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 _VTp = decay_t<_Tp>>
109 using _Decay_if_not_any = enable_if_t<!is_same_v<_VTp, any>, _VTp>;
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;
132 template <
typename _Res,
typename _Tp,
typename... _Args>
133 using __any_constructible
134 = enable_if<__and_<is_copy_constructible<_Tp>,
135 is_constructible<_Tp, _Args...>>::value,
138 template <
typename _Tp,
typename... _Args>
139 using __any_constructible_t
140 =
typename __any_constructible<bool, _Tp, _Args...>::type;
142 template<
typename _VTp,
typename... _Args>
144 =
typename __any_constructible<_VTp&, _VTp, _Args...>::type;
150 constexpr any() noexcept : _M_manager(
nullptr) { }
153 any(
const any& __other)
155 if (!__other.has_value())
156 _M_manager =
nullptr;
161 __other._M_manager(_Op_clone, &__other, &__arg);
170 any(any&& __other) noexcept
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>&,
211 any(in_place_type_t<_Tp>, initializer_list<_Up> __il, _Args&&... __args)
212 : _M_manager(&_Mgr::_S_manage)
214 _Mgr::_S_create(_M_storage, __il, std::forward<_Args>(__args)...);
224 operator=(
const any& __rhs)
236 operator=(any&& __rhs) noexcept
238 if (!__rhs.has_value())
240 else if (
this != &__rhs)
245 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
251 template<
typename _Tp>
252 enable_if_t<is_copy_constructible<_Decay_if_not_any<_Tp>>::value, any&>
253 operator=(_Tp&& __rhs)
255 *
this = any(std::forward<_Tp>(__rhs));
260 template <
typename _Tp,
typename... _Args>
261 __emplace_t<decay_t<_Tp>, _Args...>
262 emplace(_Args&&... __args)
264 using _VTp = decay_t<_Tp>;
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>
274 __emplace_t<decay_t<_Tp>, initializer_list<_Up>&, _Args&&...>
275 emplace(initializer_list<_Up> __il, _Args&&... __args)
277 using _VTp = decay_t<_Tp>;
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);
287 void reset() noexcept
291 _M_manager(_Op_destroy,
this,
nullptr);
292 _M_manager =
nullptr;
297 void swap(any& __rhs) noexcept
299 if (!has_value() && !__rhs.has_value())
302 if (has_value() && __rhs.has_value())
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);
318 any* __empty = !has_value() ? this : &__rhs;
319 any* __full = !has_value() ? &__rhs :
this;
321 __arg._M_any = __empty;
322 __full->_M_manager(_Op_xfer, __full, &__arg);
329 bool has_value() const noexcept {
return _M_manager !=
nullptr; }
333 const type_info& type() const noexcept
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()
345 {
return __or_<is_reference<_Tp>, is_copy_constructible<_Tp>>::value; }
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>
417 enable_if_t<is_constructible_v<any, in_place_type_t<_Tp>, _Args...>, any>
418 make_any(_Args&&... __args)
420 return any(in_place_type<_Tp>, std::forward<_Args>(__args)...);
424 template <
typename _Tp,
typename _Up,
typename... _Args>
426 enable_if_t<is_constructible_v<any, in_place_type_t<_Tp>,
427 initializer_list<_Up>&, _Args...>, any>
428 make_any(initializer_list<_Up> __il, _Args&&... __args)
430 return any(in_place_type<_Tp>, __il, std::forward<_Args>(__args)...);
443 template<
typename _ValueType>
444 inline _ValueType
any_cast(
const any& __any)
446 using _Up = __remove_cvref_t<_ValueType>;
447 static_assert(any::__is_valid_cast<_ValueType>(),
448 "Template argument must be a reference or CopyConstructible type");
449 static_assert(is_constructible_v<_ValueType, const _Up&>,
450 "Template argument must be constructible from a const value.");
451 auto __p = any_cast<_Up>(&__any);
453 return static_cast<_ValueType
>(*__p);
454 __throw_bad_any_cast();
469 template<
typename _ValueType>
470 inline _ValueType
any_cast(any& __any)
472 using _Up = __remove_cvref_t<_ValueType>;
473 static_assert(any::__is_valid_cast<_ValueType>(),
474 "Template argument must be a reference or CopyConstructible type");
475 static_assert(is_constructible_v<_ValueType, _Up&>,
476 "Template argument must be constructible from an lvalue.");
477 auto __p = any_cast<_Up>(&__any);
479 return static_cast<_ValueType
>(*__p);
480 __throw_bad_any_cast();
483 template<
typename _ValueType>
484 inline _ValueType
any_cast(any&& __any)
486 using _Up = __remove_cvref_t<_ValueType>;
487 static_assert(any::__is_valid_cast<_ValueType>(),
488 "Template argument must be a reference or CopyConstructible type");
489 static_assert(is_constructible_v<_ValueType, _Up>,
490 "Template argument must be constructible from an rvalue.");
491 auto __p = any_cast<_Up>(&__any);
493 return static_cast<_ValueType
>(
std::move(*__p));
494 __throw_bad_any_cast();
499 template<
typename _Tp>
500 void* __any_caster(
const any* __any)
504 using _Up = remove_cv_t<_Tp>;
507 if constexpr (!is_same_v<decay_t<_Up>, _Up>)
510 else if constexpr (!is_copy_constructible_v<_Up>)
513 else if (__any->_M_manager == &any::_Manager<_Up>::_S_manage
515 || __any->type() ==
typeid(_Tp)
520 __any->_M_manager(any::_Op_access, __any, &__arg);
538 template<
typename _ValueType>
539 inline const _ValueType*
any_cast(
const any* __any) noexcept
541 if constexpr (is_object_v<_ValueType>)
543 return static_cast<_ValueType*
>(__any_caster<_ValueType>(__any));
547 template<
typename _ValueType>
548 inline _ValueType*
any_cast(any* __any) noexcept
550 if constexpr (is_object_v<_ValueType>)
552 return static_cast<_ValueType*
>(__any_caster<_ValueType>(__any));
557 template<
typename _Tp>
559 any::_Manager_internal<_Tp>::
560 _S_manage(_Op __which,
const any* __any, _Arg* __arg)
563 auto __ptr =
reinterpret_cast<const _Tp*
>(&__any->_M_storage._M_buffer);
567 __arg->_M_obj =
const_cast<_Tp*
>(__ptr);
569 case _Op_get_type_info:
571 __arg->_M_typeinfo = &
typeid(_Tp);
575 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp(*__ptr);
576 __arg->_M_any->_M_manager = __any->_M_manager;
582 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp
583 (
std::
move(*const_cast<_Tp*>(__ptr)));
585 __arg->_M_any->_M_manager = __any->_M_manager;
586 const_cast<any*>(__any)->_M_manager =
nullptr;
591 template<typename _Tp>
593 any::_Manager_external<_Tp>::
594 _S_manage(_Op __which, const any* __any, _Arg* __arg)
597 auto __ptr =
static_cast<const _Tp*
>(__any->_M_storage._M_ptr);
601 __arg->_M_obj =
const_cast<_Tp*
>(__ptr);
603 case _Op_get_type_info:
605 __arg->_M_typeinfo = &
typeid(_Tp);
609 __arg->_M_any->_M_storage._M_ptr =
new _Tp(*__ptr);
610 __arg->_M_any->_M_manager = __any->_M_manager;
616 __arg->_M_any->_M_storage._M_ptr = __any->_M_storage._M_ptr;
617 __arg->_M_any->_M_manager = __any->_M_manager;
618 const_cast<any*
>(__any)->_M_manager =
nullptr;
625 namespace __detail::__variant
627 template<
typename>
struct _Never_valueless_alt;
632 struct _Never_valueless_alt<
std::any>
637 _GLIBCXX_END_NAMESPACE_VERSION
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.
ISO C++ entities toplevel namespace is std.