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// <bits/enable_special_members.h> -*- C++ -*- |
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// Copyright (C) 2013-2021 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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/** @file bits/enable_special_members.h |
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* This is an internal header file, included by other library headers. |
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* Do not attempt to use it directly. |
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*/ |
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#ifndef _ENABLE_SPECIAL_MEMBERS_H |
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#define _ENABLE_SPECIAL_MEMBERS_H 1 |
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#pragma GCC system_header |
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#include <bits/c++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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struct _Enable_default_constructor_tag |
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{ |
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explicit constexpr _Enable_default_constructor_tag() = default; |
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}; |
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|
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/** |
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* @brief A mixin helper to conditionally enable or disable the default |
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* constructor. |
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* @sa _Enable_special_members |
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*/ |
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template<bool _Switch, typename _Tag = void> |
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struct _Enable_default_constructor |
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{ |
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constexpr _Enable_default_constructor() noexcept = default; |
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constexpr _Enable_default_constructor(_Enable_default_constructor const&) |
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noexcept = default; |
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constexpr _Enable_default_constructor(_Enable_default_constructor&&) |
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noexcept = default; |
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_Enable_default_constructor& |
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operator=(_Enable_default_constructor const&) noexcept = default; |
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_Enable_default_constructor& |
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operator=(_Enable_default_constructor&&) noexcept = default; |
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|
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// Can be used in other ctors. |
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constexpr explicit |
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_Enable_default_constructor(_Enable_default_constructor_tag) { } |
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}; |
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|
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/** |
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* @brief A mixin helper to conditionally enable or disable the default |
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* destructor. |
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* @sa _Enable_special_members |
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*/ |
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template<bool _Switch, typename _Tag = void> |
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struct _Enable_destructor { }; |
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|
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/** |
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* @brief A mixin helper to conditionally enable or disable the copy/move |
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* special members. |
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* @sa _Enable_special_members |
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*/ |
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template<bool _Copy, bool _CopyAssignment, |
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bool _Move, bool _MoveAssignment, |
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typename _Tag = void> |
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struct _Enable_copy_move { }; |
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|
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/** |
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* @brief A mixin helper to conditionally enable or disable the special |
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* members. |
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* |
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* The @c _Tag type parameter is to make mixin bases unique and thus avoid |
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* ambiguities. |
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*/ |
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template<bool _Default, bool _Destructor, |
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bool _Copy, bool _CopyAssignment, |
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bool _Move, bool _MoveAssignment, |
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typename _Tag = void> |
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struct _Enable_special_members |
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: private _Enable_default_constructor<_Default, _Tag>, |
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private _Enable_destructor<_Destructor, _Tag>, |
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private _Enable_copy_move<_Copy, _CopyAssignment, |
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_Move, _MoveAssignment, |
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_Tag> |
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{ }; |
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|
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// Boilerplate follows. |
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|
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template<typename _Tag> |
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struct _Enable_default_constructor<false, _Tag> |
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{ |
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constexpr _Enable_default_constructor() noexcept = delete; |
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constexpr _Enable_default_constructor(_Enable_default_constructor const&) |
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noexcept = default; |
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constexpr _Enable_default_constructor(_Enable_default_constructor&&) |
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noexcept = default; |
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_Enable_default_constructor& |
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operator=(_Enable_default_constructor const&) noexcept = default; |
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_Enable_default_constructor& |
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operator=(_Enable_default_constructor&&) noexcept = default; |
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|
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// Can be used in other ctors. |
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constexpr explicit |
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_Enable_default_constructor(_Enable_default_constructor_tag) { } |
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}; |
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template<typename _Tag> |
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struct _Enable_destructor<false, _Tag> |
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{ ~_Enable_destructor() noexcept = delete; }; |
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|
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template<typename _Tag> |
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struct _Enable_copy_move<false, true, true, true, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = default; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<true, false, true, true, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = default; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<false, false, true, true, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = default; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<true, true, false, true, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = default; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<false, true, false, true, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = default; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<true, false, false, true, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = default; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<false, false, false, true, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = default; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<true, true, true, false, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = delete; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<false, true, true, false, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = delete; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<true, false, true, false, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = delete; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<false, false, true, false, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = delete; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<true, true, false, false, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = delete; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<false, true, false, false, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = default; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = delete; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<true, false, false, false, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = delete; |
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}; |
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template<typename _Tag> |
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struct _Enable_copy_move<false, false, false, false, _Tag> |
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{ |
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constexpr _Enable_copy_move() noexcept = default; |
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constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; |
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constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move const&) noexcept = delete; |
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_Enable_copy_move& |
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operator=(_Enable_copy_move&&) noexcept = delete; |
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}; |
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace std |
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#endif // _ENABLE_SPECIAL_MEMBERS_H |
