forked from OSchip/llvm-project
578 lines
20 KiB
C++
578 lines
20 KiB
C++
// -*- C++ -*-
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//===------------------------ propagate_const -----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_EXPERIMENTAL_PROPAGATE_CONST
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#define _LIBCPP_EXPERIMENTAL_PROPAGATE_CONST
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/*
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propagate_const synopsis
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namespace std { namespace experimental { inline namespace fundamentals_v2 {
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// [propagate_const]
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template <class T> class propagate_const;
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// [propagate_const.underlying], underlying pointer access
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constexpr const _Tp& _VSTD_LFTS_V2::get_underlying(const propagate_const<T>& pt) noexcept;
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constexpr T& _VSTD_LFTS_V2::get_underlying(propagate_const<T>& pt) noexcept;
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// [propagate_const.relational], relational operators
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template <class T> constexpr bool operator==(const propagate_const<T>& pt, nullptr_t);
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template <class T> constexpr bool operator==(nullptr_t, const propagate_const<T>& pu);
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template <class T> constexpr bool operator!=(const propagate_const<T>& pt, nullptr_t);
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template <class T> constexpr bool operator!=(nullptr_t, const propagate_const<T>& pu);
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template <class T, class U> constexpr bool operator==(const propagate_const<T>& pt, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator!=(const propagate_const<T>& pt, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator<(const propagate_const<T>& pt, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator>(const propagate_const<T>& pt, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator<=(const propagate_const<T>& pt, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator>=(const propagate_const<T>& pt, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator==(const propagate_const<T>& pt, const _Up& u);
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template <class T, class U> constexpr bool operator!=(const propagate_const<T>& pt, const _Up& u);
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template <class T, class U> constexpr bool operator<(const propagate_const<T>& pt, const _Up& u);
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template <class T, class U> constexpr bool operator>(const propagate_const<T>& pt, const _Up& u);
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template <class T, class U> constexpr bool operator<=(const propagate_const<T>& pt, const _Up& u);
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template <class T, class U> constexpr bool operator>=(const propagate_const<T>& pt, const _Up& u);
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template <class T, class U> constexpr bool operator==(const _Tp& t, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator!=(const _Tp& t, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator<(const _Tp& t, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator>(const _Tp& t, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator<=(const _Tp& t, const propagate_const<_Up>& pu);
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template <class T, class U> constexpr bool operator>=(const _Tp& t, const propagate_const<_Up>& pu);
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// [propagate_const.algorithms], specialized algorithms
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template <class T> constexpr void swap(propagate_const<T>& pt, propagate_const<T>& pu) noexcept(see below);
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template <class T>
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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(*declval<T&>())> element_type;
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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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template <class U> EXPLICIT constexpr propagate_const(propagate_const<_Up>&& pu); // see below
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template <class U> EXPLICIT constexpr propagate_const(U&& u); // see below
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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 <class U> constexpr propagate_const& operator=(propagate_const<_Up>&& pu);
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template <class U> constexpr propagate_const& operator=(U&& u); // see below
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// [propagate_const.const_observers], const observers
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explicit constexpr operator bool() const;
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constexpr const element_type* operator->() const;
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constexpr operator const element_type*() const; // Not always defined
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constexpr const element_type& operator*() const;
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constexpr const element_type* get() const;
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// [propagate_const.non_const_observers], non-const observers
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constexpr element_type* operator->();
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constexpr operator element_type*(); // Not always defined
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constexpr element_type& operator*();
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constexpr element_type* get();
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// [propagate_const.modifiers], modifiers
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constexpr void swap(propagate_const& pt) noexcept(see below)
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private:
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T t_; // exposition only
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};
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} // namespace fundamentals_v2
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} // namespace experimental
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// [propagate_const.hash], hash support
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template <class T> struct hash<experimental::fundamentals_v2::propagate_const<T>>;
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// [propagate_const.comparison_function_objects], comparison function objects
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template <class T> struct equal_to<experimental::fundamentals_v2::propagate_const<T>>;
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template <class T> struct not_equal_to<experimental::fundamentals_v2::propagate_const<T>>;
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template <class T> struct less<experimental::fundamentals_v2::propagate_const<T>>;
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template <class T> struct greater<experimental::fundamentals_v2::propagate_const<T>>;
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template <class T> struct less_equal<experimental::fundamentals_v2::propagate_const<T>>;
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template <class T> struct greater_equal<experimental::fundamentals_v2::propagate_const<T>>;
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} // namespace std
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*/
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#include <experimental/__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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#if _LIBCPP_STD_VER > 11
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#include <type_traits>
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#include <utility>
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#include <functional>
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_LIBCPP_BEGIN_NAMESPACE_LFTS_V2
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template <class _Tp>
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class propagate_const;
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template <class _Up>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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const _Up& get_underlying(const propagate_const<_Up>& __pu) _NOEXCEPT;
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template <class _Up>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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_Up& get_underlying(propagate_const<_Up>& __pu) _NOEXCEPT;
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template <class _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(*declval<_Tp&>())> element_type;
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static_assert(!is_array<_Tp>::value,
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"Instantiation of propagate_const with an array type is ill-formed.");
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static_assert(!is_reference<_Tp>::value,
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"Instantiation of propagate_const with a reference type is ill-formed.");
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static_assert(!(is_pointer<_Tp>::value && is_function<typename remove_pointer<_Tp>::type>::value),
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"Instantiation of propagate_const with a function-pointer type is ill-formed.");
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static_assert(!(is_pointer<_Tp>::value && is_same<typename remove_cv<typename remove_pointer<_Tp>::type>::type, void>::value),
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"Instantiation of propagate_const with a pointer to (possibly cv-qualified) void is ill-formed.");
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private:
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template <class _Up>
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static _LIBCPP_CONSTEXPR element_type* __get_pointer(_Up* __u)
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{
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return __u;
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}
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template <class _Up>
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static _LIBCPP_CONSTEXPR element_type* __get_pointer(_Up& __u)
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{
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return __get_pointer(__u.get());
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}
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template <class _Up>
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static _LIBCPP_CONSTEXPR const element_type* __get_pointer(const _Up* __u)
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{
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return __u;
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}
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template <class _Up>
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static _LIBCPP_CONSTEXPR const element_type* __get_pointer(const _Up& __u)
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{
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return __get_pointer(__u.get());
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}
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template <class _Up>
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struct __is_propagate_const : false_type
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{
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};
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template <class _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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_Tp __t_;
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public:
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template <class _Up> friend _LIBCPP_CONSTEXPR const _Up& ::_VSTD_LFTS_V2::get_underlying(const propagate_const<_Up>& __pu) _NOEXCEPT;
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template <class _Up> friend _LIBCPP_CONSTEXPR _Up& ::_VSTD_LFTS_V2::get_underlying(propagate_const<_Up>& __pu) _NOEXCEPT;
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_LIBCPP_CONSTEXPR propagate_const() = default;
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propagate_const(const propagate_const&) = delete;
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_LIBCPP_CONSTEXPR propagate_const(propagate_const&&) = default;
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template <class _Up, enable_if_t<!is_convertible<_Up, _Tp>::value &&
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is_constructible<_Tp, _Up&&>::value,bool> = true>
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explicit _LIBCPP_CONSTEXPR propagate_const(propagate_const<_Up>&& __pu)
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: __t_(std::move(_VSTD_LFTS_V2::get_underlying(__pu)))
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{
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}
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template <class _Up, enable_if_t<is_convertible<_Up&&, _Tp>::value &&
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is_constructible<_Tp, _Up&&>::value,bool> = false>
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_LIBCPP_CONSTEXPR propagate_const(propagate_const<_Up>&& __pu)
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: __t_(std::move(_VSTD_LFTS_V2::get_underlying(__pu)))
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{
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}
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template <class _Up, enable_if_t<!is_convertible<_Up&&, _Tp>::value &&
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is_constructible<_Tp, _Up&&>::value &&
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!__is_propagate_const<decay_t<_Up>>::value,bool> = true>
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explicit _LIBCPP_CONSTEXPR propagate_const(_Up&& __u)
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: __t_(std::forward<_Up>(__u))
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{
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}
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template <class _Up, enable_if_t<is_convertible<_Up&&, _Tp>::value &&
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is_constructible<_Tp, _Up&&>::value &&
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!__is_propagate_const<decay_t<_Up>>::value,bool> = false>
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_LIBCPP_CONSTEXPR propagate_const(_Up&& __u)
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: __t_(std::forward<_Up>(__u))
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{
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}
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propagate_const& operator=(const propagate_const&) = delete;
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_LIBCPP_CONSTEXPR propagate_const& operator=(propagate_const&&) = default;
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template <class _Up>
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_LIBCPP_CONSTEXPR propagate_const& operator=(propagate_const<_Up>&& __pu)
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{
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__t_ = std::move(_VSTD_LFTS_V2::get_underlying(__pu));
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return *this;
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}
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template <class _Up, class _Vp = enable_if_t<!__is_propagate_const<decay_t<_Up>>::value>>
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_LIBCPP_CONSTEXPR propagate_const& operator=(_Up&& __u)
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{
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__t_ = std::forward<_Up>(__u);
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return *this;
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}
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_LIBCPP_CONSTEXPR const element_type* get() const
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{
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return __get_pointer(__t_);
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}
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_LIBCPP_CONSTEXPR element_type* get()
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{
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return __get_pointer(__t_);
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}
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explicit _LIBCPP_CONSTEXPR operator bool() const
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{
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return get() != nullptr;
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}
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_LIBCPP_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 <class _Tp_ = _Tp, class _Up = enable_if_t<is_convertible<
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const _Tp_, const element_type *>::value>>
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_LIBCPP_CONSTEXPR operator const element_type *() const {
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return get();
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}
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_LIBCPP_CONSTEXPR const element_type& operator*() const
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{
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return *get();
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}
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_LIBCPP_CONSTEXPR element_type* operator->()
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{
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return get();
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}
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template <class _Tp_ = _Tp, class _Up = enable_if_t<
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is_convertible<_Tp_, element_type *>::value>>
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_LIBCPP_CONSTEXPR operator element_type *() {
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return get();
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}
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_LIBCPP_CONSTEXPR element_type& operator*()
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{
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return *get();
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}
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_LIBCPP_CONSTEXPR void swap(propagate_const& __pt) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
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{
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using _VSTD::swap;
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swap(__t_, __pt.__t_);
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}
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};
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator==(const propagate_const<_Tp>& __pt, nullptr_t)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) == nullptr;
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}
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator==(nullptr_t, const propagate_const<_Tp>& __pt)
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{
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return nullptr == _VSTD_LFTS_V2::get_underlying(__pt);
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}
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator!=(const propagate_const<_Tp>& __pt, nullptr_t)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) != nullptr;
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}
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator!=(nullptr_t, const propagate_const<_Tp>& __pt)
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{
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return nullptr != _VSTD_LFTS_V2::get_underlying(__pt);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator==(const propagate_const<_Tp>& __pt,
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const propagate_const<_Up>& __pu)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) == _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator!=(const propagate_const<_Tp>& __pt,
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const propagate_const<_Up>& __pu)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) != _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator<(const propagate_const<_Tp>& __pt,
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const propagate_const<_Up>& __pu)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) < _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator>(const propagate_const<_Tp>& __pt,
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const propagate_const<_Up>& __pu)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) > _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator<=(const propagate_const<_Tp>& __pt,
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const propagate_const<_Up>& __pu)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) <= _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator>=(const propagate_const<_Tp>& __pt,
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const propagate_const<_Up>& __pu)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) >= _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator==(const propagate_const<_Tp>& __pt, const _Up& __u)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) == __u;
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator!=(const propagate_const<_Tp>& __pt, const _Up& __u)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) != __u;
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator<(const propagate_const<_Tp>& __pt, const _Up& __u)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) < __u;
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator>(const propagate_const<_Tp>& __pt, const _Up& __u)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) > __u;
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator<=(const propagate_const<_Tp>& __pt, const _Up& __u)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) <= __u;
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator>=(const propagate_const<_Tp>& __pt, const _Up& __u)
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{
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return _VSTD_LFTS_V2::get_underlying(__pt) >= __u;
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator==(const _Tp& __t, const propagate_const<_Up>& __pu)
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{
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return __t == _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator!=(const _Tp& __t, const propagate_const<_Up>& __pu)
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{
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return __t != _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator<(const _Tp& __t, const propagate_const<_Up>& __pu)
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{
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return __t < _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator>(const _Tp& __t, const propagate_const<_Up>& __pu)
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{
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return __t > _VSTD_LFTS_V2::get_underlying(__pu);
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}
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template <class _Tp, class _Up>
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_LIBCPP_INLINE_VISIBILITY
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_LIBCPP_CONSTEXPR bool operator<=(const _Tp& __t, const propagate_const<_Up>& __pu)
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{
|
|
return __t <= _VSTD_LFTS_V2::get_underlying(__pu);
|
|
}
|
|
|
|
template <class _Tp, class _Up>
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
_LIBCPP_CONSTEXPR bool operator>=(const _Tp& __t, const propagate_const<_Up>& __pu)
|
|
{
|
|
return __t >= _VSTD_LFTS_V2::get_underlying(__pu);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
_LIBCPP_CONSTEXPR void swap(propagate_const<_Tp>& __pc1, propagate_const<_Tp>& __pc2) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
|
|
{
|
|
__pc1.swap(__pc2);
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_CONSTEXPR const _Tp& get_underlying(const propagate_const<_Tp>& __pt) _NOEXCEPT
|
|
{
|
|
return __pt.__t_;
|
|
}
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_CONSTEXPR _Tp& get_underlying(propagate_const<_Tp>& __pt) _NOEXCEPT
|
|
{
|
|
return __pt.__t_;
|
|
}
|
|
|
|
_LIBCPP_END_NAMESPACE_LFTS_V2
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
template <class _Tp>
|
|
struct hash<experimental::fundamentals_v2::propagate_const<_Tp>>
|
|
{
|
|
typedef size_t result_type;
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> argument_type;
|
|
|
|
size_t operator()(const experimental::fundamentals_v2::propagate_const<_Tp>& __pc1) const
|
|
{
|
|
return std::hash<_Tp>()(_VSTD_LFTS_V2::get_underlying(__pc1));
|
|
}
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct equal_to<experimental::fundamentals_v2::propagate_const<_Tp>>
|
|
{
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> first_argument_type;
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> second_argument_type;
|
|
|
|
bool operator()(const experimental::fundamentals_v2::propagate_const<_Tp>& __pc1,
|
|
const experimental::fundamentals_v2::propagate_const<_Tp>& __pc2) const
|
|
{
|
|
return std::equal_to<_Tp>()(_VSTD_LFTS_V2::get_underlying(__pc1), _VSTD_LFTS_V2::get_underlying(__pc2));
|
|
}
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct not_equal_to<experimental::fundamentals_v2::propagate_const<_Tp>>
|
|
{
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> first_argument_type;
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> second_argument_type;
|
|
|
|
bool operator()(const experimental::fundamentals_v2::propagate_const<_Tp>& __pc1,
|
|
const experimental::fundamentals_v2::propagate_const<_Tp>& __pc2) const
|
|
{
|
|
return std::not_equal_to<_Tp>()(_VSTD_LFTS_V2::get_underlying(__pc1), _VSTD_LFTS_V2::get_underlying(__pc2));
|
|
}
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct less<experimental::fundamentals_v2::propagate_const<_Tp>>
|
|
{
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> first_argument_type;
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> second_argument_type;
|
|
|
|
bool operator()(const experimental::fundamentals_v2::propagate_const<_Tp>& __pc1,
|
|
const experimental::fundamentals_v2::propagate_const<_Tp>& __pc2) const
|
|
{
|
|
return std::less<_Tp>()(_VSTD_LFTS_V2::get_underlying(__pc1), _VSTD_LFTS_V2::get_underlying(__pc2));
|
|
}
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct greater<experimental::fundamentals_v2::propagate_const<_Tp>>
|
|
{
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> first_argument_type;
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> second_argument_type;
|
|
|
|
bool operator()(const experimental::fundamentals_v2::propagate_const<_Tp>& __pc1,
|
|
const experimental::fundamentals_v2::propagate_const<_Tp>& __pc2) const
|
|
{
|
|
return std::greater<_Tp>()(_VSTD_LFTS_V2::get_underlying(__pc1), _VSTD_LFTS_V2::get_underlying(__pc2));
|
|
}
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct less_equal<experimental::fundamentals_v2::propagate_const<_Tp>>
|
|
{
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> first_argument_type;
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> second_argument_type;
|
|
|
|
bool operator()(const experimental::fundamentals_v2::propagate_const<_Tp>& __pc1,
|
|
const experimental::fundamentals_v2::propagate_const<_Tp>& __pc2) const
|
|
{
|
|
return std::less_equal<_Tp>()(_VSTD_LFTS_V2::get_underlying(__pc1), _VSTD_LFTS_V2::get_underlying(__pc2));
|
|
}
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct greater_equal<experimental::fundamentals_v2::propagate_const<_Tp>>
|
|
{
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> first_argument_type;
|
|
typedef experimental::fundamentals_v2::propagate_const<_Tp> second_argument_type;
|
|
|
|
bool operator()(const experimental::fundamentals_v2::propagate_const<_Tp>& __pc1,
|
|
const experimental::fundamentals_v2::propagate_const<_Tp>& __pc2) const
|
|
{
|
|
return std::greater_equal<_Tp>()(_VSTD_LFTS_V2::get_underlying(__pc1), _VSTD_LFTS_V2::get_underlying(__pc2));
|
|
}
|
|
};
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP_STD_VER > 11
|
|
#endif // _LIBCPP_EXPERIMENTAL_PROPAGATE_CONST
|