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// <experimental/propagate_const> -*- C++ -*- |
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// Copyright (C) 2015-2021 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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|
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/** @file experimental/propagate_const |
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* This is a TS C++ Library header. |
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* @ingroup libfund-ts |
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*/ |
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|
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#ifndef _GLIBCXX_EXPERIMENTAL_PROPAGATE_CONST |
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#define _GLIBCXX_EXPERIMENTAL_PROPAGATE_CONST 1 |
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|
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#pragma GCC system_header |
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|
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#if __cplusplus >= 201402L |
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|
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#include <type_traits> |
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#include <bits/functional_hash.h> |
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#include <bits/move.h> |
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#include <bits/stl_function.h> |
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#include <experimental/bits/lfts_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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namespace experimental |
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{ |
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inline namespace fundamentals_v2 |
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{ |
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/** |
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* @defgroup propagate_const Const-propagating wrapper |
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* @ingroup libfund-ts |
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* |
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* A const-propagating wrapper that propagates const to pointer-like members, |
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* as described in n4388 "A Proposal to Add a Const-Propagating Wrapper |
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* to the Standard Library". |
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* |
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* @{ |
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*/ |
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|
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/// Const-propagating wrapper. |
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template <typename _Tp> |
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class propagate_const |
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{ |
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public: |
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typedef remove_reference_t<decltype(*std::declval<_Tp&>())> element_type; |
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|
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private: |
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template <typename _Up> |
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struct __is_propagate_const : false_type |
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{ }; |
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|
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template <typename _Up> |
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struct __is_propagate_const<propagate_const<_Up>> : true_type |
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{ }; |
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|
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template <typename _Up> |
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friend constexpr const _Up& |
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get_underlying(const propagate_const<_Up>& __pt) noexcept; |
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template <typename _Up> |
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friend constexpr _Up& |
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get_underlying(propagate_const<_Up>& __pt) noexcept; |
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|
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template <typename _Up> |
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static constexpr element_type* |
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__to_raw_pointer(_Up* __u) |
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{ return __u; } |
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|
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template <typename _Up> |
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static constexpr element_type* |
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__to_raw_pointer(_Up& __u) |
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{ return __u.get(); } |
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|
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template <typename _Up> |
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static constexpr const element_type* |
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__to_raw_pointer(const _Up* __u) |
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{ return __u; } |
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|
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template <typename _Up> |
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static constexpr const element_type* |
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__to_raw_pointer(const _Up& __u) |
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{ return __u.get(); } |
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|
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public: |
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static_assert(__and_<is_object<typename remove_pointer<_Tp>::type>, |
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__not_<is_array<_Tp>>, |
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__or_<is_class<_Tp>, is_pointer<_Tp>>>::value, |
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"propagate_const requires a class or a pointer to an" |
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" object type"); |
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|
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// [propagate_const.ctor], constructors |
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constexpr propagate_const() = default; |
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propagate_const(const propagate_const& __p) = delete; |
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constexpr propagate_const(propagate_const&& __p) = default; |
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|
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template <typename _Up, typename |
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enable_if<__and_<is_constructible<_Tp, _Up&&>, |
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is_convertible<_Up&&, _Tp>>::value, bool |
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>::type=true> |
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constexpr propagate_const(propagate_const<_Up>&& __pu) |
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: _M_t(std::move(get_underlying(__pu))) |
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{} |
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template <typename _Up, typename |
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enable_if<__and_<is_constructible<_Tp, _Up&&>, |
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__not_<is_convertible<_Up&&, _Tp>>>::value, |
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bool>::type=false> |
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constexpr explicit propagate_const(propagate_const<_Up>&& __pu) |
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: _M_t(std::move(get_underlying(__pu))) |
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{} |
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template <typename _Up, typename |
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enable_if<__and_<is_constructible<_Tp, _Up&&>, |
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is_convertible<_Up&&, _Tp>, |
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__not_<__is_propagate_const< |
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typename decay<_Up>::type>> |
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>::value, bool>::type=true> |
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constexpr propagate_const(_Up&& __u) |
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: _M_t(std::forward<_Up>(__u)) |
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{} |
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|
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template <typename _Up, typename |
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enable_if<__and_<is_constructible<_Tp, _Up&&>, |
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__not_<is_convertible<_Up&&, _Tp>>, |
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__not_<__is_propagate_const< |
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typename decay<_Up>::type>> |
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>::value, bool>::type=false> |
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constexpr explicit propagate_const(_Up&& __u) |
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: _M_t(std::forward<_Up>(__u)) |
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{} |
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// [propagate_const.assignment], assignment |
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propagate_const& operator=(const propagate_const& __p) = delete; |
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constexpr propagate_const& operator=(propagate_const&& __p) = default; |
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template <typename _Up, typename = |
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typename enable_if<is_convertible<_Up&&, _Tp>::value>::type> |
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constexpr propagate_const& operator=(propagate_const<_Up>&& __pu) |
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{ |
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_M_t = std::move(get_underlying(__pu)); |
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return *this; |
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} |
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template <typename _Up, typename = |
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typename enable_if<__and_<is_convertible<_Up&&, _Tp>, |
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__not_<__is_propagate_const< |
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typename decay<_Up>::type>> |
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>::value>::type> |
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constexpr propagate_const& operator=(_Up&& __u) |
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{ |
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_M_t = std::forward<_Up>(__u); |
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return *this; |
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} |
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// [propagate_const.const_observers], const observers |
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explicit constexpr operator bool() const |
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{ |
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return bool(_M_t); |
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} |
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constexpr const element_type* operator->() const |
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{ |
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return get(); |
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} |
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template <typename _Up = _Tp, |
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typename enable_if<__or_<is_pointer<_Up>, |
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is_convertible<_Up, |
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const element_type*> |
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>::value, bool>::type = true> |
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constexpr operator const element_type*() const |
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{ |
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return get(); |
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} |
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constexpr const element_type& operator*() const |
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{ |
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return *get(); |
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} |
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|
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constexpr const element_type* get() const |
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{ |
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return __to_raw_pointer(_M_t); |
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} |
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// [propagate_const.non_const_observers], non-const observers |
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constexpr element_type* operator->() |
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{ |
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return get(); |
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} |
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template <typename _Up = _Tp, |
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typename enable_if<__or_<is_pointer<_Up>, |
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is_convertible<_Up, |
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const element_type*> |
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>::value, bool>::type = true> |
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constexpr operator element_type*() |
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{ |
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return get(); |
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} |
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|
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constexpr element_type& operator*() |
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{ |
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return *get(); |
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} |
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constexpr element_type* get() |
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{ |
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return __to_raw_pointer(_M_t); |
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} |
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// [propagate_const.modifiers], modifiers |
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constexpr void |
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swap(propagate_const& __pt) noexcept(__is_nothrow_swappable<_Tp>::value) |
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{ |
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using std::swap; |
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swap(_M_t, get_underlying(__pt)); |
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} |
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private: |
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_Tp _M_t; |
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}; |
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|
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// [propagate_const.relational], relational operators |
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template <typename _Tp> |
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constexpr bool |
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operator==(const propagate_const<_Tp>& __pt, nullptr_t) |
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{ |
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return get_underlying(__pt) == nullptr; |
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} |
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|
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template <typename _Tp> |
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constexpr bool |
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operator==(nullptr_t, const propagate_const<_Tp>& __pu) |
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{ |
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return nullptr == get_underlying(__pu); |
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} |
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|
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template <typename _Tp> |
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constexpr bool |
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operator!=(const propagate_const<_Tp>& __pt, nullptr_t) |
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{ |
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return get_underlying(__pt) != nullptr; |
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} |
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template <typename _Tp> |
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constexpr bool operator!=(nullptr_t, const propagate_const<_Tp>& __pu) |
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{ |
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return nullptr != get_underlying(__pu); |
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} |
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator==(const propagate_const<_Tp>& __pt, |
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const propagate_const<_Up>& __pu) |
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{ |
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return get_underlying(__pt) == get_underlying(__pu); |
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} |
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator!=(const propagate_const<_Tp>& __pt, |
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const propagate_const<_Up>& __pu) |
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{ |
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return get_underlying(__pt) != get_underlying(__pu); |
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} |
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator<(const propagate_const<_Tp>& __pt, |
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const propagate_const<_Up>& __pu) |
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{ |
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return get_underlying(__pt) < get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator>(const propagate_const<_Tp>& __pt, |
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const propagate_const<_Up>& __pu) |
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{ |
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return get_underlying(__pt) > get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator<=(const propagate_const<_Tp>& __pt, |
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const propagate_const<_Up>& __pu) |
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{ |
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return get_underlying(__pt) <= get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator>=(const propagate_const<_Tp>& __pt, |
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const propagate_const<_Up>& __pu) |
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{ |
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return get_underlying(__pt) >= get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator==(const propagate_const<_Tp>& __pt, const _Up& __u) |
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{ |
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return get_underlying(__pt) == __u; |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator!=(const propagate_const<_Tp>& __pt, const _Up& __u) |
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{ |
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return get_underlying(__pt) != __u; |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator<(const propagate_const<_Tp>& __pt, const _Up& __u) |
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{ |
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return get_underlying(__pt) < __u; |
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} |
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator>(const propagate_const<_Tp>& __pt, const _Up& __u) |
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{ |
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return get_underlying(__pt) > __u; |
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} |
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator<=(const propagate_const<_Tp>& __pt, const _Up& __u) |
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{ |
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return get_underlying(__pt) <= __u; |
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} |
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator>=(const propagate_const<_Tp>& __pt, const _Up& __u) |
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{ |
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return get_underlying(__pt) >= __u; |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator==(const _Tp& __t, const propagate_const<_Up>& __pu) |
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{ |
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return __t == get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator!=(const _Tp& __t, const propagate_const<_Up>& __pu) |
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{ |
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return __t != get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator<(const _Tp& __t, const propagate_const<_Up>& __pu) |
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{ |
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return __t < get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator>(const _Tp& __t, const propagate_const<_Up>& __pu) |
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{ |
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return __t > get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator<=(const _Tp& __t, const propagate_const<_Up>& __pu) |
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{ |
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return __t <= get_underlying(__pu); |
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} |
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|
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template <typename _Tp, typename _Up> |
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constexpr bool |
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operator>=(const _Tp& __t, const propagate_const<_Up>& __pu) |
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{ |
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return __t >= get_underlying(__pu); |
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} |
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|
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// [propagate_const.algorithms], specialized algorithms |
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 3413. propagate_const's swap [...] needs to be constrained and use a trait |
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template <typename _Tp> |
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constexpr enable_if_t<__is_swappable<_Tp>::value, void> |
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swap(propagate_const<_Tp>& __pt, propagate_const<_Tp>& __pt2) |
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noexcept(__is_nothrow_swappable<_Tp>::value) |
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{ |
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__pt.swap(__pt2); |
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} |
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|
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// [propagate_const.underlying], underlying pointer access |
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template <typename _Tp> |
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constexpr const _Tp& |
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get_underlying(const propagate_const<_Tp>& __pt) noexcept |
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{ |
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return __pt._M_t; |
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} |
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|
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template <typename _Tp> |
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constexpr _Tp& |
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get_underlying(propagate_const<_Tp>& __pt) noexcept |
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{ |
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return __pt._M_t; |
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} |
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|
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/// @} group propagate_const |
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} // namespace fundamentals_v2 |
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} // namespace experimental |
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|
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// [propagate_const.hash], hash support |
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template <typename _Tp> |
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struct hash<experimental::propagate_const<_Tp>> |
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{ |
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using result_type = size_t; |
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using argument_type = experimental::propagate_const<_Tp>; |
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|
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size_t |
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operator()(const experimental::propagate_const<_Tp>& __t) const |
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noexcept(noexcept(hash<_Tp>{}(get_underlying(__t)))) |
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{ |
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return hash<_Tp>{}(get_underlying(__t)); |
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} |
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}; |
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|
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// [propagate_const.comparison_function_objects], comparison function objects |
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template <typename _Tp> |
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struct equal_to<experimental::propagate_const<_Tp>> |
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{ |
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constexpr bool |
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operator()(const experimental::propagate_const<_Tp>& __x, |
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const experimental::propagate_const<_Tp>& __y) const |
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{ |
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return equal_to<_Tp>{}(get_underlying(__x), get_underlying(__y)); |
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} |
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|
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typedef experimental::propagate_const<_Tp> first_argument_type; |
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typedef experimental::propagate_const<_Tp> second_argument_type; |
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typedef bool result_type; |
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}; |
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|
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template <typename _Tp> |
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struct not_equal_to<experimental::propagate_const<_Tp>> |
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{ |
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constexpr bool |
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operator()(const experimental::propagate_const<_Tp>& __x, |
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const experimental::propagate_const<_Tp>& __y) const |
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{ |
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return not_equal_to<_Tp>{}(get_underlying(__x), get_underlying(__y)); |
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} |
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|
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typedef experimental::propagate_const<_Tp> first_argument_type; |
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typedef experimental::propagate_const<_Tp> second_argument_type; |
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typedef bool result_type; |
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}; |
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|
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template <typename _Tp> |
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struct less<experimental::propagate_const<_Tp>> |
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{ |
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constexpr bool |
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operator()(const experimental::propagate_const<_Tp>& __x, |
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const experimental::propagate_const<_Tp>& __y) const |
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{ |
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return less<_Tp>{}(get_underlying(__x), get_underlying(__y)); |
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} |
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|
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typedef experimental::propagate_const<_Tp> first_argument_type; |
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typedef experimental::propagate_const<_Tp> second_argument_type; |
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typedef bool result_type; |
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}; |
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|
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template <typename _Tp> |
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struct greater<experimental::propagate_const<_Tp>> |
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{ |
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constexpr bool |
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operator()(const experimental::propagate_const<_Tp>& __x, |
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const experimental::propagate_const<_Tp>& __y) const |
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{ |
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return greater<_Tp>{}(get_underlying(__x), get_underlying(__y)); |
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} |
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|
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typedef experimental::propagate_const<_Tp> first_argument_type; |
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typedef experimental::propagate_const<_Tp> second_argument_type; |
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typedef bool result_type; |
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}; |
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|
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template <typename _Tp> |
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struct less_equal<experimental::propagate_const<_Tp>> |
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{ |
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constexpr bool |
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operator()(const experimental::propagate_const<_Tp>& __x, |
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const experimental::propagate_const<_Tp>& __y) const |
| 517 |
{ |
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return less_equal<_Tp>{}(get_underlying(__x), get_underlying(__y)); |
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} |
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|
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typedef experimental::propagate_const<_Tp> first_argument_type; |
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typedef experimental::propagate_const<_Tp> second_argument_type; |
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typedef bool result_type; |
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}; |
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|
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template <typename _Tp> |
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struct greater_equal<experimental::propagate_const<_Tp>> |
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{ |
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constexpr bool |
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operator()(const experimental::propagate_const<_Tp>& __x, |
| 531 |
const experimental::propagate_const<_Tp>& __y) const |
| 532 |
{ |
| 533 |
return greater_equal<_Tp>{}(get_underlying(__x), get_underlying(__y)); |
| 534 |
} |
| 535 |
|
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typedef experimental::propagate_const<_Tp> first_argument_type; |
| 537 |
typedef experimental::propagate_const<_Tp> second_argument_type; |
| 538 |
typedef bool result_type; |
| 539 |
}; |
| 540 |
|
| 541 |
_GLIBCXX_END_NAMESPACE_VERSION |
| 542 |
} // namespace std |
| 543 |
|
| 544 |
#endif // C++14 |
| 545 |
|
| 546 |
#endif // _GLIBCXX_EXPERIMENTAL_PROPAGATE_CONST |
