30 #define _GLIBCXX_ANY 1
32 #pragma GCC system_header
34 #if __cplusplus >= 201703L
39 #include <type_traits>
41 namespace std _GLIBCXX_VISIBILITY(default)
43 _GLIBCXX_BEGIN_NAMESPACE_VERSION
54 class bad_any_cast :
public bad_cast
57 virtual const char* what() const noexcept {
return "bad any_cast"; }
60 [[gnu::noreturn]]
inline void __throw_bad_any_cast()
69 #define __cpp_lib_any 201606L
82 constexpr _Storage() : _M_ptr{
nullptr} {}
85 _Storage(
const _Storage&) =
delete;
86 _Storage& operator=(
const _Storage&) =
delete;
89 aligned_storage<
sizeof(_M_ptr),
alignof(
void*)>::type _M_buffer;
92 template<
typename _Tp,
typename _Safe = is_nothrow_move_constructible<_Tp>,
93 bool _Fits = (sizeof(_Tp) <= sizeof(_Storage))
94 && (alignof(_Tp) <= alignof(_Storage))>
95 using _Internal = std::
integral_constant<
bool, _Safe::value && _Fits>;
97 template<
typename _Tp>
98 struct _Manager_internal;
100 template<
typename _Tp>
101 struct _Manager_external;
103 template<
typename _Tp>
104 using _Manager = conditional_t<_Internal<_Tp>::value,
105 _Manager_internal<_Tp>,
106 _Manager_external<_Tp>>;
108 template<
typename _Tp,
typename _Decayed = decay_t<_Tp>>
109 using _Decay = enable_if_t<!is_same<_Decayed, any>::value, _Decayed>;
112 template <
typename _Tp,
typename... _Args,
113 typename _Mgr = _Manager<_Tp>>
114 void __do_emplace(_Args&&... __args)
117 _Mgr::_S_create(_M_storage, std::forward<_Args>(__args)...);
118 _M_manager = &_Mgr::_S_manage;
123 template <
typename _Tp,
typename _Up,
typename... _Args,
124 typename _Mgr = _Manager<_Tp>>
125 void __do_emplace(initializer_list<_Up> __il, _Args&&... __args)
128 _Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
129 _M_manager = &_Mgr::_S_manage;
136 constexpr any() noexcept : _M_manager(
nullptr) { }
139 any(
const any& __other)
141 if (!__other.has_value())
142 _M_manager =
nullptr;
147 __other._M_manager(_Op_clone, &__other, &__arg);
156 any(any&& __other) noexcept
158 if (!__other.has_value())
159 _M_manager =
nullptr;
164 __other._M_manager(_Op_xfer, &__other, &__arg);
168 template <
typename _Res,
typename _Tp,
typename... _Args>
169 using __any_constructible =
170 enable_if<__and_<is_copy_constructible<_Tp>,
171 is_constructible<_Tp, _Args...>>::value,
174 template <
typename _Tp,
typename... _Args>
175 using __any_constructible_t =
176 typename __any_constructible<bool, _Tp, _Args...>::type;
179 template <
typename _ValueType,
typename _Tp = _Decay<_ValueType>,
180 typename _Mgr = _Manager<_Tp>,
181 __any_constructible_t<_Tp, _ValueType&&> = true,
182 enable_if_t<!__is_in_place_type<_Tp>::value,
bool> = true>
183 any(_ValueType&& __value)
184 : _M_manager(&_Mgr::_S_manage)
186 _Mgr::_S_create(_M_storage, std::forward<_ValueType>(__value));
190 template <
typename _ValueType,
typename _Tp = _Decay<_ValueType>,
191 typename _Mgr = _Manager<_Tp>,
192 enable_if_t<__and_v<is_copy_constructible<_Tp>,
193 __not_<is_constructible<_Tp, _ValueType&&>>,
194 __not_<__is_in_place_type<_Tp>>>,
196 any(_ValueType&& __value)
197 : _M_manager(&_Mgr::_S_manage)
199 _Mgr::_S_create(_M_storage, __value);
203 template <
typename _ValueType,
typename... _Args,
204 typename _Tp = _Decay<_ValueType>,
205 typename _Mgr = _Manager<_Tp>,
206 __any_constructible_t<_Tp, _Args&&...> =
false>
208 any(in_place_type_t<_ValueType>, _Args&&... __args)
209 : _M_manager(&_Mgr::_S_manage)
211 _Mgr::_S_create(_M_storage, std::forward<_Args>(__args)...);
216 template <
typename _ValueType,
typename _Up,
typename... _Args,
217 typename _Tp = _Decay<_ValueType>,
218 typename _Mgr = _Manager<_Tp>,
219 __any_constructible_t<_Tp, initializer_list<_Up>,
222 any(in_place_type_t<_ValueType>,
223 initializer_list<_Up> __il, _Args&&... __args)
224 : _M_manager(&_Mgr::_S_manage)
226 _Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
235 any& operator=(
const any& __rhs)
246 any& operator=(any&& __rhs) noexcept
248 if (!__rhs.has_value())
250 else if (
this != &__rhs)
255 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
261 template<
typename _ValueType>
262 enable_if_t<is_copy_constructible<_Decay<_ValueType>>::value, any&>
263 operator=(_ValueType&& __rhs)
265 *
this = any(std::forward<_ValueType>(__rhs));
270 template <
typename _ValueType,
typename... _Args>
271 typename __any_constructible<_Decay<_ValueType>&,
272 _Decay<_ValueType>, _Args&&...>::type
273 emplace(_Args&&... __args)
275 __do_emplace<_Decay<_ValueType>>(std::forward<_Args>(__args)...);
277 this->_M_manager(any::_Op_access,
this, &__arg);
278 return *
static_cast<_Decay<_ValueType>*
>(__arg._M_obj);
283 template <
typename _ValueType,
typename _Up,
typename... _Args>
284 typename __any_constructible<_Decay<_ValueType>&,
286 initializer_list<_Up>,
288 emplace(initializer_list<_Up> __il, _Args&&... __args)
290 __do_emplace<_Decay<_ValueType>, _Up>(__il,
291 std::forward<_Args>(__args)...);
293 this->_M_manager(any::_Op_access,
this, &__arg);
294 return *
static_cast<_Decay<_ValueType>*
>(__arg._M_obj);
300 void reset() noexcept
304 _M_manager(_Op_destroy,
this,
nullptr);
305 _M_manager =
nullptr;
310 void swap(any& __rhs) noexcept
312 if (!has_value() && !__rhs.has_value())
315 if (has_value() && __rhs.has_value())
322 __arg._M_any = &__tmp;
323 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
324 __arg._M_any = &__rhs;
325 _M_manager(_Op_xfer,
this, &__arg);
327 __tmp._M_manager(_Op_xfer, &__tmp, &__arg);
331 any* __empty = !has_value() ? this : &__rhs;
332 any* __full = !has_value() ? &__rhs :
this;
334 __arg._M_any = __empty;
335 __full->_M_manager(_Op_xfer, __full, &__arg);
342 bool has_value() const noexcept {
return _M_manager !=
nullptr; }
346 const type_info& type() const noexcept
351 _M_manager(_Op_get_type_info,
this, &__arg);
352 return *__arg._M_typeinfo;
356 template<
typename _Tp>
357 static constexpr
bool __is_valid_cast()
358 {
return __or_<is_reference<_Tp>, is_copy_constructible<_Tp>>::value; }
362 _Op_access, _Op_get_type_info, _Op_clone, _Op_destroy, _Op_xfer
372 void (*_M_manager)(_Op,
const any*, _Arg*);
375 template<
typename _Tp>
376 friend void* __any_caster(
const any* __any);
379 template<
typename _Tp>
380 struct _Manager_internal
383 _S_manage(_Op __which,
const any* __anyp, _Arg* __arg);
385 template<
typename _Up>
387 _S_create(_Storage& __storage, _Up&& __value)
389 void* __addr = &__storage._M_buffer;
390 ::new (__addr) _Tp(std::forward<_Up>(__value));
393 template<
typename... _Args>
395 _S_create(_Storage& __storage, _Args&&... __args)
397 void* __addr = &__storage._M_buffer;
398 ::new (__addr) _Tp(std::forward<_Args>(__args)...);
403 template<
typename _Tp>
404 struct _Manager_external
407 _S_manage(_Op __which,
const any* __anyp, _Arg* __arg);
409 template<
typename _Up>
411 _S_create(_Storage& __storage, _Up&& __value)
413 __storage._M_ptr =
new _Tp(std::forward<_Up>(__value));
415 template<
typename... _Args>
417 _S_create(_Storage& __storage, _Args&&... __args)
419 __storage._M_ptr =
new _Tp(std::forward<_Args>(__args)...);
425 inline void swap(any& __x, any& __y) noexcept { __x.swap(__y); }
428 template <
typename _Tp,
typename... _Args>
429 any make_any(_Args&&... __args)
431 return any(in_place_type<_Tp>, std::forward<_Args>(__args)...);
435 template <
typename _Tp,
typename _Up,
typename... _Args>
436 any make_any(initializer_list<_Up> __il, _Args&&... __args)
438 return any(in_place_type<_Tp>, __il, std::forward<_Args>(__args)...);
451 template<
typename _ValueType>
452 inline _ValueType
any_cast(
const any& __any)
454 using _Up = __remove_cvref_t<_ValueType>;
455 static_assert(any::__is_valid_cast<_ValueType>(),
456 "Template argument must be a reference or CopyConstructible type");
457 static_assert(is_constructible_v<_ValueType, const _Up&>,
458 "Template argument must be constructible from a const value.");
459 auto __p = any_cast<_Up>(&__any);
461 return static_cast<_ValueType>(*__p);
462 __throw_bad_any_cast();
477 template<
typename _ValueType>
478 inline _ValueType
any_cast(any& __any)
480 using _Up = __remove_cvref_t<_ValueType>;
481 static_assert(any::__is_valid_cast<_ValueType>(),
482 "Template argument must be a reference or CopyConstructible type");
483 static_assert(is_constructible_v<_ValueType, _Up&>,
484 "Template argument must be constructible from an lvalue.");
485 auto __p = any_cast<_Up>(&__any);
487 return static_cast<_ValueType>(*__p);
488 __throw_bad_any_cast();
491 template<
typename _ValueType>
492 inline _ValueType
any_cast(any&& __any)
494 using _Up = __remove_cvref_t<_ValueType>;
495 static_assert(any::__is_valid_cast<_ValueType>(),
496 "Template argument must be a reference or CopyConstructible type");
497 static_assert(is_constructible_v<_ValueType, _Up>,
498 "Template argument must be constructible from an rvalue.");
499 auto __p = any_cast<_Up>(&__any);
501 return static_cast<_ValueType>(
std::move(*__p));
502 __throw_bad_any_cast();
507 template<
typename _Tp>
508 void* __any_caster(
const any* __any)
512 using _Up = remove_cv_t<_Tp>;
515 if constexpr (!is_same_v<decay_t<_Up>, _Up>)
518 else if constexpr (!is_copy_constructible_v<_Up>)
521 else if (__any->_M_manager == &any::_Manager<_Up>::_S_manage
523 || __any->type() ==
typeid(_Tp)
528 __any->_M_manager(any::_Op_access, __any, &__arg);
546 template<
typename _ValueType>
547 inline const _ValueType*
any_cast(
const any* __any) noexcept
549 if constexpr (is_object_v<_ValueType>)
551 return static_cast<_ValueType*>(__any_caster<_ValueType>(__any));
555 template<
typename _ValueType>
556 inline _ValueType*
any_cast(any* __any) noexcept
558 if constexpr (is_object_v<_ValueType>)
560 return static_cast<_ValueType*>(__any_caster<_ValueType>(__any));
565 template<
typename _Tp>
567 any::_Manager_internal<_Tp>::
568 _S_manage(_Op __which,
const any* __any, _Arg* __arg)
571 auto __ptr = reinterpret_cast<const _Tp*>(&__any->_M_storage._M_buffer);
575 __arg->_M_obj = const_cast<_Tp*>(__ptr);
577 case _Op_get_type_info:
579 __arg->_M_typeinfo = &
typeid(_Tp);
583 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp(*__ptr);
584 __arg->_M_any->_M_manager = __any->_M_manager;
590 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp
591 (
std::
move(*const_cast<_Tp*>(__ptr)));
593 __arg->_M_any->_M_manager = __any->_M_manager;
594 const_cast<any*>(__any)->_M_manager =
nullptr;
599 template<typename _Tp>
601 any::_Manager_external<_Tp>::
602 _S_manage(_Op __which, const any* __any, _Arg* __arg)
605 auto __ptr = static_cast<const _Tp*>(__any->_M_storage._M_ptr);
609 __arg->_M_obj = const_cast<_Tp*>(__ptr);
611 case _Op_get_type_info:
613 __arg->_M_typeinfo = &
typeid(_Tp);
617 __arg->_M_any->_M_storage._M_ptr =
new _Tp(*__ptr);
618 __arg->_M_any->_M_manager = __any->_M_manager;
624 __arg->_M_any->_M_storage._M_ptr = __any->_M_storage._M_ptr;
625 __arg->_M_any->_M_manager = __any->_M_manager;
626 const_cast<any*>(__any)->_M_manager =
nullptr;
633 namespace __detail::__variant
635 template<
typename>
struct _Never_valueless_alt;
640 struct _Never_valueless_alt<
std::any>
645 _GLIBCXX_END_NAMESPACE_VERSION
649 #endif // _GLIBCXX_ANY