forked from OSchip/llvm-project
685 lines
19 KiB
C++
685 lines
19 KiB
C++
// -*- C++ -*-
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//===------------------------------ any -----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_ANY
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#define _LIBCPP_ANY
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/*
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any synopsis
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namespace std {
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class bad_any_cast : public bad_cast
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{
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public:
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virtual const char* what() const noexcept;
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};
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class any
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{
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public:
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// 6.3.1 any construct/destruct
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any() noexcept;
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any(const any& other);
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any(any&& other) noexcept;
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template <class ValueType>
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any(ValueType&& value);
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~any();
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// 6.3.2 any assignments
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any& operator=(const any& rhs);
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any& operator=(any&& rhs) noexcept;
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template <class ValueType>
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any& operator=(ValueType&& rhs);
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// 6.3.3 any modifiers
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template <class ValueType, class... Args>
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decay_t<ValueType>& emplace(Args&&... args);
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template <class ValueType, class U, class... Args>
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decay_t<ValueType>& emplace(initializer_list<U>, Args&&...);
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void reset() noexcept;
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void swap(any& rhs) noexcept;
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// 6.3.4 any observers
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bool has_value() const noexcept;
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const type_info& type() const noexcept;
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};
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// 6.4 Non-member functions
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void swap(any& x, any& y) noexcept;
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template <class T, class ...Args>
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any make_any(Args&& ...args);
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template <class T, class U, class ...Args>
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any make_any(initializer_list<U>, Args&& ...args);
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template<class ValueType>
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ValueType any_cast(const any& operand);
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template<class ValueType>
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ValueType any_cast(any& operand);
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template<class ValueType>
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ValueType any_cast(any&& operand);
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template<class ValueType>
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const ValueType* any_cast(const any* operand) noexcept;
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template<class ValueType>
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ValueType* any_cast(any* operand) noexcept;
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} // namespace std
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*/
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#include <experimental/__config>
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#include <memory>
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#include <typeinfo>
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#include <type_traits>
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#include <cstdlib>
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#include <version>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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namespace std {
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class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_BAD_ANY_CAST bad_any_cast : public bad_cast
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{
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public:
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virtual const char* what() const _NOEXCEPT;
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};
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} // namespace std
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 14
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_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
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_LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
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void __throw_bad_any_cast()
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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throw bad_any_cast();
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#else
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_VSTD::abort();
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#endif
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}
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// Forward declarations
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class _LIBCPP_TEMPLATE_VIS any;
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template <class _ValueType>
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_LIBCPP_INLINE_VISIBILITY
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add_pointer_t<add_const_t<_ValueType>>
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any_cast(any const *) _NOEXCEPT;
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template <class _ValueType>
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_LIBCPP_INLINE_VISIBILITY
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add_pointer_t<_ValueType> any_cast(any *) _NOEXCEPT;
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namespace __any_imp
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{
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using _Buffer = aligned_storage_t<3*sizeof(void*), alignment_of<void*>::value>;
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template <class _Tp>
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using _IsSmallObject = integral_constant<bool
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, sizeof(_Tp) <= sizeof(_Buffer)
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&& alignment_of<_Buffer>::value
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% alignment_of<_Tp>::value == 0
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&& is_nothrow_move_constructible<_Tp>::value
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>;
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enum class _Action {
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_Destroy,
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_Copy,
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_Move,
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_Get,
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_TypeInfo
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};
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template <class _Tp> struct _SmallHandler;
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template <class _Tp> struct _LargeHandler;
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template <class _Tp>
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struct _LIBCPP_TEMPLATE_VIS __unique_typeinfo { static constexpr int __id = 0; };
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template <class _Tp> constexpr int __unique_typeinfo<_Tp>::__id;
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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constexpr const void* __get_fallback_typeid() {
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return &__unique_typeinfo<remove_cv_t<remove_reference_t<_Tp>>>::__id;
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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bool __compare_typeid(type_info const* __id, const void* __fallback_id)
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{
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#if !defined(_LIBCPP_NO_RTTI)
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if (__id && *__id == typeid(_Tp))
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return true;
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#endif
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if (!__id && __fallback_id == __any_imp::__get_fallback_typeid<_Tp>())
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return true;
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return false;
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}
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template <class _Tp>
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using _Handler = conditional_t<
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_IsSmallObject<_Tp>::value, _SmallHandler<_Tp>, _LargeHandler<_Tp>>;
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} // namespace __any_imp
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class _LIBCPP_TEMPLATE_VIS any
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{
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public:
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// construct/destruct
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_LIBCPP_INLINE_VISIBILITY
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constexpr any() _NOEXCEPT : __h(nullptr) {}
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_LIBCPP_INLINE_VISIBILITY
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any(any const & __other) : __h(nullptr)
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{
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if (__other.__h) __other.__call(_Action::_Copy, this);
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}
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_LIBCPP_INLINE_VISIBILITY
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any(any && __other) _NOEXCEPT : __h(nullptr)
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{
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if (__other.__h) __other.__call(_Action::_Move, this);
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}
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template <
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class _ValueType
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, class _Tp = decay_t<_ValueType>
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, class = enable_if_t<
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!is_same<_Tp, any>::value &&
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!__is_inplace_type<_ValueType>::value &&
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is_copy_constructible<_Tp>::value>
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>
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_LIBCPP_INLINE_VISIBILITY
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any(_ValueType && __value);
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template <class _ValueType, class ..._Args,
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class _Tp = decay_t<_ValueType>,
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class = enable_if_t<
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is_constructible<_Tp, _Args...>::value &&
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is_copy_constructible<_Tp>::value
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>
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>
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_LIBCPP_INLINE_VISIBILITY
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explicit any(in_place_type_t<_ValueType>, _Args&&... __args);
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template <class _ValueType, class _Up, class ..._Args,
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class _Tp = decay_t<_ValueType>,
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class = enable_if_t<
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is_constructible<_Tp, initializer_list<_Up>&, _Args...>::value &&
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is_copy_constructible<_Tp>::value>
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>
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_LIBCPP_INLINE_VISIBILITY
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explicit any(in_place_type_t<_ValueType>, initializer_list<_Up>, _Args&&... __args);
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_LIBCPP_INLINE_VISIBILITY
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~any() { this->reset(); }
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// assignments
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_LIBCPP_INLINE_VISIBILITY
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any & operator=(any const & __rhs) {
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any(__rhs).swap(*this);
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return *this;
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}
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_LIBCPP_INLINE_VISIBILITY
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any & operator=(any && __rhs) _NOEXCEPT {
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any(_VSTD::move(__rhs)).swap(*this);
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return *this;
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}
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template <
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class _ValueType
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, class _Tp = decay_t<_ValueType>
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, class = enable_if_t<
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!is_same<_Tp, any>::value
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&& is_copy_constructible<_Tp>::value>
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>
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_LIBCPP_INLINE_VISIBILITY
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any & operator=(_ValueType && __rhs);
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template <class _ValueType, class ..._Args,
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class _Tp = decay_t<_ValueType>,
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class = enable_if_t<
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is_constructible<_Tp, _Args...>::value &&
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is_copy_constructible<_Tp>::value>
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>
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_LIBCPP_INLINE_VISIBILITY
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_Tp& emplace(_Args&&... args);
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template <class _ValueType, class _Up, class ..._Args,
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class _Tp = decay_t<_ValueType>,
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class = enable_if_t<
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is_constructible<_Tp, initializer_list<_Up>&, _Args...>::value &&
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is_copy_constructible<_Tp>::value>
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>
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_LIBCPP_INLINE_VISIBILITY
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_Tp& emplace(initializer_list<_Up>, _Args&&...);
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// 6.3.3 any modifiers
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_LIBCPP_INLINE_VISIBILITY
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void reset() _NOEXCEPT { if (__h) this->__call(_Action::_Destroy); }
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_LIBCPP_INLINE_VISIBILITY
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void swap(any & __rhs) _NOEXCEPT;
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// 6.3.4 any observers
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_LIBCPP_INLINE_VISIBILITY
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bool has_value() const _NOEXCEPT { return __h != nullptr; }
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#if !defined(_LIBCPP_NO_RTTI)
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_LIBCPP_INLINE_VISIBILITY
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const type_info & type() const _NOEXCEPT {
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if (__h) {
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return *static_cast<type_info const *>(this->__call(_Action::_TypeInfo));
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} else {
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return typeid(void);
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}
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}
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#endif
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private:
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typedef __any_imp::_Action _Action;
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using _HandleFuncPtr = void* (*)(_Action, any const *, any *, const type_info *,
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const void* __fallback_info);
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union _Storage {
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constexpr _Storage() : __ptr(nullptr) {}
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void * __ptr;
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__any_imp::_Buffer __buf;
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};
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_LIBCPP_INLINE_VISIBILITY
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void * __call(_Action __a, any * __other = nullptr,
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type_info const * __info = nullptr,
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const void* __fallback_info = nullptr) const
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{
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return __h(__a, this, __other, __info, __fallback_info);
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}
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_LIBCPP_INLINE_VISIBILITY
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void * __call(_Action __a, any * __other = nullptr,
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type_info const * __info = nullptr,
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const void* __fallback_info = nullptr)
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{
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return __h(__a, this, __other, __info, __fallback_info);
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}
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template <class>
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friend struct __any_imp::_SmallHandler;
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template <class>
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friend struct __any_imp::_LargeHandler;
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template <class _ValueType>
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friend add_pointer_t<add_const_t<_ValueType>>
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any_cast(any const *) _NOEXCEPT;
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template <class _ValueType>
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friend add_pointer_t<_ValueType>
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any_cast(any *) _NOEXCEPT;
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_HandleFuncPtr __h = nullptr;
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_Storage __s;
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};
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namespace __any_imp
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{
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template <class _Tp>
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struct _LIBCPP_TEMPLATE_VIS _SmallHandler
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{
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_LIBCPP_INLINE_VISIBILITY
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static void* __handle(_Action __act, any const * __this, any * __other,
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type_info const * __info, const void* __fallback_info)
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{
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switch (__act)
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{
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case _Action::_Destroy:
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__destroy(const_cast<any &>(*__this));
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return nullptr;
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case _Action::_Copy:
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__copy(*__this, *__other);
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return nullptr;
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case _Action::_Move:
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__move(const_cast<any &>(*__this), *__other);
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return nullptr;
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case _Action::_Get:
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return __get(const_cast<any &>(*__this), __info, __fallback_info);
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case _Action::_TypeInfo:
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return __type_info();
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}
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}
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template <class ..._Args>
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_LIBCPP_INLINE_VISIBILITY
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static _Tp& __create(any & __dest, _Args&&... __args) {
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typedef allocator<_Tp> _Alloc;
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typedef allocator_traits<_Alloc> _ATraits;
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_Alloc __a;
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_Tp * __ret = static_cast<_Tp*>(static_cast<void*>(&__dest.__s.__buf));
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_ATraits::construct(__a, __ret, _VSTD::forward<_Args>(__args)...);
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__dest.__h = &_SmallHandler::__handle;
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return *__ret;
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}
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private:
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_LIBCPP_INLINE_VISIBILITY
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static void __destroy(any & __this) {
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typedef allocator<_Tp> _Alloc;
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typedef allocator_traits<_Alloc> _ATraits;
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_Alloc __a;
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_Tp * __p = static_cast<_Tp *>(static_cast<void*>(&__this.__s.__buf));
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_ATraits::destroy(__a, __p);
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__this.__h = nullptr;
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}
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_LIBCPP_INLINE_VISIBILITY
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static void __copy(any const & __this, any & __dest) {
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_SmallHandler::__create(__dest, *static_cast<_Tp const *>(
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static_cast<void const *>(&__this.__s.__buf)));
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}
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_LIBCPP_INLINE_VISIBILITY
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static void __move(any & __this, any & __dest) {
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_SmallHandler::__create(__dest, _VSTD::move(
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*static_cast<_Tp*>(static_cast<void*>(&__this.__s.__buf))));
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__destroy(__this);
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}
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_LIBCPP_INLINE_VISIBILITY
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static void* __get(any & __this,
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type_info const * __info,
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const void* __fallback_id)
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{
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if (__any_imp::__compare_typeid<_Tp>(__info, __fallback_id))
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return static_cast<void*>(&__this.__s.__buf);
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return nullptr;
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}
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_LIBCPP_INLINE_VISIBILITY
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static void* __type_info()
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{
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#if !defined(_LIBCPP_NO_RTTI)
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return const_cast<void*>(static_cast<void const *>(&typeid(_Tp)));
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#else
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return nullptr;
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#endif
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}
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};
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template <class _Tp>
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struct _LIBCPP_TEMPLATE_VIS _LargeHandler
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{
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_LIBCPP_INLINE_VISIBILITY
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static void* __handle(_Action __act, any const * __this,
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any * __other, type_info const * __info,
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void const* __fallback_info)
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{
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switch (__act)
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{
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case _Action::_Destroy:
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__destroy(const_cast<any &>(*__this));
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return nullptr;
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case _Action::_Copy:
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__copy(*__this, *__other);
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return nullptr;
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case _Action::_Move:
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__move(const_cast<any &>(*__this), *__other);
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return nullptr;
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case _Action::_Get:
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return __get(const_cast<any &>(*__this), __info, __fallback_info);
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case _Action::_TypeInfo:
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return __type_info();
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}
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}
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template <class ..._Args>
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_LIBCPP_INLINE_VISIBILITY
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static _Tp& __create(any & __dest, _Args&&... __args) {
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typedef allocator<_Tp> _Alloc;
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typedef allocator_traits<_Alloc> _ATraits;
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typedef __allocator_destructor<_Alloc> _Dp;
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_Alloc __a;
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unique_ptr<_Tp, _Dp> __hold(_ATraits::allocate(__a, 1), _Dp(__a, 1));
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_Tp * __ret = __hold.get();
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_ATraits::construct(__a, __ret, _VSTD::forward<_Args>(__args)...);
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__dest.__s.__ptr = __hold.release();
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__dest.__h = &_LargeHandler::__handle;
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return *__ret;
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}
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private:
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_LIBCPP_INLINE_VISIBILITY
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static void __destroy(any & __this){
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typedef allocator<_Tp> _Alloc;
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typedef allocator_traits<_Alloc> _ATraits;
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_Alloc __a;
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_Tp * __p = static_cast<_Tp *>(__this.__s.__ptr);
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_ATraits::destroy(__a, __p);
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_ATraits::deallocate(__a, __p, 1);
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__this.__h = nullptr;
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}
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_LIBCPP_INLINE_VISIBILITY
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static void __copy(any const & __this, any & __dest) {
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_LargeHandler::__create(__dest, *static_cast<_Tp const *>(__this.__s.__ptr));
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}
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_LIBCPP_INLINE_VISIBILITY
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static void __move(any & __this, any & __dest) {
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__dest.__s.__ptr = __this.__s.__ptr;
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__dest.__h = &_LargeHandler::__handle;
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__this.__h = nullptr;
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}
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_LIBCPP_INLINE_VISIBILITY
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static void* __get(any & __this, type_info const * __info,
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void const* __fallback_info)
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{
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if (__any_imp::__compare_typeid<_Tp>(__info, __fallback_info))
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return static_cast<void*>(__this.__s.__ptr);
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return nullptr;
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}
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_LIBCPP_INLINE_VISIBILITY
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static void* __type_info()
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{
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#if !defined(_LIBCPP_NO_RTTI)
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return const_cast<void*>(static_cast<void const *>(&typeid(_Tp)));
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#else
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return nullptr;
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#endif
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}
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};
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} // namespace __any_imp
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template <class _ValueType, class _Tp, class>
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any::any(_ValueType && __v) : __h(nullptr)
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{
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__any_imp::_Handler<_Tp>::__create(*this, _VSTD::forward<_ValueType>(__v));
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}
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template <class _ValueType, class ..._Args, class _Tp, class>
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any::any(in_place_type_t<_ValueType>, _Args&&... __args) {
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__any_imp::_Handler<_Tp>::__create(*this, _VSTD::forward<_Args>(__args)...);
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}
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template <class _ValueType, class _Up, class ..._Args, class _Tp, class>
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any::any(in_place_type_t<_ValueType>, initializer_list<_Up> __il, _Args&&... __args) {
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__any_imp::_Handler<_Tp>::__create(*this, __il, _VSTD::forward<_Args>(__args)...);
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}
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|
|
|
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>
|
|
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
|