679 lines
26 KiB
C++
679 lines
26 KiB
C++
// -*- C++ -*-
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//===-------------------------- compare -----------------------------------===//
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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_COMPARE
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#define _LIBCPP_COMPARE
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/*
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compare synopsis
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namespace std {
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// [cmp.categories], comparison category types
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class weak_equality;
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class strong_equality;
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class partial_ordering;
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class weak_ordering;
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class strong_ordering;
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// named comparison functions
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constexpr bool is_eq (weak_equality cmp) noexcept { return cmp == 0; }
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constexpr bool is_neq (weak_equality cmp) noexcept { return cmp != 0; }
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constexpr bool is_lt (partial_ordering cmp) noexcept { return cmp < 0; }
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constexpr bool is_lteq(partial_ordering cmp) noexcept { return cmp <= 0; }
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constexpr bool is_gt (partial_ordering cmp) noexcept { return cmp > 0; }
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constexpr bool is_gteq(partial_ordering cmp) noexcept { return cmp >= 0; }
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// [cmp.common], common comparison category type
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template<class... Ts>
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struct common_comparison_category {
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using type = see below;
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};
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template<class... Ts>
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using common_comparison_category_t = typename common_comparison_category<Ts...>::type;
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// [cmp.alg], comparison algorithms
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template<class T> constexpr strong_ordering strong_order(const T& a, const T& b);
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template<class T> constexpr weak_ordering weak_order(const T& a, const T& b);
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template<class T> constexpr partial_ordering partial_order(const T& a, const T& b);
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template<class T> constexpr strong_equality strong_equal(const T& a, const T& b);
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template<class T> constexpr weak_equality weak_equal(const T& a, const T& b);
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}
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*/
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#include <__config>
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#include <type_traits>
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#include <array>
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#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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// exposition only
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enum class _LIBCPP_ENUM_VIS _EqResult : unsigned char {
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__zero = 0,
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__equal = __zero,
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__equiv = __equal,
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__nonequal = 1,
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__nonequiv = __nonequal
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};
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enum class _LIBCPP_ENUM_VIS _OrdResult : signed char {
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__less = -1,
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__greater = 1
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};
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enum class _LIBCPP_ENUM_VIS _NCmpResult : signed char {
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__unordered = -127
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};
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struct _CmpUnspecifiedType;
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using _CmpUnspecifiedParam = void (_CmpUnspecifiedType::*)();
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class weak_equality {
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_LIBCPP_INLINE_VISIBILITY
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constexpr explicit weak_equality(_EqResult __val) noexcept : __value_(__val) {}
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public:
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static const weak_equality equivalent;
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static const weak_equality nonequivalent;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(weak_equality __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, weak_equality __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(weak_equality __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, weak_equality __v) noexcept;
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY friend constexpr weak_equality operator<=>(weak_equality __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr weak_equality operator<=>(_CmpUnspecifiedParam, weak_equality __v) noexcept;
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#endif
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private:
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_EqResult __value_;
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};
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_LIBCPP_INLINE_VAR constexpr weak_equality weak_equality::equivalent(_EqResult::__equiv);
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_LIBCPP_INLINE_VAR constexpr weak_equality weak_equality::nonequivalent(_EqResult::__nonequiv);
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_LIBCPP_INLINE_VISIBILITY
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inline constexpr bool operator==(weak_equality __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ == _EqResult::__zero;
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}
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_LIBCPP_INLINE_VISIBILITY
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inline constexpr bool operator==(_CmpUnspecifiedParam, weak_equality __v) noexcept {
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return __v.__value_ == _EqResult::__zero;
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}
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_LIBCPP_INLINE_VISIBILITY
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inline constexpr bool operator!=(weak_equality __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ != _EqResult::__zero;
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}
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_LIBCPP_INLINE_VISIBILITY
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inline constexpr bool operator!=(_CmpUnspecifiedParam, weak_equality __v) noexcept {
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return __v.__value_ != _EqResult::__zero;
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}
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY
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inline constexpr weak_equality operator<=>(weak_equality __v, _CmpUnspecifiedParam) noexcept {
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return __v;
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}
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_LIBCPP_INLINE_VISIBILITY
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inline constexpr weak_equality operator<=>(_CmpUnspecifiedParam, weak_equality __v) noexcept {
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return __v;
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}
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#endif
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class strong_equality {
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_LIBCPP_INLINE_VISIBILITY
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explicit constexpr strong_equality(_EqResult __val) noexcept : __value_(__val) {}
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public:
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static const strong_equality equal;
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static const strong_equality nonequal;
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static const strong_equality equivalent;
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static const strong_equality nonequivalent;
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// conversion
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_LIBCPP_INLINE_VISIBILITY constexpr operator weak_equality() const noexcept {
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return __value_ == _EqResult::__zero ? weak_equality::equivalent
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: weak_equality::nonequivalent;
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}
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// comparisons
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(strong_equality __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(strong_equality __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, strong_equality __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, strong_equality __v) noexcept;
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY friend constexpr strong_equality operator<=>(strong_equality __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr strong_equality operator<=>(_CmpUnspecifiedParam, strong_equality __v) noexcept;
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#endif
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private:
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_EqResult __value_;
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};
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_LIBCPP_INLINE_VAR constexpr strong_equality strong_equality::equal(_EqResult::__equal);
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_LIBCPP_INLINE_VAR constexpr strong_equality strong_equality::nonequal(_EqResult::__nonequal);
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_LIBCPP_INLINE_VAR constexpr strong_equality strong_equality::equivalent(_EqResult::__equiv);
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_LIBCPP_INLINE_VAR constexpr strong_equality strong_equality::nonequivalent(_EqResult::__nonequiv);
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator==(strong_equality __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ == _EqResult::__zero;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator==(_CmpUnspecifiedParam, strong_equality __v) noexcept {
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return __v.__value_ == _EqResult::__zero;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator!=(strong_equality __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ != _EqResult::__zero;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator!=(_CmpUnspecifiedParam, strong_equality __v) noexcept {
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return __v.__value_ != _EqResult::__zero;
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}
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY
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constexpr strong_equality operator<=>(strong_equality __v, _CmpUnspecifiedParam) noexcept {
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return __v;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr strong_equality operator<=>(_CmpUnspecifiedParam, strong_equality __v) noexcept {
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return __v;
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}
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#endif // _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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class partial_ordering {
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using _ValueT = signed char;
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_LIBCPP_INLINE_VISIBILITY
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explicit constexpr partial_ordering(_EqResult __v) noexcept
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: __value_(_ValueT(__v)) {}
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_LIBCPP_INLINE_VISIBILITY
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explicit constexpr partial_ordering(_OrdResult __v) noexcept
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: __value_(_ValueT(__v)) {}
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_LIBCPP_INLINE_VISIBILITY
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explicit constexpr partial_ordering(_NCmpResult __v) noexcept
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: __value_(_ValueT(__v)) {}
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constexpr bool __is_ordered() const noexcept {
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return __value_ != _ValueT(_NCmpResult::__unordered);
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}
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public:
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// valid values
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static const partial_ordering less;
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static const partial_ordering equivalent;
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static const partial_ordering greater;
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static const partial_ordering unordered;
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// conversion
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constexpr operator weak_equality() const noexcept {
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return __value_ == 0 ? weak_equality::equivalent : weak_equality::nonequivalent;
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}
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// comparisons
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (partial_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (partial_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (_CmpUnspecifiedParam, partial_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (_CmpUnspecifiedParam, partial_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY friend constexpr partial_ordering operator<=>(partial_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr partial_ordering operator<=>(_CmpUnspecifiedParam, partial_ordering __v) noexcept;
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#endif
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private:
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_ValueT __value_;
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};
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_LIBCPP_INLINE_VAR constexpr partial_ordering partial_ordering::less(_OrdResult::__less);
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_LIBCPP_INLINE_VAR constexpr partial_ordering partial_ordering::equivalent(_EqResult::__equiv);
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_LIBCPP_INLINE_VAR constexpr partial_ordering partial_ordering::greater(_OrdResult::__greater);
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_LIBCPP_INLINE_VAR constexpr partial_ordering partial_ordering::unordered(_NCmpResult ::__unordered);
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator==(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__is_ordered() && __v.__value_ == 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator< (partial_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__is_ordered() && __v.__value_ < 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator<=(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__is_ordered() && __v.__value_ <= 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator> (partial_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__is_ordered() && __v.__value_ > 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator>=(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__is_ordered() && __v.__value_ >= 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator==(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
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return __v.__is_ordered() && 0 == __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator< (_CmpUnspecifiedParam, partial_ordering __v) noexcept {
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return __v.__is_ordered() && 0 < __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator<=(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
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return __v.__is_ordered() && 0 <= __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator> (_CmpUnspecifiedParam, partial_ordering __v) noexcept {
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return __v.__is_ordered() && 0 > __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator>=(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
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return __v.__is_ordered() && 0 >= __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator!=(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
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return !__v.__is_ordered() || __v.__value_ != 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator!=(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
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return !__v.__is_ordered() || __v.__value_ != 0;
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}
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY
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constexpr partial_ordering operator<=>(partial_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr partial_ordering operator<=>(_CmpUnspecifiedParam, partial_ordering __v) noexcept {
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return __v < 0 ? partial_ordering::greater : (__v > 0 ? partial_ordering::less : __v);
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}
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#endif // _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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class weak_ordering {
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using _ValueT = signed char;
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_LIBCPP_INLINE_VISIBILITY
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explicit constexpr weak_ordering(_EqResult __v) noexcept : __value_(_ValueT(__v)) {}
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_LIBCPP_INLINE_VISIBILITY
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explicit constexpr weak_ordering(_OrdResult __v) noexcept : __value_(_ValueT(__v)) {}
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public:
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static const weak_ordering less;
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static const weak_ordering equivalent;
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static const weak_ordering greater;
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// conversions
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_LIBCPP_INLINE_VISIBILITY
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constexpr operator weak_equality() const noexcept {
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return __value_ == 0 ? weak_equality::equivalent
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: weak_equality::nonequivalent;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr operator partial_ordering() const noexcept {
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return __value_ == 0 ? partial_ordering::equivalent
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: (__value_ < 0 ? partial_ordering::less : partial_ordering::greater);
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}
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// comparisons
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (weak_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (weak_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (_CmpUnspecifiedParam, weak_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (_CmpUnspecifiedParam, weak_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY friend constexpr weak_ordering operator<=>(weak_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr weak_ordering operator<=>(_CmpUnspecifiedParam, weak_ordering __v) noexcept;
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#endif
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private:
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_ValueT __value_;
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};
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_LIBCPP_INLINE_VAR constexpr weak_ordering weak_ordering::less(_OrdResult::__less);
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_LIBCPP_INLINE_VAR constexpr weak_ordering weak_ordering::equivalent(_EqResult::__equiv);
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_LIBCPP_INLINE_VAR constexpr weak_ordering weak_ordering::greater(_OrdResult::__greater);
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator==(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ == 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator!=(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ != 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator< (weak_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ < 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator<=(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ <= 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator> (weak_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ > 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator>=(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ >= 0;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator==(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
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return 0 == __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator!=(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
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return 0 != __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator< (_CmpUnspecifiedParam, weak_ordering __v) noexcept {
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return 0 < __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator<=(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
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return 0 <= __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator> (_CmpUnspecifiedParam, weak_ordering __v) noexcept {
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return 0 > __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool operator>=(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
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return 0 >= __v.__value_;
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}
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY
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constexpr weak_ordering operator<=>(weak_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr weak_ordering operator<=>(_CmpUnspecifiedParam, weak_ordering __v) noexcept {
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return __v < 0 ? weak_ordering::greater : (__v > 0 ? weak_ordering::less : __v);
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}
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#endif // _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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class strong_ordering {
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using _ValueT = signed char;
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_LIBCPP_INLINE_VISIBILITY
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explicit constexpr strong_ordering(_EqResult __v) noexcept : __value_(_ValueT(__v)) {}
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_LIBCPP_INLINE_VISIBILITY
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explicit constexpr strong_ordering(_OrdResult __v) noexcept : __value_(_ValueT(__v)) {}
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public:
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static const strong_ordering less;
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static const strong_ordering equal;
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static const strong_ordering equivalent;
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static const strong_ordering greater;
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// conversions
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_LIBCPP_INLINE_VISIBILITY
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constexpr operator weak_equality() const noexcept {
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return __value_ == 0 ? weak_equality::equivalent
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: weak_equality::nonequivalent;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr operator strong_equality() const noexcept {
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return __value_ == 0 ? strong_equality::equal
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: strong_equality::nonequal;
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr operator partial_ordering() const noexcept {
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return __value_ == 0 ? partial_ordering::equivalent
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: (__value_ < 0 ? partial_ordering::less : partial_ordering::greater);
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}
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_LIBCPP_INLINE_VISIBILITY
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constexpr operator weak_ordering() const noexcept {
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return __value_ == 0 ? weak_ordering::equivalent
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: (__value_ < 0 ? weak_ordering::less : weak_ordering::greater);
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}
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// comparisons
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (strong_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (strong_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator!=(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator< (_CmpUnspecifiedParam, strong_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (_CmpUnspecifiedParam, strong_ordering __v) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
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#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
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_LIBCPP_INLINE_VISIBILITY friend constexpr strong_ordering operator<=>(strong_ordering __v, _CmpUnspecifiedParam) noexcept;
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_LIBCPP_INLINE_VISIBILITY friend constexpr strong_ordering operator<=>(_CmpUnspecifiedParam, strong_ordering __v) noexcept;
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#endif
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private:
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_ValueT __value_;
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};
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_LIBCPP_INLINE_VAR constexpr strong_ordering strong_ordering::less(_OrdResult::__less);
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_LIBCPP_INLINE_VAR constexpr strong_ordering strong_ordering::equal(_EqResult::__equal);
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_LIBCPP_INLINE_VAR constexpr strong_ordering strong_ordering::equivalent(_EqResult::__equiv);
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_LIBCPP_INLINE_VAR constexpr strong_ordering strong_ordering::greater(_OrdResult::__greater);
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_LIBCPP_INLINE_VISIBILITY
|
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constexpr bool operator==(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ == 0;
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}
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_LIBCPP_INLINE_VISIBILITY
|
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constexpr bool operator!=(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ != 0;
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}
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|
_LIBCPP_INLINE_VISIBILITY
|
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constexpr bool operator< (strong_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v.__value_ < 0;
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|
}
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|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator<=(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
|
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return __v.__value_ <= 0;
|
|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator> (strong_ordering __v, _CmpUnspecifiedParam) noexcept {
|
|
return __v.__value_ > 0;
|
|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator>=(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
|
|
return __v.__value_ >= 0;
|
|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator==(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
|
|
return 0 == __v.__value_;
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|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator!=(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
|
|
return 0 != __v.__value_;
|
|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator< (_CmpUnspecifiedParam, strong_ordering __v) noexcept {
|
|
return 0 < __v.__value_;
|
|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator<=(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
|
|
return 0 <= __v.__value_;
|
|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator> (_CmpUnspecifiedParam, strong_ordering __v) noexcept {
|
|
return 0 > __v.__value_;
|
|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool operator>=(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
|
|
return 0 >= __v.__value_;
|
|
}
|
|
|
|
#ifndef _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr strong_ordering operator<=>(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
|
|
return __v;
|
|
}
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr strong_ordering operator<=>(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
|
|
return __v < 0 ? strong_ordering::greater : (__v > 0 ? strong_ordering::less : __v);
|
|
}
|
|
#endif // _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
|
|
|
|
// named comparison functions
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool is_eq(weak_equality __cmp) noexcept { return __cmp == 0; }
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|
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool is_neq(weak_equality __cmp) noexcept { return __cmp != 0; }
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|
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool is_lt(partial_ordering __cmp) noexcept { return __cmp < 0; }
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|
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool is_lteq(partial_ordering __cmp) noexcept { return __cmp <= 0; }
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|
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool is_gt(partial_ordering __cmp) noexcept { return __cmp > 0; }
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|
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr bool is_gteq(partial_ordering __cmp) noexcept { return __cmp >= 0; }
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|
|
|
namespace __comp_detail {
|
|
|
|
enum _ClassifyCompCategory : unsigned{
|
|
_None,
|
|
_WeakEq,
|
|
_StrongEq,
|
|
_PartialOrd,
|
|
_WeakOrd,
|
|
_StrongOrd,
|
|
_CCC_Size
|
|
};
|
|
|
|
template <class _Tp>
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
constexpr _ClassifyCompCategory __type_to_enum() noexcept {
|
|
if (is_same_v<_Tp, weak_equality>)
|
|
return _WeakEq;
|
|
if (is_same_v<_Tp, strong_equality>)
|
|
return _StrongEq;
|
|
if (is_same_v<_Tp, partial_ordering>)
|
|
return _PartialOrd;
|
|
if (is_same_v<_Tp, weak_ordering>)
|
|
return _WeakOrd;
|
|
if (is_same_v<_Tp, strong_ordering>)
|
|
return _StrongOrd;
|
|
return _None;
|
|
}
|
|
|
|
template <size_t _Size>
|
|
constexpr _ClassifyCompCategory
|
|
__compute_comp_type(std::array<_ClassifyCompCategory, _Size> __types) {
|
|
std::array<int, _CCC_Size> __seen = {};
|
|
for (auto __type : __types)
|
|
++__seen[__type];
|
|
if (__seen[_None])
|
|
return _None;
|
|
if (__seen[_WeakEq])
|
|
return _WeakEq;
|
|
if (__seen[_StrongEq] && (__seen[_PartialOrd] || __seen[_WeakOrd]))
|
|
return _WeakEq;
|
|
if (__seen[_StrongEq])
|
|
return _StrongEq;
|
|
if (__seen[_PartialOrd])
|
|
return _PartialOrd;
|
|
if (__seen[_WeakOrd])
|
|
return _WeakOrd;
|
|
return _StrongOrd;
|
|
}
|
|
|
|
template <class ..._Ts>
|
|
constexpr auto __get_comp_type() {
|
|
using _CCC = _ClassifyCompCategory;
|
|
constexpr array<_CCC, sizeof...(_Ts)> __type_kinds{{__comp_detail::__type_to_enum<_Ts>()...}};
|
|
constexpr _CCC _Cat = sizeof...(_Ts) == 0 ? _StrongOrd
|
|
: __compute_comp_type(__type_kinds);
|
|
if constexpr (_Cat == _None)
|
|
return void();
|
|
else if constexpr (_Cat == _WeakEq)
|
|
return weak_equality::equivalent;
|
|
else if constexpr (_Cat == _StrongEq)
|
|
return strong_equality::equivalent;
|
|
else if constexpr (_Cat == _PartialOrd)
|
|
return partial_ordering::equivalent;
|
|
else if constexpr (_Cat == _WeakOrd)
|
|
return weak_ordering::equivalent;
|
|
else if constexpr (_Cat == _StrongOrd)
|
|
return strong_ordering::equivalent;
|
|
else
|
|
static_assert(_Cat != _Cat, "unhandled case");
|
|
}
|
|
} // namespace __comp_detail
|
|
|
|
// [cmp.common], common comparison category type
|
|
template<class... _Ts>
|
|
struct _LIBCPP_TEMPLATE_VIS common_comparison_category {
|
|
using type = decltype(__comp_detail::__get_comp_type<_Ts...>());
|
|
};
|
|
|
|
template<class... _Ts>
|
|
using common_comparison_category_t = typename common_comparison_category<_Ts...>::type;
|
|
|
|
// [cmp.alg], comparison algorithms
|
|
// TODO: unimplemented
|
|
template<class _Tp> constexpr strong_ordering strong_order(const _Tp& __lhs, const _Tp& __rhs);
|
|
template<class _Tp> constexpr weak_ordering weak_order(const _Tp& __lhs, const _Tp& __rhs);
|
|
template<class _Tp> constexpr partial_ordering partial_order(const _Tp& __lhs, const _Tp& __rhs);
|
|
template<class _Tp> constexpr strong_equality strong_equal(const _Tp& __lhs, const _Tp& __rhs);
|
|
template<class _Tp> constexpr weak_equality weak_equal(const _Tp& __lhs, const _Tp& __rhs);
|
|
|
|
#endif // _LIBCPP_STD_VER > 17
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP_COMPARE
|