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EDIT: memory
// <experimental/memory> -*- C++ -*- // Copyright (C) 2015-2018 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 experimental/memory * This is a TS C++ Library header. */ // // N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2 // #ifndef _GLIBCXX_EXPERIMENTAL_MEMORY #define _GLIBCXX_EXPERIMENTAL_MEMORY 1 #pragma GCC system_header #if __cplusplus >= 201402L #include <memory> #include <type_traits> #include <utility> #include <experimental/bits/shared_ptr.h> #include <bits/functional_hash.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace experimental { inline namespace fundamentals_v2 { #define __cpp_lib_experimental_observer_ptr 201411 template <typename _Tp> class observer_ptr { public: // publish our template parameter and variations thereof using element_type = _Tp; using __pointer = add_pointer_t<_Tp>; // exposition-only using __reference = add_lvalue_reference_t<_Tp>; // exposition-only // 3.2.2, observer_ptr constructors // default cβtor constexpr observer_ptr() noexcept : __t() { } // pointer-accepting cβtors constexpr observer_ptr(nullptr_t) noexcept : __t() { } constexpr explicit observer_ptr(__pointer __p) noexcept : __t(__p) { } // copying cβtors (in addition to compiler-generated copy cβtor) template <typename _Up, typename = typename enable_if< is_convertible<typename add_pointer<_Up>::type, __pointer >::value >::type> constexpr observer_ptr(observer_ptr<_Up> __p) noexcept : __t(__p.get()) { } // 3.2.3, observer_ptr observers constexpr __pointer get() const noexcept { return __t; } constexpr __reference operator*() const { return *get(); } constexpr __pointer operator->() const noexcept { return get(); } constexpr explicit operator bool() const noexcept { return get() != nullptr; } // 3.2.4, observer_ptr conversions constexpr explicit operator __pointer() const noexcept { return get(); } // 3.2.5, observer_ptr modifiers constexpr __pointer release() noexcept { __pointer __tmp = get(); reset(); return __tmp; } constexpr void reset(__pointer __p = nullptr) noexcept { __t = __p; } constexpr void swap(observer_ptr& __p) noexcept { std::swap(__t, __p.__t); } private: __pointer __t; }; // observer_ptr<> template<typename _Tp> void swap(observer_ptr<_Tp>& __p1, observer_ptr<_Tp>& __p2) noexcept { __p1.swap(__p2); } template<typename _Tp> observer_ptr<_Tp> make_observer(_Tp* __p) noexcept { return observer_ptr<_Tp>(__p); } template<typename _Tp, typename _Up> bool operator==(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2) { return __p1.get() == __p2.get(); } template<typename _Tp, typename _Up> bool operator!=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2) { return !(__p1 == __p2); } template<typename _Tp> bool operator==(observer_ptr<_Tp> __p, nullptr_t) noexcept { return !__p; } template<typename _Tp> bool operator==(nullptr_t, observer_ptr<_Tp> __p) noexcept { return !__p; } template<typename _Tp> bool operator!=(observer_ptr<_Tp> __p, nullptr_t) noexcept { return bool(__p); } template<typename _Tp> bool operator!=(nullptr_t, observer_ptr<_Tp> __p) noexcept { return bool(__p); } template<typename _Tp, typename _Up> bool operator<(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2) { return std::less<typename common_type<typename add_pointer<_Tp>::type, typename add_pointer<_Up>::type >::type >{}(__p1.get(), __p2.get()); } template<typename _Tp, typename _Up> bool operator>(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2) { return __p2 < __p1; } template<typename _Tp, typename _Up> bool operator<=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2) { return !(__p2 < __p1); } template<typename _Tp, typename _Up> bool operator>=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2) { return !(__p1 < __p2); } } // namespace fundamentals_v2 } // namespace experimental template <typename _Tp> struct hash<experimental::observer_ptr<_Tp>> { using result_type = size_t; using argument_type = experimental::observer_ptr<_Tp>; size_t operator()(const experimental::observer_ptr<_Tp>& __t) const noexcept(noexcept(hash<typename add_pointer<_Tp>::type> {}(__t.get()))) { return hash<typename add_pointer<_Tp>::type> {}(__t.get()); } }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // __cplusplus <= 201103L #endif // _GLIBCXX_EXPERIMENTAL_MEMORY