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256 lines
5.9 KiB
C++
256 lines
5.9 KiB
C++
// <experimental/memory> -*- C++ -*-
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// Copyright (C) 2015-2019 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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// 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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// 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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// 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 experimental/memory
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* This is a TS C++ Library header.
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*/
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//
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// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
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//
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#ifndef _GLIBCXX_EXPERIMENTAL_MEMORY
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#define _GLIBCXX_EXPERIMENTAL_MEMORY 1
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#pragma GCC system_header
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#if __cplusplus >= 201402L
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#include <memory>
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#include <type_traits>
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#include <utility>
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#include <experimental/bits/shared_ptr.h>
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#include <bits/functional_hash.h>
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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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namespace experimental
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{
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inline namespace fundamentals_v2
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{
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#define __cpp_lib_experimental_observer_ptr 201411
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template <typename _Tp>
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class observer_ptr
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{
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public:
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// publish our template parameter and variations thereof
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using element_type = _Tp;
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using __pointer = add_pointer_t<_Tp>; // exposition-only
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using __reference = add_lvalue_reference_t<_Tp>; // exposition-only
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// 3.2.2, observer_ptr constructors
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// default c'tor
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constexpr observer_ptr() noexcept
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: __t()
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{ }
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// pointer-accepting c'tors
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constexpr observer_ptr(nullptr_t) noexcept
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: __t()
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{ }
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constexpr explicit observer_ptr(__pointer __p) noexcept
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: __t(__p)
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{ }
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// copying c'tors (in addition to compiler-generated copy c'tor)
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template <typename _Up,
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typename = typename enable_if<
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is_convertible<typename add_pointer<_Up>::type, __pointer
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>::value
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>::type>
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constexpr observer_ptr(observer_ptr<_Up> __p) noexcept
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: __t(__p.get())
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{
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}
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// 3.2.3, observer_ptr observers
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constexpr __pointer
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get() const noexcept
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{
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return __t;
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}
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constexpr __reference
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operator*() const
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{
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return *get();
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}
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constexpr __pointer
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operator->() const noexcept
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{
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return get();
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}
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constexpr explicit operator bool() const noexcept
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{
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return get() != nullptr;
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}
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// 3.2.4, observer_ptr conversions
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constexpr explicit operator __pointer() const noexcept
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{
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return get();
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}
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// 3.2.5, observer_ptr modifiers
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constexpr __pointer
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release() noexcept
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{
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__pointer __tmp = get();
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reset();
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return __tmp;
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}
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constexpr void
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reset(__pointer __p = nullptr) noexcept
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{
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__t = __p;
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}
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constexpr void
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swap(observer_ptr& __p) noexcept
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{
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std::swap(__t, __p.__t);
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}
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private:
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__pointer __t;
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}; // observer_ptr<>
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template<typename _Tp>
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void
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swap(observer_ptr<_Tp>& __p1, observer_ptr<_Tp>& __p2) noexcept
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{
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__p1.swap(__p2);
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}
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template<typename _Tp>
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observer_ptr<_Tp>
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make_observer(_Tp* __p) noexcept
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{
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return observer_ptr<_Tp>(__p);
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}
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template<typename _Tp, typename _Up>
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bool
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operator==(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
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{
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return __p1.get() == __p2.get();
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}
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template<typename _Tp, typename _Up>
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bool
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operator!=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
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{
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return !(__p1 == __p2);
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}
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template<typename _Tp>
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bool
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operator==(observer_ptr<_Tp> __p, nullptr_t) noexcept
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{
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return !__p;
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}
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template<typename _Tp>
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bool
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operator==(nullptr_t, observer_ptr<_Tp> __p) noexcept
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{
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return !__p;
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}
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template<typename _Tp>
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bool
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operator!=(observer_ptr<_Tp> __p, nullptr_t) noexcept
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{
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return bool(__p);
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}
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template<typename _Tp>
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bool
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operator!=(nullptr_t, observer_ptr<_Tp> __p) noexcept
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{
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return bool(__p);
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}
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template<typename _Tp, typename _Up>
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bool
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operator<(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
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{
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return std::less<typename common_type<typename add_pointer<_Tp>::type,
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typename add_pointer<_Up>::type
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>::type
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>{}(__p1.get(), __p2.get());
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}
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template<typename _Tp, typename _Up>
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bool
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operator>(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
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{
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return __p2 < __p1;
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}
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template<typename _Tp, typename _Up>
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bool
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operator<=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
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{
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return !(__p2 < __p1);
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}
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template<typename _Tp, typename _Up>
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bool
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operator>=(observer_ptr<_Tp> __p1, observer_ptr<_Up> __p2)
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{
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return !(__p1 < __p2);
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}
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} // namespace fundamentals_v2
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} // namespace experimental
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template <typename _Tp>
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struct hash<experimental::observer_ptr<_Tp>>
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{
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using result_type = size_t;
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using argument_type = experimental::observer_ptr<_Tp>;
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size_t
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operator()(const experimental::observer_ptr<_Tp>& __t) const
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noexcept(noexcept(hash<typename add_pointer<_Tp>::type> {}(__t.get())))
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{
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return hash<typename add_pointer<_Tp>::type> {}(__t.get());
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}
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif // __cplusplus <= 201103L
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#endif // _GLIBCXX_EXPERIMENTAL_MEMORY
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