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enable_special_members.h
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// <bits/enable_special_members.h> -*- C++ -*- // Copyright (C) 2013-2018 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 namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION 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; }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // _ENABLE_SPECIAL_MEMBERS_H
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