llvm-project/libcxx/include/any

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

699 lines
20 KiB
Plaintext
Raw Normal View History

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_ANY
#define _LIBCPP_ANY
/*
any synopsis
namespace std {
class bad_any_cast : public bad_cast
{
public:
virtual const char* what() const noexcept;
};
class any
{
public:
// 6.3.1 any construct/destruct
any() noexcept;
any(const any& other);
any(any&& other) noexcept;
template <class ValueType>
any(ValueType&& value);
~any();
// 6.3.2 any assignments
any& operator=(const any& rhs);
any& operator=(any&& rhs) noexcept;
template <class ValueType>
any& operator=(ValueType&& rhs);
// 6.3.3 any modifiers
template <class ValueType, class... Args>
decay_t<ValueType>& emplace(Args&&... args);
template <class ValueType, class U, class... Args>
decay_t<ValueType>& emplace(initializer_list<U>, Args&&...);
void reset() noexcept;
void swap(any& rhs) noexcept;
// 6.3.4 any observers
bool has_value() const noexcept;
const type_info& type() const noexcept;
};
// 6.4 Non-member functions
void swap(any& x, any& y) noexcept;
template <class T, class ...Args>
any make_any(Args&& ...args);
template <class T, class U, class ...Args>
any make_any(initializer_list<U>, Args&& ...args);
template<class ValueType>
ValueType any_cast(const any& operand);
template<class ValueType>
ValueType any_cast(any& operand);
template<class ValueType>
ValueType any_cast(any&& operand);
template<class ValueType>
const ValueType* any_cast(const any* operand) noexcept;
template<class ValueType>
ValueType* any_cast(any* operand) noexcept;
} // namespace std
*/
#include <__assert> // all public C++ headers provide the assertion handler
#include <__availability>
#include <__config>
#include <__utility/forward.h>
#include <__utility/in_place.h>
#include <__utility/move.h>
#include <__utility/unreachable.h>
#include <cstdlib>
#include <initializer_list>
#include <memory>
#include <type_traits>
#include <typeinfo>
#include <version>
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17
# include <chrono> // IGNORE-CYCLE due to <format>
[libc++] Re-add transitive includes that had been removed since LLVM 14 This commit re-adds transitive includes that had been removed by 4cd04d1687f1, c36870c8e79c, a83f4b9cda57, 1458458b558d, 2e2f3158c604, and 489637e66dd3. This should cover almost all the includes that had been removed since LLVM 14 and that would contribute to breaking user code when releasing LLVM 15. It is possible to disable the inclusion of these headers by defining _LIBCPP_REMOVE_TRANSITIVE_INCLUDES. The intent is that vendors will enable that macro and start fixing downstream issues immediately. We can then remove the macro (and the transitive includes) by default in a future release. That way, we will break users only once by removing transitive includes in bulk instead of doing it bit by bit a every release, which is more disruptive for users. Note 1: The set of headers to re-add was found by re-generating the transitive include test on a checkout of release/14.x, which provided the list of all transitive includes we used to provide. Note 2: Several includes of <vector>, <optional>, <array> and <unordered_map> have been added in this commit. These transitive inclusions were added when we implemented boyer_moore_searcher in <functional>. Note 3: This is a best effort patch to try and resolve downstream breakage caused since branching LLVM 14. I wasn't able to perfectly mirror transitive includes in LLVM 14 for a few headers, so I added a release note explaining it. To summarize, adding boyer_moore_searcher created a bunch of circular dependencies, so we have to break backwards compatibility in a few cases. Differential Revision: https://reviews.llvm.org/D128661
2022-06-28 03:53:41 +08:00
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
namespace std {
class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_BAD_ANY_CAST bad_any_cast : public bad_cast
{
public:
const char* what() const _NOEXCEPT override;
};
} // namespace std
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER > 14
_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
void __throw_bad_any_cast()
{
#ifndef _LIBCPP_NO_EXCEPTIONS
throw bad_any_cast();
#else
_VSTD::abort();
#endif
}
// Forward declarations
class _LIBCPP_TEMPLATE_VIS any;
template <class _ValueType>
_LIBCPP_INLINE_VISIBILITY
add_pointer_t<add_const_t<_ValueType>>
any_cast(any const *) _NOEXCEPT;
template <class _ValueType>
_LIBCPP_INLINE_VISIBILITY
add_pointer_t<_ValueType> any_cast(any *) _NOEXCEPT;
namespace __any_imp
{
using _Buffer = aligned_storage_t<3*sizeof(void*), alignment_of<void*>::value>;
template <class _Tp>
using _IsSmallObject = integral_constant<bool
, sizeof(_Tp) <= sizeof(_Buffer)
&& alignment_of<_Buffer>::value
% alignment_of<_Tp>::value == 0
&& is_nothrow_move_constructible<_Tp>::value
>;
enum class _Action {
_Destroy,
_Copy,
_Move,
_Get,
_TypeInfo
};
template <class _Tp> struct _SmallHandler;
template <class _Tp> struct _LargeHandler;
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS __unique_typeinfo { static constexpr int __id = 0; };
template <class _Tp> constexpr int __unique_typeinfo<_Tp>::__id;
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
constexpr const void* __get_fallback_typeid() {
return &__unique_typeinfo<remove_cv_t<remove_reference_t<_Tp>>>::__id;
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool __compare_typeid(type_info const* __id, const void* __fallback_id)
{
#if !defined(_LIBCPP_NO_RTTI)
if (__id && *__id == typeid(_Tp))
return true;
#endif
if (!__id && __fallback_id == __any_imp::__get_fallback_typeid<_Tp>())
return true;
return false;
}
template <class _Tp>
using _Handler = conditional_t<
_IsSmallObject<_Tp>::value, _SmallHandler<_Tp>, _LargeHandler<_Tp>>;
} // namespace __any_imp
class _LIBCPP_TEMPLATE_VIS any
{
public:
// construct/destruct
_LIBCPP_INLINE_VISIBILITY
constexpr any() _NOEXCEPT : __h_(nullptr) {}
_LIBCPP_INLINE_VISIBILITY
any(any const & __other) : __h_(nullptr)
{
if (__other.__h_) __other.__call(_Action::_Copy, this);
}
_LIBCPP_INLINE_VISIBILITY
any(any && __other) _NOEXCEPT : __h_(nullptr)
{
if (__other.__h_) __other.__call(_Action::_Move, this);
}
template <
class _ValueType
, class _Tp = decay_t<_ValueType>
, class = enable_if_t<
!is_same<_Tp, any>::value &&
!__is_inplace_type<_ValueType>::value &&
is_copy_constructible<_Tp>::value>
>
_LIBCPP_INLINE_VISIBILITY
any(_ValueType && __value);
template <class _ValueType, class ..._Args,
class _Tp = decay_t<_ValueType>,
class = enable_if_t<
is_constructible<_Tp, _Args...>::value &&
is_copy_constructible<_Tp>::value
>
>
_LIBCPP_INLINE_VISIBILITY
explicit any(in_place_type_t<_ValueType>, _Args&&... __args);
template <class _ValueType, class _Up, class ..._Args,
class _Tp = decay_t<_ValueType>,
class = enable_if_t<
is_constructible<_Tp, initializer_list<_Up>&, _Args...>::value &&
is_copy_constructible<_Tp>::value>
>
_LIBCPP_INLINE_VISIBILITY
explicit any(in_place_type_t<_ValueType>, initializer_list<_Up>, _Args&&... __args);
_LIBCPP_INLINE_VISIBILITY
~any() { this->reset(); }
// assignments
_LIBCPP_INLINE_VISIBILITY
any & operator=(any const & __rhs) {
any(__rhs).swap(*this);
return *this;
}
_LIBCPP_INLINE_VISIBILITY
any & operator=(any && __rhs) _NOEXCEPT {
any(_VSTD::move(__rhs)).swap(*this);
return *this;
}
template <
class _ValueType
, class _Tp = decay_t<_ValueType>
, class = enable_if_t<
!is_same<_Tp, any>::value
&& is_copy_constructible<_Tp>::value>
>
_LIBCPP_INLINE_VISIBILITY
any & operator=(_ValueType && __rhs);
template <class _ValueType, class ..._Args,
class _Tp = decay_t<_ValueType>,
class = enable_if_t<
is_constructible<_Tp, _Args...>::value &&
is_copy_constructible<_Tp>::value>
>
_LIBCPP_INLINE_VISIBILITY
_Tp& emplace(_Args&&...);
template <class _ValueType, class _Up, class ..._Args,
class _Tp = decay_t<_ValueType>,
class = enable_if_t<
is_constructible<_Tp, initializer_list<_Up>&, _Args...>::value &&
is_copy_constructible<_Tp>::value>
>
_LIBCPP_INLINE_VISIBILITY
_Tp& emplace(initializer_list<_Up>, _Args&&...);
// 6.3.3 any modifiers
_LIBCPP_INLINE_VISIBILITY
void reset() _NOEXCEPT { if (__h_) this->__call(_Action::_Destroy); }
_LIBCPP_INLINE_VISIBILITY
void swap(any & __rhs) _NOEXCEPT;
// 6.3.4 any observers
_LIBCPP_INLINE_VISIBILITY
bool has_value() const _NOEXCEPT { return __h_ != nullptr; }
#if !defined(_LIBCPP_NO_RTTI)
_LIBCPP_INLINE_VISIBILITY
const type_info & type() const _NOEXCEPT {
if (__h_) {
return *static_cast<type_info const *>(this->__call(_Action::_TypeInfo));
} else {
return typeid(void);
}
}
#endif
private:
typedef __any_imp::_Action _Action;
using _HandleFuncPtr = void* (*)(_Action, any const *, any *, const type_info *,
const void* __fallback_info);
union _Storage {
constexpr _Storage() : __ptr(nullptr) {}
void * __ptr;
__any_imp::_Buffer __buf;
};
_LIBCPP_INLINE_VISIBILITY
void * __call(_Action __a, any * __other = nullptr,
type_info const * __info = nullptr,
const void* __fallback_info = nullptr) const
{
return __h_(__a, this, __other, __info, __fallback_info);
}
_LIBCPP_INLINE_VISIBILITY
void * __call(_Action __a, any * __other = nullptr,
type_info const * __info = nullptr,
const void* __fallback_info = nullptr)
{
return __h_(__a, this, __other, __info, __fallback_info);
}
template <class>
friend struct __any_imp::_SmallHandler;
template <class>
friend struct __any_imp::_LargeHandler;
template <class _ValueType>
friend add_pointer_t<add_const_t<_ValueType>>
any_cast(any const *) _NOEXCEPT;
template <class _ValueType>
friend add_pointer_t<_ValueType>
any_cast(any *) _NOEXCEPT;
_HandleFuncPtr __h_ = nullptr;
_Storage __s_;
};
namespace __any_imp
{
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS _SmallHandler
{
_LIBCPP_INLINE_VISIBILITY
static void* __handle(_Action __act, any const * __this, any * __other,
type_info const * __info, const void* __fallback_info)
{
switch (__act)
{
case _Action::_Destroy:
__destroy(const_cast<any &>(*__this));
return nullptr;
case _Action::_Copy:
__copy(*__this, *__other);
return nullptr;
case _Action::_Move:
__move(const_cast<any &>(*__this), *__other);
return nullptr;
case _Action::_Get:
return __get(const_cast<any &>(*__this), __info, __fallback_info);
case _Action::_TypeInfo:
return __type_info();
}
__libcpp_unreachable();
}
template <class ..._Args>
_LIBCPP_INLINE_VISIBILITY
static _Tp& __create(any & __dest, _Args&&... __args) {
typedef allocator<_Tp> _Alloc;
typedef allocator_traits<_Alloc> _ATraits;
_Alloc __a;
_Tp * __ret = static_cast<_Tp*>(static_cast<void*>(&__dest.__s_.__buf));
_ATraits::construct(__a, __ret, _VSTD::forward<_Args>(__args)...);
__dest.__h_ = &_SmallHandler::__handle;
return *__ret;
}
private:
_LIBCPP_INLINE_VISIBILITY
static void __destroy(any & __this) {
typedef allocator<_Tp> _Alloc;
typedef allocator_traits<_Alloc> _ATraits;
_Alloc __a;
_Tp * __p = static_cast<_Tp *>(static_cast<void*>(&__this.__s_.__buf));
_ATraits::destroy(__a, __p);
__this.__h_ = nullptr;
}
_LIBCPP_INLINE_VISIBILITY
static void __copy(any const & __this, any & __dest) {
_SmallHandler::__create(__dest, *static_cast<_Tp const *>(
static_cast<void const *>(&__this.__s_.__buf)));
}
_LIBCPP_INLINE_VISIBILITY
static void __move(any & __this, any & __dest) {
_SmallHandler::__create(__dest, _VSTD::move(
*static_cast<_Tp*>(static_cast<void*>(&__this.__s_.__buf))));
__destroy(__this);
}
_LIBCPP_INLINE_VISIBILITY
static void* __get(any & __this,
type_info const * __info,
const void* __fallback_id)
{
if (__any_imp::__compare_typeid<_Tp>(__info, __fallback_id))
return static_cast<void*>(&__this.__s_.__buf);
return nullptr;
}
_LIBCPP_INLINE_VISIBILITY
static void* __type_info()
{
#if !defined(_LIBCPP_NO_RTTI)
return const_cast<void*>(static_cast<void const *>(&typeid(_Tp)));
#else
return nullptr;
#endif
}
};
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS _LargeHandler
{
_LIBCPP_INLINE_VISIBILITY
static void* __handle(_Action __act, any const * __this,
any * __other, type_info const * __info,
void const* __fallback_info)
{
switch (__act)
{
case _Action::_Destroy:
__destroy(const_cast<any &>(*__this));
return nullptr;
case _Action::_Copy:
__copy(*__this, *__other);
return nullptr;
case _Action::_Move:
__move(const_cast<any &>(*__this), *__other);
return nullptr;
case _Action::_Get:
return __get(const_cast<any &>(*__this), __info, __fallback_info);
case _Action::_TypeInfo:
return __type_info();
}
__libcpp_unreachable();
}
template <class ..._Args>
_LIBCPP_INLINE_VISIBILITY
static _Tp& __create(any & __dest, _Args&&... __args) {
typedef allocator<_Tp> _Alloc;
typedef allocator_traits<_Alloc> _ATraits;
typedef __allocator_destructor<_Alloc> _Dp;
_Alloc __a;
unique_ptr<_Tp, _Dp> __hold(_ATraits::allocate(__a, 1), _Dp(__a, 1));
_Tp * __ret = __hold.get();
_ATraits::construct(__a, __ret, _VSTD::forward<_Args>(__args)...);
__dest.__s_.__ptr = __hold.release();
__dest.__h_ = &_LargeHandler::__handle;
return *__ret;
}
private:
_LIBCPP_INLINE_VISIBILITY
static void __destroy(any & __this){
typedef allocator<_Tp> _Alloc;
typedef allocator_traits<_Alloc> _ATraits;
_Alloc __a;
_Tp * __p = static_cast<_Tp *>(__this.__s_.__ptr);
_ATraits::destroy(__a, __p);
_ATraits::deallocate(__a, __p, 1);
__this.__h_ = nullptr;
}
_LIBCPP_INLINE_VISIBILITY
static void __copy(any const & __this, any & __dest) {
_LargeHandler::__create(__dest, *static_cast<_Tp const *>(__this.__s_.__ptr));
}
_LIBCPP_INLINE_VISIBILITY
static void __move(any & __this, any & __dest) {
__dest.__s_.__ptr = __this.__s_.__ptr;
__dest.__h_ = &_LargeHandler::__handle;
__this.__h_ = nullptr;
}
_LIBCPP_INLINE_VISIBILITY
static void* __get(any & __this, type_info const * __info,
void const* __fallback_info)
{
if (__any_imp::__compare_typeid<_Tp>(__info, __fallback_info))
return static_cast<void*>(__this.__s_.__ptr);
return nullptr;
}
_LIBCPP_INLINE_VISIBILITY
static void* __type_info()
{
#if !defined(_LIBCPP_NO_RTTI)
return const_cast<void*>(static_cast<void const *>(&typeid(_Tp)));
#else
return nullptr;
#endif
}
};
} // namespace __any_imp
template <class _ValueType, class _Tp, class>
any::any(_ValueType && __v) : __h_(nullptr)
{
__any_imp::_Handler<_Tp>::__create(*this, _VSTD::forward<_ValueType>(__v));
}
template <class _ValueType, class ..._Args, class _Tp, class>
any::any(in_place_type_t<_ValueType>, _Args&&... __args) {
__any_imp::_Handler<_Tp>::__create(*this, _VSTD::forward<_Args>(__args)...);
}
template <class _ValueType, class _Up, class ..._Args, class _Tp, class>
any::any(in_place_type_t<_ValueType>, initializer_list<_Up> __il, _Args&&... __args) {
__any_imp::_Handler<_Tp>::__create(*this, __il, _VSTD::forward<_Args>(__args)...);
}
template <class _ValueType, class, class>
inline _LIBCPP_INLINE_VISIBILITY
any & any::operator=(_ValueType && __v)
{
any(_VSTD::forward<_ValueType>(__v)).swap(*this);
return *this;
}
template <class _ValueType, class ..._Args, class _Tp, class>
inline _LIBCPP_INLINE_VISIBILITY
_Tp& any::emplace(_Args&&... __args) {
reset();
return __any_imp::_Handler<_Tp>::__create(*this, _VSTD::forward<_Args>(__args)...);
}
template <class _ValueType, class _Up, class ..._Args, class _Tp, class>
inline _LIBCPP_INLINE_VISIBILITY
_Tp& any::emplace(initializer_list<_Up> __il, _Args&&... __args) {
reset();
return __any_imp::_Handler<_Tp>::__create(*this, __il, _VSTD::forward<_Args>(__args)...);
}
inline _LIBCPP_INLINE_VISIBILITY
void any::swap(any & __rhs) _NOEXCEPT
{
if (this == &__rhs)
return;
if (__h_ && __rhs.__h_) {
any __tmp;
__rhs.__call(_Action::_Move, &__tmp);
this->__call(_Action::_Move, &__rhs);
__tmp.__call(_Action::_Move, this);
}
else if (__h_) {
this->__call(_Action::_Move, &__rhs);
}
else if (__rhs.__h_) {
__rhs.__call(_Action::_Move, this);
}
}
// 6.4 Non-member functions
inline _LIBCPP_INLINE_VISIBILITY
void swap(any & __lhs, any & __rhs) _NOEXCEPT
{
__lhs.swap(__rhs);
}
template <class _Tp, class ..._Args>
inline _LIBCPP_INLINE_VISIBILITY
any make_any(_Args&&... __args) {
return any(in_place_type<_Tp>, _VSTD::forward<_Args>(__args)...);
}
template <class _Tp, class _Up, class ..._Args>
inline _LIBCPP_INLINE_VISIBILITY
any make_any(initializer_list<_Up> __il, _Args&&... __args) {
return any(in_place_type<_Tp>, __il, _VSTD::forward<_Args>(__args)...);
}
template <class _ValueType>
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
_ValueType any_cast(any const & __v)
{
using _RawValueType = __uncvref_t<_ValueType>;
static_assert(is_constructible<_ValueType, _RawValueType const &>::value,
"ValueType is required to be a const lvalue reference "
"or a CopyConstructible type");
auto __tmp = _VSTD::any_cast<add_const_t<_RawValueType>>(&__v);
if (__tmp == nullptr)
__throw_bad_any_cast();
return static_cast<_ValueType>(*__tmp);
}
template <class _ValueType>
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
_ValueType any_cast(any & __v)
{
using _RawValueType = __uncvref_t<_ValueType>;
static_assert(is_constructible<_ValueType, _RawValueType &>::value,
"ValueType is required to be an lvalue reference "
"or a CopyConstructible type");
auto __tmp = _VSTD::any_cast<_RawValueType>(&__v);
if (__tmp == nullptr)
__throw_bad_any_cast();
return static_cast<_ValueType>(*__tmp);
}
template <class _ValueType>
inline _LIBCPP_INLINE_VISIBILITY
_LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
_ValueType any_cast(any && __v)
{
using _RawValueType = __uncvref_t<_ValueType>;
static_assert(is_constructible<_ValueType, _RawValueType>::value,
"ValueType is required to be an rvalue reference "
"or a CopyConstructible type");
auto __tmp = _VSTD::any_cast<_RawValueType>(&__v);
if (__tmp == nullptr)
__throw_bad_any_cast();
return static_cast<_ValueType>(_VSTD::move(*__tmp));
}
template <class _ValueType>
inline _LIBCPP_INLINE_VISIBILITY
add_pointer_t<add_const_t<_ValueType>>
any_cast(any const * __any) _NOEXCEPT
{
static_assert(!is_reference<_ValueType>::value,
"_ValueType may not be a reference.");
return _VSTD::any_cast<_ValueType>(const_cast<any *>(__any));
}
template <class _RetType>
inline _LIBCPP_INLINE_VISIBILITY
_RetType __pointer_or_func_cast(void* __p, /*IsFunction*/false_type) noexcept {
return static_cast<_RetType>(__p);
}
template <class _RetType>
inline _LIBCPP_INLINE_VISIBILITY
_RetType __pointer_or_func_cast(void*, /*IsFunction*/true_type) noexcept {
return nullptr;
}
template <class _ValueType>
_LIBCPP_HIDE_FROM_ABI
add_pointer_t<_ValueType>
any_cast(any * __any) _NOEXCEPT
{
using __any_imp::_Action;
static_assert(!is_reference<_ValueType>::value,
"_ValueType may not be a reference.");
typedef typename add_pointer<_ValueType>::type _ReturnType;
if (__any && __any->__h_) {
void *__p = __any->__call(_Action::_Get, nullptr,
#if !defined(_LIBCPP_NO_RTTI)
&typeid(_ValueType),
#else
nullptr,
#endif
__any_imp::__get_fallback_typeid<_ValueType>());
return _VSTD::__pointer_or_func_cast<_ReturnType>(
__p, is_function<_ValueType>{});
}
return nullptr;
}
#endif // _LIBCPP_STD_VER > 14
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_ANY