32#pragma GCC system_header
34#if __cplusplus >= 201703L
42namespace std _GLIBCXX_VISIBILITY(default)
44_GLIBCXX_BEGIN_NAMESPACE_VERSION
58 virtual const char*
what() const noexcept {
return "bad any_cast"; }
61 [[gnu::noreturn]]
inline void __throw_bad_any_cast()
70#define __cpp_lib_any 201606L
85 constexpr _Storage() : _M_ptr{
nullptr} {}
88 _Storage(
const _Storage&) =
delete;
89 _Storage&
operator=(
const _Storage&) =
delete;
95 template<
typename _Tp,
typename _Safe = is_nothrow_move_constructible<_Tp>,
96 bool _Fits = (sizeof(_Tp) <= sizeof(_Storage))
97 && (alignof(_Tp) <= alignof(_Storage))>
98 using _Internal = std::
integral_constant<
bool, _Safe::value && _Fits>;
100 template<
typename _Tp>
101 struct _Manager_internal;
103 template<
typename _Tp>
104 struct _Manager_external;
106 template<
typename _Tp>
107 using _Manager = __conditional_t<_Internal<_Tp>::value,
108 _Manager_internal<_Tp>,
109 _Manager_external<_Tp>>;
111 template<
typename _Tp,
typename _VTp = decay_t<_Tp>>
115 template <
typename _Tp,
typename... _Args,
116 typename _Mgr = _Manager<_Tp>>
117 void __do_emplace(_Args&&... __args)
120 _Mgr::_S_create(_M_storage, std::forward<_Args>(__args)...);
121 _M_manager = &_Mgr::_S_manage;
126 template <
typename _Tp,
typename _Up,
typename... _Args,
127 typename _Mgr = _Manager<_Tp>>
131 _Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
132 _M_manager = &_Mgr::_S_manage;
135 template <
typename _Res,
typename _Tp,
typename... _Args>
141 template <
typename _Tp,
typename... _Args>
142 using __any_constructible_t
145 template<
typename _VTp,
typename... _Args>
153 constexpr any() noexcept : _M_manager(
nullptr) { }
159 _M_manager =
nullptr;
164 __other._M_manager(_Op_clone, &__other, &__arg);
175 if (!__other.has_value())
176 _M_manager =
nullptr;
181 __other._M_manager(_Op_xfer, &__other, &__arg);
186 template <
typename _Tp,
typename _VTp = _Decay_if_not_any<_Tp>,
187 typename _Mgr = _Manager<_VTp>,
188 enable_if_t<is_copy_constructible_v<_VTp>
189 && !__is_in_place_type_v<_VTp>,
bool> = true>
191 : _M_manager(&_Mgr::_S_manage)
193 _Mgr::_S_create(_M_storage, std::forward<_Tp>(__value));
197 template <
typename _Tp,
typename... _Args,
typename _VTp =
decay_t<_Tp>,
198 typename _Mgr = _Manager<_VTp>,
199 __any_constructible_t<_VTp, _Args&&...> =
false>
201 any(in_place_type_t<_Tp>, _Args&&... __args)
202 : _M_manager(&_Mgr::_S_manage)
204 _Mgr::_S_create(_M_storage, std::forward<_Args>(__args)...);
209 template <
typename _Tp,
typename _Up,
typename... _Args,
210 typename _VTp =
decay_t<_Tp>,
typename _Mgr = _Manager<_VTp>,
211 __any_constructible_t<_VTp, initializer_list<_Up>&,
215 : _M_manager(&_Mgr::_S_manage)
217 _Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
241 if (!__rhs.has_value())
243 else if (
this != &__rhs)
248 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
254 template<
typename _Tp>
258 *
this =
any(std::forward<_Tp>(__rhs));
263 template <
typename _Tp,
typename... _Args>
264 __emplace_t<decay_t<_Tp>, _Args...>
268 __do_emplace<_VTp>(std::forward<_Args>(__args)...);
269 return *any::_Manager<_VTp>::_S_access(_M_storage);
274 template <
typename _Tp,
typename _Up,
typename... _Args>
279 __do_emplace<_VTp, _Up>(__il, std::forward<_Args>(__args)...);
280 return *any::_Manager<_VTp>::_S_access(_M_storage);
290 _M_manager(_Op_destroy,
this,
nullptr);
291 _M_manager =
nullptr;
308 __arg._M_any = &__tmp;
309 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
310 __arg._M_any = &__rhs;
311 _M_manager(_Op_xfer,
this, &__arg);
313 __tmp._M_manager(_Op_xfer, &__tmp, &__arg);
320 __arg._M_any = __empty;
321 __full->_M_manager(_Op_xfer, __full, &__arg);
328 bool has_value() const noexcept {
return _M_manager !=
nullptr; }
337 _M_manager(_Op_get_type_info,
this, &__arg);
338 return *__arg._M_typeinfo;
343 template<
typename _Tp>
344 static constexpr bool __is_valid_cast()
350 _Op_access, _Op_get_type_info, _Op_clone, _Op_destroy, _Op_xfer
360 void (*_M_manager)(_Op,
const any*, _Arg*);
364 template<
typename _Tp>
365 friend void* __any_caster(
const any* __any);
369 template<
typename _Tp>
370 struct _Manager_internal
373 _S_manage(_Op __which,
const any* __anyp, _Arg* __arg);
375 template<
typename _Up>
377 _S_create(_Storage& __storage, _Up&& __value)
379 void* __addr = &__storage._M_buffer;
380 ::new (__addr) _Tp(std::forward<_Up>(__value));
383 template<
typename... _Args>
385 _S_create(_Storage& __storage, _Args&&... __args)
387 void* __addr = &__storage._M_buffer;
388 ::new (__addr) _Tp(std::forward<_Args>(__args)...);
392 _S_access(
const _Storage& __storage)
395 const void* __addr = &__storage._M_buffer;
396 return static_cast<_Tp*
>(
const_cast<void*
>(__addr));
401 template<
typename _Tp>
402 struct _Manager_external
405 _S_manage(_Op __which,
const any* __anyp, _Arg* __arg);
407 template<
typename _Up>
409 _S_create(_Storage& __storage, _Up&& __value)
411 __storage._M_ptr =
new _Tp(std::forward<_Up>(__value));
413 template<
typename... _Args>
415 _S_create(_Storage& __storage, _Args&&... __args)
417 __storage._M_ptr =
new _Tp(std::forward<_Args>(__args)...);
420 _S_access(
const _Storage& __storage)
423 return static_cast<_Tp*
>(__storage._M_ptr);
429 inline void swap(
any& __x,
any& __y)
noexcept { __x.swap(__y); }
432 template <
typename _Tp,
typename... _Args>
434 enable_if_t<is_constructible_v<any, in_place_type_t<_Tp>, _Args...>, any>
437 return any(in_place_type<_Tp>, std::forward<_Args>(__args)...);
441 template <
typename _Tp,
typename _Up,
typename... _Args>
443 enable_if_t<is_constructible_v<any, in_place_type_t<_Tp>,
444 initializer_list<_Up>&, _Args...>, any>
447 return any(in_place_type<_Tp>, __il, std::forward<_Args>(__args)...);
460 template<
typename _ValueType>
463 using _Up = __remove_cvref_t<_ValueType>;
464 static_assert(any::__is_valid_cast<_ValueType>(),
465 "Template argument must be a reference or CopyConstructible type");
466 static_assert(is_constructible_v<_ValueType, const _Up&>,
467 "Template argument must be constructible from a const value.");
468 auto __p = any_cast<_Up>(&__any);
470 return static_cast<_ValueType
>(*__p);
471 __throw_bad_any_cast();
486 template<
typename _ValueType>
489 using _Up = __remove_cvref_t<_ValueType>;
490 static_assert(any::__is_valid_cast<_ValueType>(),
491 "Template argument must be a reference or CopyConstructible type");
492 static_assert(is_constructible_v<_ValueType, _Up&>,
493 "Template argument must be constructible from an lvalue.");
494 auto __p = any_cast<_Up>(&__any);
496 return static_cast<_ValueType
>(*__p);
497 __throw_bad_any_cast();
500 template<
typename _ValueType>
503 using _Up = __remove_cvref_t<_ValueType>;
504 static_assert(any::__is_valid_cast<_ValueType>(),
505 "Template argument must be a reference or CopyConstructible type");
506 static_assert(is_constructible_v<_ValueType, _Up>,
507 "Template argument must be constructible from an rvalue.");
508 auto __p = any_cast<_Up>(&__any);
510 return static_cast<_ValueType
>(
std::move(*__p));
511 __throw_bad_any_cast();
516 template<
typename _Tp>
517 void* __any_caster(
const any* __any)
521 using _Up = remove_cv_t<_Tp>;
524 if constexpr (!is_same_v<decay_t<_Up>, _Up>)
527 else if constexpr (!is_copy_constructible_v<_Up>)
530 else if (__any->_M_manager == &any::_Manager<_Up>::_S_manage
532 || __any->type() ==
typeid(_Tp)
536 return any::_Manager<_Up>::_S_access(__any->_M_storage);
553 template<
typename _ValueType>
556 if constexpr (is_object_v<_ValueType>)
558 return static_cast<_ValueType*
>(__any_caster<_ValueType>(__any));
562 template<
typename _ValueType>
565 if constexpr (is_object_v<_ValueType>)
567 return static_cast<_ValueType*
>(__any_caster<_ValueType>(__any));
572 template<
typename _Tp>
574 any::_Manager_internal<_Tp>::
575 _S_manage(_Op __which,
const any* __any, _Arg* __arg)
578 auto __ptr =
reinterpret_cast<const _Tp*
>(&__any->_M_storage._M_buffer);
582 __arg->_M_obj =
const_cast<_Tp*
>(__ptr);
584 case _Op_get_type_info:
586 __arg->_M_typeinfo = &
typeid(_Tp);
590 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp(*__ptr);
591 __arg->_M_any->_M_manager = __any->_M_manager;
597 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp
598 (
std::
move(*const_cast<_Tp*>(__ptr)));
600 __arg->_M_any->_M_manager = __any->_M_manager;
601 const_cast<any*>(__any)->_M_manager =
nullptr;
606 template<typename _Tp>
608 any::_Manager_external<_Tp>::
609 _S_manage(_Op __which, const any* __any, _Arg* __arg)
612 auto __ptr =
static_cast<const _Tp*
>(__any->_M_storage._M_ptr);
616 __arg->_M_obj =
const_cast<_Tp*
>(__ptr);
618 case _Op_get_type_info:
620 __arg->_M_typeinfo = &
typeid(_Tp);
624 __arg->_M_any->_M_storage._M_ptr =
new _Tp(*__ptr);
625 __arg->_M_any->_M_manager = __any->_M_manager;
631 __arg->_M_any->_M_storage._M_ptr = __any->_M_storage._M_ptr;
632 __arg->_M_any->_M_manager = __any->_M_manager;
633 const_cast<any*
>(__any)->_M_manager =
nullptr;
640 namespace __detail::__variant
642 template<
typename>
struct _Never_valueless_alt;
647 struct _Never_valueless_alt<
std::any>
652_GLIBCXX_END_NAMESPACE_VERSION
typename decay< _Tp >::type decay_t
Alias template for decay.
typename enable_if< _Cond, _Tp >::type enable_if_t
Alias template for enable_if.
enable_if_t< is_constructible_v< any, in_place_type_t< _Tp >, _Args... >, any > make_any(_Args &&... __args)
Create an any holding a _Tp constructed from __args....
_ValueType any_cast(const any &__any)
Access the contained object.
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
void swap(any &__x, any &__y) noexcept
Exchange the states of two any objects.
ISO C++ entities toplevel namespace is std.
Thrown during incorrect typecasting.
Exception class thrown by a failed any_cast.
virtual const char * what() const noexcept
A type-safe container of any type.
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.
const type_info & type() const noexcept
The typeid of the contained object, or typeid(void) if empty.
__emplace_t< decay_t< _Tp >, _Args... > emplace(_Args &&... __args)
Emplace with an object created from __args as the contained object.
any(_Tp &&__value)
Construct with a copy of __value as the contained object.
any & operator=(any &&__rhs) noexcept
Move assignment operator.
any(const any &__other)
Copy constructor, copies the state of __other.
any(any &&__other) noexcept
Move constructor, transfer the state from __other.
__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.
~any()
Destructor, calls reset()
constexpr any() noexcept
Default constructor, creates an empty object.
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.
void reset() noexcept
If not empty, destroy the contained object.
any(in_place_type_t< _Tp >, _Args &&... __args)
Construct with an object created from __args as the contained object.
void swap(any &__rhs) noexcept
Exchange state with another object.
bool has_value() const noexcept
Reports whether there is a contained object or not.
any & operator=(const any &__rhs)
Copy the state of another object.
Define a member typedef type only if a boolean constant is true.