29 #ifndef _GLIBCXX_EXPERIMENTAL_ANY 30 #define _GLIBCXX_EXPERIMENTAL_ANY 1 32 #pragma GCC system_header 34 #if __cplusplus >= 201402L 42 namespace std _GLIBCXX_VISIBILITY(default)
44 namespace experimental
46 inline namespace fundamentals_v1
48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
60 #define __cpp_lib_experimental_any 201411 69 virtual const char*
what() const noexcept {
return "bad any_cast"; }
72 [[gnu::noreturn]]
inline void __throw_bad_any_cast()
96 _Storage(
const _Storage&) =
delete;
97 _Storage& operator=(
const _Storage&) =
delete;
100 aligned_storage<sizeof(_M_ptr), alignof(void*)>::type _M_buffer;
103 template<
typename _Tp,
typename _Safe = is_nothrow_move_constructible<_Tp>,
104 bool _Fits = (sizeof(_Tp) <= sizeof(_Storage))
105 && (alignof(_Tp) <= alignof(_Storage))>
106 using _Internal = std::
integral_constant<
bool, _Safe::value && _Fits>;
108 template<
typename _Tp>
109 struct _Manager_internal;
111 template<
typename _Tp>
112 struct _Manager_external;
114 template<
typename _Tp>
115 using _Manager = conditional_t<_Internal<_Tp>::value,
116 _Manager_internal<_Tp>,
117 _Manager_external<_Tp>>;
119 template<
typename _Tp,
typename _Decayed = decay_t<_Tp>>
120 using _Decay = enable_if_t<!is_same<_Decayed, any>::value, _Decayed>;
126 any() noexcept : _M_manager(
nullptr) { }
132 _M_manager =
nullptr;
137 __other._M_manager(_Op_clone, &__other, &__arg);
149 _M_manager =
nullptr;
154 __other._M_manager(_Op_xfer, &__other, &__arg);
159 template <
typename _ValueType,
typename _Tp = _Decay<_ValueType>,
160 typename _Mgr = _Manager<_Tp>,
161 typename enable_if<is_constructible<_Tp, _ValueType&&>::value,
164 : _M_manager(&_Mgr::_S_manage)
166 _Mgr::_S_create(_M_storage, std::forward<_ValueType>(__value));
167 static_assert(is_copy_constructible<_Tp>::value,
168 "The contained object must be CopyConstructible");
172 template <
typename _ValueType,
typename _Tp = _Decay<_ValueType>,
173 typename _Mgr = _Manager<_Tp>,
174 typename enable_if<!is_constructible<_Tp, _ValueType&&>::value,
177 : _M_manager(&_Mgr::_S_manage)
179 _Mgr::_S_create(_M_storage, __value);
180 static_assert(is_copy_constructible<_Tp>::value,
181 "The contained object must be CopyConstructible");
205 else if (
this != &__rhs)
210 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
216 template<
typename _ValueType>
217 enable_if_t<!is_same<any, decay_t<_ValueType>>::value,
any&>
220 *
this =
any(std::forward<_ValueType>(__rhs));
231 _M_manager(_Op_destroy,
this,
nullptr);
232 _M_manager =
nullptr;
239 if (empty() && __rhs.empty())
242 if (!empty() && !__rhs.empty())
249 __arg._M_any = &__tmp;
250 __rhs._M_manager(_Op_xfer, &__rhs, &__arg);
251 __arg._M_any = &__rhs;
252 _M_manager(_Op_xfer,
this, &__arg);
254 __tmp._M_manager(_Op_xfer, &__tmp, &__arg);
258 any* __empty = empty() ? this : &__rhs;
259 any* __full = empty() ? &__rhs :
this;
261 __arg._M_any = __empty;
262 __full->_M_manager(_Op_xfer, __full, &__arg);
269 bool empty() const noexcept {
return _M_manager ==
nullptr; }
278 _M_manager(_Op_get_type_info,
this, &__arg);
279 return *__arg._M_typeinfo;
283 template<
typename _Tp>
284 static constexpr
bool __is_valid_cast()
285 {
return __or_<is_reference<_Tp>, is_copy_constructible<_Tp>>::value; }
289 _Op_access, _Op_get_type_info, _Op_clone, _Op_destroy, _Op_xfer
299 void (*_M_manager)(_Op,
const any*, _Arg*);
302 template<
typename _Tp>
303 friend void* __any_caster(
const any* __any);
306 template<
typename _Tp>
307 struct _Manager_internal
310 _S_manage(_Op __which,
const any* __anyp, _Arg* __arg);
312 template<
typename _Up>
314 _S_create(_Storage& __storage, _Up&& __value)
316 void* __addr = &__storage._M_buffer;
317 ::new (__addr) _Tp(std::forward<_Up>(__value));
322 template<
typename _Tp>
323 struct _Manager_external
326 _S_manage(_Op __which,
const any* __anyp, _Arg* __arg);
328 template<
typename _Up>
330 _S_create(_Storage& __storage, _Up&& __value)
332 __storage._M_ptr =
new _Tp(std::forward<_Up>(__value));
338 inline void swap(
any& __x,
any& __y) noexcept { __x.swap(__y); }
350 template<
typename _ValueType>
353 static_assert(any::__is_valid_cast<_ValueType>(),
354 "Template argument must be a reference or CopyConstructible type");
355 auto __p =
any_cast<add_const_t<remove_reference_t<_ValueType>>>(&__any);
358 __throw_bad_any_cast();
373 template<
typename _ValueType>
376 static_assert(any::__is_valid_cast<_ValueType>(),
377 "Template argument must be a reference or CopyConstructible type");
378 auto __p =
any_cast<remove_reference_t<_ValueType>>(&__any);
381 __throw_bad_any_cast();
384 template<
typename _ValueType,
385 typename enable_if<!is_move_constructible<_ValueType>::value
390 static_assert(any::__is_valid_cast<_ValueType>(),
391 "Template argument must be a reference or CopyConstructible type");
392 auto __p =
any_cast<remove_reference_t<_ValueType>>(&__any);
395 __throw_bad_any_cast();
398 template<
typename _ValueType,
399 typename enable_if<is_move_constructible<_ValueType>::value
404 static_assert(any::__is_valid_cast<_ValueType>(),
405 "Template argument must be a reference or CopyConstructible type");
406 auto __p =
any_cast<remove_reference_t<_ValueType>>(&__any);
408 return std::move(*__p);
409 __throw_bad_any_cast();
413 template<
typename _Tp>
414 void* __any_caster(
const any* __any)
417 using _Up = decay_t<_Tp>;
418 using _Vp = conditional_t<is_copy_constructible<_Up>::value, _Up, _None>;
419 if (__any->_M_manager != &any::_Manager<_Vp>::_S_manage)
422 __any->_M_manager(any::_Op_access, __any, &__arg);
437 template<
typename _ValueType>
441 return static_cast<_ValueType*
>(__any_caster<_ValueType>(__any));
445 template<
typename _ValueType>
449 return static_cast<_ValueType*
>(__any_caster<_ValueType>(__any));
454 template<
typename _Tp>
456 any::_Manager_internal<_Tp>::
457 _S_manage(_Op __which,
const any* __any, _Arg* __arg)
460 auto __ptr =
reinterpret_cast<const _Tp*
>(&__any->_M_storage._M_buffer);
464 __arg->_M_obj =
const_cast<_Tp*
>(__ptr);
466 case _Op_get_type_info:
468 __arg->_M_typeinfo = &
typeid(_Tp);
472 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp(*__ptr);
473 __arg->_M_any->_M_manager = __any->_M_manager;
479 ::new(&__arg->_M_any->_M_storage._M_buffer) _Tp
480 (std::move(*const_cast<_Tp*>(__ptr)));
482 __arg->_M_any->_M_manager = __any->_M_manager;
483 const_cast<any*
>(__any)->_M_manager =
nullptr;
488 template<
typename _Tp>
490 any::_Manager_external<_Tp>::
491 _S_manage(_Op __which,
const any* __any, _Arg* __arg)
494 auto __ptr =
static_cast<const _Tp*
>(__any->_M_storage._M_ptr);
498 __arg->_M_obj =
const_cast<_Tp*
>(__ptr);
500 case _Op_get_type_info:
502 __arg->_M_typeinfo = &
typeid(_Tp);
506 __arg->_M_any->_M_storage._M_ptr =
new _Tp(*__ptr);
507 __arg->_M_any->_M_manager = __any->_M_manager;
513 __arg->_M_any->_M_storage._M_ptr = __any->_M_storage._M_ptr;
514 __arg->_M_any->_M_manager = __any->_M_manager;
515 const_cast<any*
>(__any)->_M_manager =
nullptr;
521 _GLIBCXX_END_NAMESPACE_VERSION
528 #endif // _GLIBCXX_EXPERIMENTAL_ANY ~any()
Destructor, calls clear()
Exception class thrown by a failed any_cast.
enable_if_t<!is_same< any, decay_t< _ValueType > >::value, any & > operator=(_ValueType &&__rhs)
Store a copy of __rhs as the contained object.
void clear() noexcept
If not empty, destroy the contained object.
void swap(any &__rhs) noexcept
Exchange state with another object.
any & operator=(any &&__rhs) noexcept
Move assignment operator.
any() noexcept
Default constructor, creates an empty 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.
ISO C++ entities toplevel namespace is std.
bool empty() const noexcept
Reports whether there is a contained object or not.
A type-safe container of any type.
any(_ValueType &&__value)
Construct with a copy of __value as the contained object.
any(const any &__other)
Copy constructor, copies the state of __other.
const type_info & type() const noexcept
The typeid of the contained object, or typeid(void) if empty.
virtual const char * what() const noexcept
_ValueType * any_cast(any *__any) noexcept
Access the contained object.
any(any &&__other) noexcept
Move constructor, transfer the state from __other.
any & operator=(const any &__rhs)
Copy the state of another object.