp>::type>(_VSTD::forward<_Tp>(__t));
211 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
212 throw_with_nested(_Tp&& __t, typename enable_if<
213 !is_class<typename remove_reference<_Tp>::type>::value ||
214 is_base_of<nested_exception, typename remove_reference<_Tp>::type>::value
216 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
217 throw_with_nested (_Tp& __t, typename enable_if<
218 !is_class<_Tp>::value || is_base_of<nested_exception, _Tp>::value
220 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
222 #ifndef _LIBCPP_NO_EXCEPTIONS
223 throw _VSTD::forward<_Tp>(__t);
228 inline _LIBCPP_INLINE_VISIBILITY
230 rethrow_if_nested(const _Ep& __e, typename enable_if<
231 is_polymorphic<_Ep>::value
234 const nested_exception* __nep = dynamic_cast<const nested_exception*>(&__e);
236 __nep->rethrow_nested();
240 inline _LIBCPP_INLINE_VISIBILITY
242 rethrow_if_nested(const _Ep&, typename enable_if<
243 !is_polymorphic<_Ep>::value
250 #endif // _LIBCPP_EXCEPTION