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- // <bits/enable_special_members.h> -*- C++ -*-
- // Copyright (C) 2013-2022 Free Software Foundation, Inc.
- //
- // This file is part of the GNU ISO C++ Library. This library is free
- // software; you can redistribute it and/or modify it under the
- // terms of the GNU General Public License as published by the
- // Free Software Foundation; either version 3, or (at your option)
- // any later version.
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // Under Section 7 of GPL version 3, you are granted additional
- // permissions described in the GCC Runtime Library Exception, version
- // 3.1, as published by the Free Software Foundation.
- // You should have received a copy of the GNU General Public License and
- // a copy of the GCC Runtime Library Exception along with this program;
- // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
- // <http://www.gnu.org/licenses/>.
- /** @file bits/enable_special_members.h
- * This is an internal header file, included by other library headers.
- * Do not attempt to use it directly.
- */
- #ifndef _ENABLE_SPECIAL_MEMBERS_H
- #define _ENABLE_SPECIAL_MEMBERS_H 1
- #pragma GCC system_header
- #include <bits/c++config.h>
- namespace std _GLIBCXX_VISIBILITY(default)
- {
- _GLIBCXX_BEGIN_NAMESPACE_VERSION
- /// @cond undocumented
- struct _Enable_default_constructor_tag
- {
- explicit constexpr _Enable_default_constructor_tag() = default;
- };
- /**
- * @brief A mixin helper to conditionally enable or disable the default
- * constructor.
- * @sa _Enable_special_members
- */
- template<bool _Switch, typename _Tag = void>
- struct _Enable_default_constructor
- {
- constexpr _Enable_default_constructor() noexcept = default;
- constexpr _Enable_default_constructor(_Enable_default_constructor const&)
- noexcept = default;
- constexpr _Enable_default_constructor(_Enable_default_constructor&&)
- noexcept = default;
- _Enable_default_constructor&
- operator=(_Enable_default_constructor const&) noexcept = default;
- _Enable_default_constructor&
- operator=(_Enable_default_constructor&&) noexcept = default;
- // Can be used in other ctors.
- constexpr explicit
- _Enable_default_constructor(_Enable_default_constructor_tag) { }
- };
- /**
- * @brief A mixin helper to conditionally enable or disable the default
- * destructor.
- * @sa _Enable_special_members
- */
- template<bool _Switch, typename _Tag = void>
- struct _Enable_destructor { };
- /**
- * @brief A mixin helper to conditionally enable or disable the copy/move
- * special members.
- * @sa _Enable_special_members
- */
- template<bool _Copy, bool _CopyAssignment,
- bool _Move, bool _MoveAssignment,
- typename _Tag = void>
- struct _Enable_copy_move { };
- /**
- * @brief A mixin helper to conditionally enable or disable the special
- * members.
- *
- * The @c _Tag type parameter is to make mixin bases unique and thus avoid
- * ambiguities.
- */
- template<bool _Default, bool _Destructor,
- bool _Copy, bool _CopyAssignment,
- bool _Move, bool _MoveAssignment,
- typename _Tag = void>
- struct _Enable_special_members
- : private _Enable_default_constructor<_Default, _Tag>,
- private _Enable_destructor<_Destructor, _Tag>,
- private _Enable_copy_move<_Copy, _CopyAssignment,
- _Move, _MoveAssignment,
- _Tag>
- { };
- // Boilerplate follows.
- template<typename _Tag>
- struct _Enable_default_constructor<false, _Tag>
- {
- constexpr _Enable_default_constructor() noexcept = delete;
- constexpr _Enable_default_constructor(_Enable_default_constructor const&)
- noexcept = default;
- constexpr _Enable_default_constructor(_Enable_default_constructor&&)
- noexcept = default;
- _Enable_default_constructor&
- operator=(_Enable_default_constructor const&) noexcept = default;
- _Enable_default_constructor&
- operator=(_Enable_default_constructor&&) noexcept = default;
- // Can be used in other ctors.
- constexpr explicit
- _Enable_default_constructor(_Enable_default_constructor_tag) { }
- };
- template<typename _Tag>
- struct _Enable_destructor<false, _Tag>
- { ~_Enable_destructor() noexcept = delete; };
- template<typename _Tag>
- struct _Enable_copy_move<false, true, true, true, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = default;
- };
- template<typename _Tag>
- struct _Enable_copy_move<true, false, true, true, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = default;
- };
- template<typename _Tag>
- struct _Enable_copy_move<false, false, true, true, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = default;
- };
- template<typename _Tag>
- struct _Enable_copy_move<true, true, false, true, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = default;
- };
- template<typename _Tag>
- struct _Enable_copy_move<false, true, false, true, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = default;
- };
- template<typename _Tag>
- struct _Enable_copy_move<true, false, false, true, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = default;
- };
- template<typename _Tag>
- struct _Enable_copy_move<false, false, false, true, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = default;
- };
- template<typename _Tag>
- struct _Enable_copy_move<true, true, true, false, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = delete;
- };
- template<typename _Tag>
- struct _Enable_copy_move<false, true, true, false, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = delete;
- };
- template<typename _Tag>
- struct _Enable_copy_move<true, false, true, false, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = delete;
- };
- template<typename _Tag>
- struct _Enable_copy_move<false, false, true, false, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = delete;
- };
- template<typename _Tag>
- struct _Enable_copy_move<true, true, false, false, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = delete;
- };
- template<typename _Tag>
- struct _Enable_copy_move<false, true, false, false, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = default;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = delete;
- };
- template<typename _Tag>
- struct _Enable_copy_move<true, false, false, false, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = delete;
- };
- template<typename _Tag>
- struct _Enable_copy_move<false, false, false, false, _Tag>
- {
- constexpr _Enable_copy_move() noexcept = default;
- constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete;
- constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move const&) noexcept = delete;
- _Enable_copy_move&
- operator=(_Enable_copy_move&&) noexcept = delete;
- };
- /// @endcond
- _GLIBCXX_END_NAMESPACE_VERSION
- } // namespace std
- #endif // _ENABLE_SPECIAL_MEMBERS_H
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