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// <experimental/any> -*- C++ -*- |
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|
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// Copyright (C) 2014-2021 Free Software Foundation, Inc. |
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// |
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// This file is part of the GNU ISO C++ Library. This library is free |
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// software; you can redistribute it and/or modify it under the |
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// terms of the GNU General Public License as published by the |
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// Free Software Foundation; either version 3, or (at your option) |
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// any later version. |
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|
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// This library is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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|
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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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|
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// <http://www.gnu.org/licenses/>. |
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|
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/** @file experimental/any |
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* This is a TS C++ Library header. |
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* @ingroup libfund-ts |
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*/ |
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|
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#ifndef _GLIBCXX_EXPERIMENTAL_ANY |
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#define _GLIBCXX_EXPERIMENTAL_ANY 1 |
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|
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#pragma GCC system_header |
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|
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#if __cplusplus >= 201402L |
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|
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#include <typeinfo> |
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#include <new> |
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#include <utility> |
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#include <type_traits> |
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#include <experimental/bits/lfts_config.h> |
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|
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namespace std _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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namespace experimental |
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{ |
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inline namespace fundamentals_v1 |
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{ |
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/** |
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* @defgroup any Type-safe container of any type |
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* @ingroup libfund-ts |
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* |
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* A type-safe container for single values of value types, as |
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* described in n3804 "Any Library Proposal (Revision 3)". |
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* |
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* @{ |
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*/ |
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|
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#define __cpp_lib_experimental_any 201411 |
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|
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/** |
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* @brief Exception class thrown by a failed @c any_cast |
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* @ingroup exceptions |
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*/ |
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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 { return "bad any_cast"; } |
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}; |
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|
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/// @cond undocumented |
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[[gnu::noreturn]] inline void __throw_bad_any_cast() |
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{ |
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#if __cpp_exceptions |
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throw bad_any_cast{}; |
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#else |
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__builtin_abort(); |
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#endif |
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} |
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/// @endcond |
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|
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/** |
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* @brief A type-safe container of any type. |
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* |
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* An @c any object's state is either empty or it stores a contained object |
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* of CopyConstructible type. |
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*/ |
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class any |
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{ |
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// Holds either pointer to a heap object or the contained object itself. |
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union _Storage |
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{ |
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// This constructor intentionally doesn't initialize anything. |
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_Storage() = default; |
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|
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// Prevent trivial copies of this type, buffer might hold a non-POD. |
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_Storage(const _Storage&) = delete; |
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_Storage& operator=(const _Storage&) = delete; |
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|
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void* _M_ptr; |
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aligned_storage<sizeof(_M_ptr), alignof(void*)>::type _M_buffer; |
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}; |
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|
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template<typename _Tp, typename _Safe = is_nothrow_move_constructible<_Tp>, |
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bool _Fits = (sizeof(_Tp) <= sizeof(_Storage)) |
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&& (alignof(_Tp) <= alignof(_Storage))> |
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using _Internal = std::integral_constant<bool, _Safe::value && _Fits>; |
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|
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template<typename _Tp> |
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struct _Manager_internal; // uses small-object optimization |
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|
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template<typename _Tp> |
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struct _Manager_external; // creates contained object on the heap |
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|
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template<typename _Tp> |
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using _Manager = conditional_t<_Internal<_Tp>::value, |
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_Manager_internal<_Tp>, |
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_Manager_external<_Tp>>; |
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|
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template<typename _Tp, typename _Decayed = decay_t<_Tp>> |
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using _Decay = enable_if_t<!is_same<_Decayed, any>::value, _Decayed>; |
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|
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public: |
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// construct/destruct |
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|
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/// Default constructor, creates an empty object. |
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any() noexcept : _M_manager(nullptr) { } |
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|
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/// Copy constructor, copies the state of @p __other |
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any(const any& __other) |
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{ |
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if (__other.empty()) |
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_M_manager = nullptr; |
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else |
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{ |
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_Arg __arg; |
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__arg._M_any = this; |
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__other._M_manager(_Op_clone, &__other, &__arg); |
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} |
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} |
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|
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/** |
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* @brief Move constructor, transfer the state from @p __other |
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* |
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* @post @c __other.empty() (this postcondition is a GNU extension) |
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*/ |
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any(any&& __other) noexcept |
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{ |
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if (__other.empty()) |
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_M_manager = nullptr; |
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else |
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{ |
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_Arg __arg; |
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__arg._M_any = this; |
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__other._M_manager(_Op_xfer, &__other, &__arg); |
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} |
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} |
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|
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/// Construct with a copy of @p __value as the contained object. |
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template <typename _ValueType, typename _Tp = _Decay<_ValueType>, |
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typename _Mgr = _Manager<_Tp>, |
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typename enable_if<is_constructible<_Tp, _ValueType&&>::value, |
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bool>::type = true> |
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any(_ValueType&& __value) |
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: _M_manager(&_Mgr::_S_manage) |
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{ |
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_Mgr::_S_create(_M_storage, std::forward<_ValueType>(__value)); |
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static_assert(is_copy_constructible<_Tp>::value, |
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"The contained object must be CopyConstructible"); |
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} |
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|
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/// Construct with a copy of @p __value as the contained object. |
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template <typename _ValueType, typename _Tp = _Decay<_ValueType>, |
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typename _Mgr = _Manager<_Tp>, |
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typename enable_if<!is_constructible<_Tp, _ValueType&&>::value, |
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bool>::type = false> |
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any(_ValueType&& __value) |
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: _M_manager(&_Mgr::_S_manage) |
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{ |
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_Mgr::_S_create(_M_storage, __value); |
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static_assert(is_copy_constructible<_Tp>::value, |
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"The contained object must be CopyConstructible"); |
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} |
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|
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/// Destructor, calls @c clear() |
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~any() { clear(); } |
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|
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// assignments |
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|
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/// Copy the state of another object. |
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any& operator=(const any& __rhs) |
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{ |
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*this = any(__rhs); |
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return *this; |
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} |
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|
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/** |
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* @brief Move assignment operator |
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* |
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* @post @c __rhs.empty() (not guaranteed for other implementations) |
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*/ |
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any& operator=(any&& __rhs) noexcept |
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{ |
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if (__rhs.empty()) |
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clear(); |
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else if (this != &__rhs) |
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{ |
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clear(); |
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_Arg __arg; |
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__arg._M_any = this; |
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__rhs._M_manager(_Op_xfer, &__rhs, &__arg); |
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} |
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return *this; |
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} |
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|
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/// Store a copy of @p __rhs as the contained object. |
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template<typename _ValueType> |
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enable_if_t<!is_same<any, decay_t<_ValueType>>::value, any&> |
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operator=(_ValueType&& __rhs) |
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{ |
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*this = any(std::forward<_ValueType>(__rhs)); |
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return *this; |
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} |
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|
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// modifiers |
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|
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/// If not empty, destroy the contained object. |
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void clear() noexcept |
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{ |
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if (!empty()) |
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{ |
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_M_manager(_Op_destroy, this, nullptr); |
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_M_manager = nullptr; |
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} |
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} |
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|
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/// Exchange state with another object. |
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void swap(any& __rhs) noexcept |
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{ |
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if (empty() && __rhs.empty()) |
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return; |
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|
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if (!empty() && !__rhs.empty()) |
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{ |
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if (this == &__rhs) |
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return; |
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|
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any __tmp; |
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_Arg __arg; |
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__arg._M_any = &__tmp; |
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__rhs._M_manager(_Op_xfer, &__rhs, &__arg); |
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__arg._M_any = &__rhs; |
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_M_manager(_Op_xfer, this, &__arg); |
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__arg._M_any = this; |
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__tmp._M_manager(_Op_xfer, &__tmp, &__arg); |
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} |
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else |
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{ |
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any* __empty = empty() ? this : &__rhs; |
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any* __full = empty() ? &__rhs : this; |
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_Arg __arg; |
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__arg._M_any = __empty; |
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__full->_M_manager(_Op_xfer, __full, &__arg); |
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} |
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} |
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|
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// observers |
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|
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/// Reports whether there is a contained object or not. |
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_GLIBCXX_NODISCARD bool empty() const noexcept { return _M_manager == nullptr; } |
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|
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#if __cpp_rtti |
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/// The @c typeid of the contained object, or @c typeid(void) if empty. |
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const type_info& type() const noexcept |
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{ |
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if (empty()) |
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return typeid(void); |
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_Arg __arg; |
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_M_manager(_Op_get_type_info, this, &__arg); |
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return *__arg._M_typeinfo; |
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} |
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#endif |
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|
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template<typename _Tp> |
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static constexpr bool __is_valid_cast() |
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{ return __or_<is_reference<_Tp>, is_copy_constructible<_Tp>>::value; } |
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|
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private: |
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enum _Op { |
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_Op_access, _Op_get_type_info, _Op_clone, _Op_destroy, _Op_xfer |
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}; |
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|
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union _Arg |
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{ |
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void* _M_obj; |
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const std::type_info* _M_typeinfo; |
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any* _M_any; |
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}; |
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|
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void (*_M_manager)(_Op, const any*, _Arg*); |
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_Storage _M_storage; |
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|
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template<typename _Tp> |
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friend enable_if_t<is_object<_Tp>::value, void*> |
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__any_caster(const any* __any); |
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|
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// Manage in-place contained object. |
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template<typename _Tp> |
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struct _Manager_internal |
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{ |
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static void |
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_S_manage(_Op __which, const any* __anyp, _Arg* __arg); |
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|
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template<typename _Up> |
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static void |
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_S_create(_Storage& __storage, _Up&& __value) |
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{ |
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void* __addr = &__storage._M_buffer; |
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::new (__addr) _Tp(std::forward<_Up>(__value)); |
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} |
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}; |
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|
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// Manage external contained object. |
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template<typename _Tp> |
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struct _Manager_external |
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{ |
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static void |
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_S_manage(_Op __which, const any* __anyp, _Arg* __arg); |
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|
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template<typename _Up> |
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static void |
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_S_create(_Storage& __storage, _Up&& __value) |
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{ |
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__storage._M_ptr = new _Tp(std::forward<_Up>(__value)); |
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} |
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}; |
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}; |
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|
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/// Exchange the states of two @c any objects. |
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inline void swap(any& __x, any& __y) noexcept { __x.swap(__y); } |
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|
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/** |
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* @brief Access the contained object. |
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* |
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* @tparam _ValueType A const-reference or CopyConstructible type. |
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* @param __any The object to access. |
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* @return The contained object. |
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* @throw bad_any_cast If <code> |
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* __any.type() != typeid(remove_reference_t<_ValueType>) |
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* </code> |
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*/ |
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template<typename _ValueType> |
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inline _ValueType any_cast(const any& __any) |
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{ |
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static_assert(any::__is_valid_cast<_ValueType>(), |
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"Template argument must be a reference or CopyConstructible type"); |
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auto __p = any_cast<add_const_t<remove_reference_t<_ValueType>>>(&__any); |
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if (__p) |
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return *__p; |
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__throw_bad_any_cast(); |
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} |
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|
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/** |
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* @brief Access the contained object. |
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* |
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* @tparam _ValueType A reference or CopyConstructible type. |
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* @param __any The object to access. |
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* @return The contained object. |
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* @throw bad_any_cast If <code> |
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* __any.type() != typeid(remove_reference_t<_ValueType>) |
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* </code> |
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* |
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* @{ |
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*/ |
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template<typename _ValueType> |
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inline _ValueType any_cast(any& __any) |
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{ |
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static_assert(any::__is_valid_cast<_ValueType>(), |
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"Template argument must be a reference or CopyConstructible type"); |
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auto __p = any_cast<remove_reference_t<_ValueType>>(&__any); |
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if (__p) |
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return *__p; |
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__throw_bad_any_cast(); |
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} |
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|
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template<typename _ValueType, |
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typename enable_if<!is_move_constructible<_ValueType>::value |
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|| is_lvalue_reference<_ValueType>::value, |
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bool>::type = true> |
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inline _ValueType any_cast(any&& __any) |
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{ |
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static_assert(any::__is_valid_cast<_ValueType>(), |
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"Template argument must be a reference or CopyConstructible type"); |
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auto __p = any_cast<remove_reference_t<_ValueType>>(&__any); |
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if (__p) |
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return *__p; |
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__throw_bad_any_cast(); |
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} |
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|
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template<typename _ValueType, |
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typename enable_if<is_move_constructible<_ValueType>::value |
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&& !is_lvalue_reference<_ValueType>::value, |
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bool>::type = false> |
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inline _ValueType any_cast(any&& __any) |
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{ |
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static_assert(any::__is_valid_cast<_ValueType>(), |
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"Template argument must be a reference or CopyConstructible type"); |
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auto __p = any_cast<remove_reference_t<_ValueType>>(&__any); |
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if (__p) |
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return std::move(*__p); |
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__throw_bad_any_cast(); |
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} |
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/// @} |
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|
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/// @cond undocumented |
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template<typename _Tp> |
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enable_if_t<is_object<_Tp>::value, void*> |
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__any_caster(const any* __any) |
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{ |
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// any_cast<T> returns non-null if __any->type() == typeid(T) and |
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// typeid(T) ignores cv-qualifiers so remove them: |
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using _Up = remove_cv_t<_Tp>; |
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// The contained value has a decayed type, so if decay_t<U> is not U, |
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// then it's not possible to have a contained value of type U. |
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using __does_not_decay = is_same<decay_t<_Up>, _Up>; |
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// Only copy constructible types can be used for contained values. |
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using __is_copyable = is_copy_constructible<_Up>; |
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// If the type _Tp could never be stored in an any we don't want to |
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// instantiate _Manager<_Tp>, so use _Manager<any::_Op> instead, which |
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// is explicitly specialized and has a no-op _S_manage function. |
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using _Vp = conditional_t<__and_<__does_not_decay, __is_copyable>::value, |
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_Up, any::_Op>; |
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// First try comparing function addresses, which works without RTTI |
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if (__any->_M_manager == &any::_Manager<_Vp>::_S_manage |
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#if __cpp_rtti |
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|| __any->type() == typeid(_Tp) |
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#endif |
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) |
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{ |
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any::_Arg __arg; |
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__any->_M_manager(any::_Op_access, __any, &__arg); |
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return __arg._M_obj; |
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} |
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return nullptr; |
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} |
| 448 |
|
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// This overload exists so that std::any_cast<void(*)()>(a) is well-formed. |
| 450 |
template<typename _Tp> |
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enable_if_t<!is_object<_Tp>::value, _Tp*> |
| 452 |
__any_caster(const any*) noexcept |
| 453 |
{ return nullptr; } |
| 454 |
/// @endcond |
| 455 |
|
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/** |
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* @brief Access the contained object. |
| 458 |
* |
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* @tparam _ValueType The type of the contained object. |
| 460 |
* @param __any A pointer to the object to access. |
| 461 |
* @return The address of the contained object if <code> |
| 462 |
* __any != nullptr && __any.type() == typeid(_ValueType) |
| 463 |
* </code>, otherwise a null pointer. |
| 464 |
* |
| 465 |
* @{ |
| 466 |
*/ |
| 467 |
template<typename _ValueType> |
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inline const _ValueType* any_cast(const any* __any) noexcept |
| 469 |
{ |
| 470 |
if (__any) |
| 471 |
return static_cast<_ValueType*>(__any_caster<_ValueType>(__any)); |
| 472 |
return nullptr; |
| 473 |
} |
| 474 |
|
| 475 |
template<typename _ValueType> |
| 476 |
inline _ValueType* any_cast(any* __any) noexcept |
| 477 |
{ |
| 478 |
if (__any) |
| 479 |
return static_cast<_ValueType*>(__any_caster<_ValueType>(__any)); |
| 480 |
return nullptr; |
| 481 |
} |
| 482 |
/// @} |
| 483 |
|
| 484 |
template<typename _Tp> |
| 485 |
void |
| 486 |
any::_Manager_internal<_Tp>:: |
| 487 |
_S_manage(_Op __which, const any* __any, _Arg* __arg) |
| 488 |
{ |
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// The contained object is in _M_storage._M_buffer |
| 490 |
auto __ptr = reinterpret_cast<const _Tp*>(&__any->_M_storage._M_buffer); |
| 491 |
switch (__which) |
| 492 |
{ |
| 493 |
case _Op_access: |
| 494 |
__arg->_M_obj = const_cast<_Tp*>(__ptr); |
| 495 |
break; |
| 496 |
case _Op_get_type_info: |
| 497 |
#if __cpp_rtti |
| 498 |
__arg->_M_typeinfo = &typeid(_Tp); |
| 499 |
#endif |
| 500 |
break; |
| 501 |
case _Op_clone: |
| 502 |
::new(&__arg->_M_any->_M_storage._M_buffer) _Tp(*__ptr); |
| 503 |
__arg->_M_any->_M_manager = __any->_M_manager; |
| 504 |
break; |
| 505 |
case _Op_destroy: |
| 506 |
__ptr->~_Tp(); |
| 507 |
break; |
| 508 |
case _Op_xfer: |
| 509 |
::new(&__arg->_M_any->_M_storage._M_buffer) _Tp |
| 510 |
(std::move(*const_cast<_Tp*>(__ptr))); |
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__ptr->~_Tp(); |
| 512 |
__arg->_M_any->_M_manager = __any->_M_manager; |
| 513 |
const_cast<any*>(__any)->_M_manager = nullptr; |
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break; |
| 515 |
} |
| 516 |
} |
| 517 |
|
| 518 |
template<typename _Tp> |
| 519 |
void |
| 520 |
any::_Manager_external<_Tp>:: |
| 521 |
_S_manage(_Op __which, const any* __any, _Arg* __arg) |
| 522 |
{ |
| 523 |
// The contained object is *_M_storage._M_ptr |
| 524 |
auto __ptr = static_cast<const _Tp*>(__any->_M_storage._M_ptr); |
| 525 |
switch (__which) |
| 526 |
{ |
| 527 |
case _Op_access: |
| 528 |
__arg->_M_obj = const_cast<_Tp*>(__ptr); |
| 529 |
break; |
| 530 |
case _Op_get_type_info: |
| 531 |
#if __cpp_rtti |
| 532 |
__arg->_M_typeinfo = &typeid(_Tp); |
| 533 |
#endif |
| 534 |
break; |
| 535 |
case _Op_clone: |
| 536 |
__arg->_M_any->_M_storage._M_ptr = new _Tp(*__ptr); |
| 537 |
__arg->_M_any->_M_manager = __any->_M_manager; |
| 538 |
break; |
| 539 |
case _Op_destroy: |
| 540 |
delete __ptr; |
| 541 |
break; |
| 542 |
case _Op_xfer: |
| 543 |
__arg->_M_any->_M_storage._M_ptr = __any->_M_storage._M_ptr; |
| 544 |
__arg->_M_any->_M_manager = __any->_M_manager; |
| 545 |
const_cast<any*>(__any)->_M_manager = nullptr; |
| 546 |
break; |
| 547 |
} |
| 548 |
} |
| 549 |
|
| 550 |
// Dummy specialization used by __any_caster. |
| 551 |
template<> |
| 552 |
struct any::_Manager_internal<any::_Op> |
| 553 |
{ |
| 554 |
static void |
| 555 |
_S_manage(_Op, const any*, _Arg*) { } |
| 556 |
}; |
| 557 |
|
| 558 |
/// @} group any |
| 559 |
} // namespace fundamentals_v1 |
| 560 |
} // namespace experimental |
| 561 |
|
| 562 |
_GLIBCXX_END_NAMESPACE_VERSION |
| 563 |
} // namespace std |
| 564 |
|
| 565 |
#endif // C++14 |
| 566 |
|
| 567 |
#endif // _GLIBCXX_EXPERIMENTAL_ANY |
