30 #define _GLIBCXX_ANY 1
32 #pragma GCC system_header
34 #if __cplusplus >= 201703L
41 namespace std _GLIBCXX_VISIBILITY(default)
43 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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;
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>
105 _Manager_internal<_Tp>,
106 _Manager_external<_Tp>>;
108 template<
typename _Tp,
typename _VTp = decay_t<_Tp>>
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>>
128 _Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
129 _M_manager = &_Mgr::_S_manage;
132 template <
typename _Res,
typename _Tp,
typename... _Args>
138 template <
typename _Tp,
typename... _Args>
139 using __any_constructible_t
142 template<
typename _VTp,
typename... _Args>
150 constexpr
any() noexcept : _M_manager(
nullptr) { }
156 _M_manager =
nullptr;
161 __other._M_manager(_Op_clone, &__other, &__arg);
172 if (!__other.has_value())
173 _M_manager =
nullptr;
178 __other._M_manager(_Op_xfer, &__other, &__arg);
183 template <
typename _Tp,
typename _VTp = _Decay_if_not_any<_Tp>,
184 typename _Mgr = _Manager<_VTp>,
185 enable_if_t<is_copy_constructible<_VTp>::value
186 && !__is_in_place_type<_VTp>::value,
bool> = true>
188 : _M_manager(&_Mgr::_S_manage)
190 _Mgr::_S_create(_M_storage, std::forward<_Tp>(__value));
194 template <
typename _Tp,
typename... _Args,
typename _VTp =
decay_t<_Tp>,
195 typename _Mgr = _Manager<_VTp>,
196 __any_constructible_t<_VTp, _Args&&...> =
false>
198 any(in_place_type_t<_Tp>, _Args&&... __args)
199 : _M_manager(&_Mgr::_S_manage)
201 _Mgr::_S_create(_M_storage, std::forward<_Args>(__args)...);
206 template <
typename _Tp,
typename _Up,
typename... _Args,
207 typename _VTp =
decay_t<_Tp>,
typename _Mgr = _Manager<_VTp>,
208 __any_constructible_t<_VTp, initializer_list<_Up>&,
212 : _M_manager(&_Mgr::_S_manage)
214 _Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
238 if (!__rhs.has_value())
240 else if (
this != &__rhs)
245 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
251 template<
typename _Tp>
255 *
this =
any(std::forward<_Tp>(__rhs));
260 template <
typename _Tp,
typename... _Args>
261 __emplace_t<decay_t<_Tp>, _Args...>
265 __do_emplace<_VTp>(std::forward<_Args>(__args)...);
267 this->_M_manager(any::_Op_access,
this, &__arg);
268 return *
static_cast<_VTp*
>(__arg._M_obj);
273 template <
typename _Tp,
typename _Up,
typename... _Args>
278 __do_emplace<_VTp, _Up>(__il, std::forward<_Args>(__args)...);
280 this->_M_manager(any::_Op_access,
this, &__arg);
281 return *
static_cast<_VTp*
>(__arg._M_obj);
291 _M_manager(_Op_destroy,
this,
nullptr);
292 _M_manager =
nullptr;
309 __arg._M_any = &__tmp;
310 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
311 __arg._M_any = &__rhs;
312 _M_manager(_Op_xfer,
this, &__arg);
314 __tmp._M_manager(_Op_xfer, &__tmp, &__arg);
321 __arg._M_any = __empty;
322 __full->_M_manager(_Op_xfer, __full, &__arg);
329 bool has_value() const noexcept {
return _M_manager !=
nullptr; }
338 _M_manager(_Op_get_type_info,
this, &__arg);
339 return *__arg._M_typeinfo;
343 template<
typename _Tp>
344 static constexpr
bool __is_valid_cast()
349 _Op_access, _Op_get_type_info, _Op_clone, _Op_destroy, _Op_xfer
359 void (*_M_manager)(_Op,
const any*, _Arg*);
362 template<
typename _Tp>
363 friend void* __any_caster(
const any* __any);
366 template<
typename _Tp>
367 struct _Manager_internal
370 _S_manage(_Op __which,
const any* __anyp, _Arg* __arg);
372 template<
typename _Up>
374 _S_create(_Storage& __storage, _Up&& __value)
376 void* __addr = &__storage._M_buffer;
377 ::new (__addr) _Tp(std::
forward<_Up>(__value));
380 template<typename... _Args>
382 _S_create(_Storage& __storage, _Args&&... __args)
384 void* __addr = &__storage._M_buffer;
385 ::new (__addr) _Tp(std::
forward<_Args>(__args)...);
390 template<typename _Tp>
391 struct _Manager_external
394 _S_manage(_Op __which,
const any* __anyp, _Arg* __arg);
396 template<
typename _Up>
398 _S_create(_Storage& __storage, _Up&& __value)
400 __storage._M_ptr =
new _Tp(std::forward<_Up>(__value));
402 template<
typename... _Args>
404 _S_create(_Storage& __storage, _Args&&... __args)
406 __storage._M_ptr =
new _Tp(std::forward<_Args>(__args)...);
412 inline void swap(
any& __x,
any& __y) noexcept { __x.swap(__y); }
415 template <
typename _Tp,
typename... _Args>
418 return any(in_place_type<_Tp>, std::forward<_Args>(__args)...);
422 template <
typename _Tp,
typename _Up,
typename... _Args>
425 return any(in_place_type<_Tp>, __il, std::forward<_Args>(__args)...);
438 template<
typename _ValueType>
441 using _Up = __remove_cvref_t<_ValueType>;
442 static_assert(any::__is_valid_cast<_ValueType>(),
443 "Template argument must be a reference or CopyConstructible type");
444 static_assert(is_constructible_v<_ValueType, const _Up&>,
445 "Template argument must be constructible from a const value.");
448 return static_cast<_ValueType
>(*__p);
449 __throw_bad_any_cast();
464 template<
typename _ValueType>
467 using _Up = __remove_cvref_t<_ValueType>;
468 static_assert(any::__is_valid_cast<_ValueType>(),
469 "Template argument must be a reference or CopyConstructible type");
470 static_assert(is_constructible_v<_ValueType, _Up&>,
471 "Template argument must be constructible from an lvalue.");
474 return static_cast<_ValueType
>(*__p);
475 __throw_bad_any_cast();
478 template<
typename _ValueType>
481 using _Up = __remove_cvref_t<_ValueType>;
482 static_assert(any::__is_valid_cast<_ValueType>(),
483 "Template argument must be a reference or CopyConstructible type");
484 static_assert(is_constructible_v<_ValueType, _Up>,
485 "Template argument must be constructible from an rvalue.");
488 return static_cast<_ValueType
>(
std::move(*__p));
489 __throw_bad_any_cast();
494 template<
typename _Tp>
495 void* __any_caster(
const any* __any)
499 using _Up = remove_cv_t<_Tp>;
502 if constexpr (!is_same_v<decay_t<_Up>, _Up>)
505 else if constexpr (!is_copy_constructible_v<_Up>)
508 else if (__any->_M_manager == &
any::_Manager<_Up>::_S_manage
510 || __any->type() ==
typeid(_Tp)
515 __any->_M_manager(any::_Op_access, __any, &__arg);
533 template<
typename _ValueType>
536 if constexpr (is_object_v<_ValueType>)
538 return static_cast<_ValueType*
>(__any_caster<_ValueType>(__any));
542 template<
typename _ValueType>
545 if constexpr (is_object_v<_ValueType>)
547 return static_cast<_ValueType*
>(__any_caster<_ValueType>(__any));
552 template<
typename _Tp>
554 any::_Manager_internal<_Tp>::
555 _S_manage(_Op __which,
const any* __any, _Arg* __arg)
558 auto __ptr =
reinterpret_cast<const _Tp*
>(&__any->_M_storage._M_buffer);
562 __arg->_M_obj =
const_cast<_Tp*
>(__ptr);
564 case _Op_get_type_info:
566 __arg->_M_typeinfo = &
typeid(_Tp);
570 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp(*__ptr);
571 __arg->_M_any->_M_manager = __any->_M_manager;
577 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp
578 (std::
move(*const_cast<_Tp*>(__ptr)));
580 __arg->_M_any->_M_manager = __any->_M_manager;
581 const_cast<
any*>(__any)->_M_manager =
nullptr;
586 template<typename _Tp>
588 any::_Manager_external<_Tp>::
589 _S_manage(_Op __which, const
any* __any, _Arg* __arg)
592 auto __ptr =
static_cast<const _Tp*
>(__any->_M_storage._M_ptr);
596 __arg->_M_obj =
const_cast<_Tp*
>(__ptr);
598 case _Op_get_type_info:
600 __arg->_M_typeinfo = &
typeid(_Tp);
604 __arg->_M_any->_M_storage._M_ptr =
new _Tp(*__ptr);
605 __arg->_M_any->_M_manager = __any->_M_manager;
611 __arg->_M_any->_M_storage._M_ptr = __any->_M_storage._M_ptr;
612 __arg->_M_any->_M_manager = __any->_M_manager;
613 const_cast<any*
>(__any)->_M_manager =
nullptr;
620 namespace __detail::__variant
622 template<
typename>
struct _Never_valueless_alt;
627 struct _Never_valueless_alt<std::
any>
632 _GLIBCXX_END_NAMESPACE_VERSION
636 #endif // _GLIBCXX_ANY
virtual const char * what() const noexcept
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
_ValueType any_cast(const any &__any)
Access the contained object.
any make_any(_Args &&...__args)
Create an any holding a _Tp constructed from __args.
constexpr any() noexcept
Default constructor, creates an empty object.
any(any &&__other) noexcept
Move constructor, transfer the state from __other.
enable_if_t< is_copy_constructible< _Decay_if_not_any< _Tp > >::value, any & > operator=(_Tp &&__rhs)
Store a copy of __rhs as the contained object.
typename enable_if< _Cond, _Tp >::type enable_if_t
Alias template for enable_if.
bool has_value() const noexcept
Reports whether there is a contained object or not.
typename decay< _Tp >::type decay_t
Alias template for decay.
any(_Tp &&__value)
Construct with a copy of __value as the contained object.
any(in_place_type_t< _Tp >, _Args &&...__args)
Construct with an object created from __args as the contained object.
void reset() noexcept
If not empty, destroy the contained object.
__emplace_t< decay_t< _Tp >, _Args...> emplace(_Args &&...__args)
Emplace with an object created from __args as the contained object.
any & operator=(const any &__rhs)
Copy the state of another object.
void swap(any &__rhs) noexcept
Exchange state with another object.
constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept
Forward an lvalue.
Exception class thrown by a failed any_cast.
typename conditional< _Cond, _Iftrue, _Iffalse >::type conditional_t
Alias template for conditional.
A type-safe container of any type.
any & operator=(any &&__rhs) noexcept
Move assignment operator.
any(const any &__other)
Copy constructor, copies the state of __other.
~any()
Destructor, calls reset()
const type_info & type() const noexcept
The typeid of the contained object, or typeid(void) if empty.
Define a member typedef type only if a boolean constant is true.
any(in_place_type_t< _Tp >, initializer_list< _Up > __il, _Args &&...__args)
Construct with an object created from __il and __args as the contained object.
__emplace_t< decay_t< _Tp >, initializer_list< _Up > &, _Args &&...> emplace(initializer_list< _Up > __il, _Args &&...__args)
Emplace with an object created from __il and __args as the contained object.
Thrown during incorrect typecasting.If you attempt an invalid dynamic_cast expression, an instance of this class (or something derived from this class) is thrown.