forked from OSchip/llvm-project
490 lines
18 KiB
C++
490 lines
18 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 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 (partial_ordering cmp) noexcept { return cmp == 0; }
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constexpr bool is_neq (partial_ordering 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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// [cmp.partialord], Class partial_ordering
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class partial_ordering {
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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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// comparisons
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friend constexpr bool operator==(partial_ordering v, unspecified) noexcept;
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friend constexpr bool operator==(partial_ordering v, partial_ordering w) noexcept = default;
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friend constexpr bool operator< (partial_ordering v, unspecified) noexcept;
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friend constexpr bool operator> (partial_ordering v, unspecified) noexcept;
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friend constexpr bool operator<=(partial_ordering v, unspecified) noexcept;
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friend constexpr bool operator>=(partial_ordering v, unspecified) noexcept;
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friend constexpr bool operator< (unspecified, partial_ordering v) noexcept;
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friend constexpr bool operator> (unspecified, partial_ordering v) noexcept;
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friend constexpr bool operator<=(unspecified, partial_ordering v) noexcept;
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friend constexpr bool operator>=(unspecified, partial_ordering v) noexcept;
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friend constexpr partial_ordering operator<=>(partial_ordering v, unspecified) noexcept;
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friend constexpr partial_ordering operator<=>(unspecified, partial_ordering v) noexcept;
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};
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// [cmp.weakord], Class weak_ordering
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class weak_ordering {
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public:
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// valid values
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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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constexpr operator partial_ordering() const noexcept;
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// comparisons
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friend constexpr bool operator==(weak_ordering v, unspecified) noexcept;
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friend constexpr bool operator==(weak_ordering v, weak_ordering w) noexcept = default;
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friend constexpr bool operator< (weak_ordering v, unspecified) noexcept;
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friend constexpr bool operator> (weak_ordering v, unspecified) noexcept;
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friend constexpr bool operator<=(weak_ordering v, unspecified) noexcept;
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friend constexpr bool operator>=(weak_ordering v, unspecified) noexcept;
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friend constexpr bool operator< (unspecified, weak_ordering v) noexcept;
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friend constexpr bool operator> (unspecified, weak_ordering v) noexcept;
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friend constexpr bool operator<=(unspecified, weak_ordering v) noexcept;
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friend constexpr bool operator>=(unspecified, weak_ordering v) noexcept;
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friend constexpr weak_ordering operator<=>(weak_ordering v, unspecified) noexcept;
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friend constexpr weak_ordering operator<=>(unspecified, weak_ordering v) noexcept;
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};
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// [cmp.strongord], Class strong_ordering
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class strong_ordering {
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public:
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// valid values
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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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constexpr operator partial_ordering() const noexcept;
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constexpr operator weak_ordering() const noexcept;
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// comparisons
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friend constexpr bool operator==(strong_ordering v, unspecified) noexcept;
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friend constexpr bool operator==(strong_ordering v, strong_ordering w) noexcept = default;
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friend constexpr bool operator< (strong_ordering v, unspecified) noexcept;
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friend constexpr bool operator> (strong_ordering v, unspecified) noexcept;
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friend constexpr bool operator<=(strong_ordering v, unspecified) noexcept;
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friend constexpr bool operator>=(strong_ordering v, unspecified) noexcept;
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friend constexpr bool operator< (unspecified, strong_ordering v) noexcept;
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friend constexpr bool operator> (unspecified, strong_ordering v) noexcept;
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friend constexpr bool operator<=(unspecified, strong_ordering v) noexcept;
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friend constexpr bool operator>=(unspecified, strong_ordering v) noexcept;
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friend constexpr strong_ordering operator<=>(strong_ordering v, unspecified) noexcept;
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friend constexpr strong_ordering operator<=>(unspecified, strong_ordering v) noexcept;
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};
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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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#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 && !defined(_LIBCPP_HAS_NO_SPACESHIP_OPERATOR)
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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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class partial_ordering;
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class weak_ordering;
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class strong_ordering;
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template<class _Tp, class... _Args>
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inline constexpr bool __one_of_v = (is_same_v<_Tp, _Args> || ...);
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struct _CmpUnspecifiedParam {
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEVAL
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_CmpUnspecifiedParam(int _CmpUnspecifiedParam::*) noexcept {}
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template<class _Tp, class = enable_if_t<!__one_of_v<_Tp, int, partial_ordering, weak_ordering, strong_ordering>>>
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_CmpUnspecifiedParam(_Tp) = delete;
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};
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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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// comparisons
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator==(partial_ordering, partial_ordering) noexcept = default;
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_LIBCPP_INLINE_VISIBILITY friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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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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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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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_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, weak_ordering) noexcept = default;
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_LIBCPP_INLINE_VISIBILITY friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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 friend 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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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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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 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, strong_ordering) noexcept = default;
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_LIBCPP_INLINE_VISIBILITY friend 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 friend 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 friend 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 friend 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 friend 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 friend constexpr bool operator< (_CmpUnspecifiedParam, strong_ordering __v) noexcept {
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return 0 < __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator<=(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
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return 0 <= __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator> (_CmpUnspecifiedParam, strong_ordering __v) noexcept {
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return 0 > __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY friend constexpr bool operator>=(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
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return 0 >= __v.__value_;
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}
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_LIBCPP_INLINE_VISIBILITY friend constexpr strong_ordering operator<=>(strong_ordering __v, _CmpUnspecifiedParam) noexcept {
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return __v;
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}
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_LIBCPP_INLINE_VISIBILITY friend constexpr strong_ordering operator<=>(_CmpUnspecifiedParam, strong_ordering __v) noexcept {
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return __v < 0 ? strong_ordering::greater : (__v > 0 ? strong_ordering::less : __v);
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}
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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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// named comparison functions
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool is_lt(partial_ordering __cmp) noexcept { return __cmp < 0; }
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool is_lteq(partial_ordering __cmp) noexcept { return __cmp <= 0; }
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool is_gt(partial_ordering __cmp) noexcept { return __cmp > 0; }
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_LIBCPP_INLINE_VISIBILITY
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constexpr bool is_gteq(partial_ordering __cmp) noexcept { return __cmp >= 0; }
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namespace __comp_detail {
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enum _ClassifyCompCategory : unsigned{
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_None,
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_PartialOrd,
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_WeakOrd,
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_StrongOrd,
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_CCC_Size
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};
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY
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constexpr _ClassifyCompCategory __type_to_enum() noexcept {
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if (is_same_v<_Tp, partial_ordering>)
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return _PartialOrd;
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if (is_same_v<_Tp, weak_ordering>)
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return _WeakOrd;
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if (is_same_v<_Tp, strong_ordering>)
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return _StrongOrd;
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return _None;
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}
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template <size_t _Size>
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constexpr _ClassifyCompCategory
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__compute_comp_type(const _ClassifyCompCategory (&__types)[_Size]) {
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int __seen[_CCC_Size] = {};
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for (auto __type : __types)
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++__seen[__type];
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if (__seen[_None])
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return _None;
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if (__seen[_PartialOrd])
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return _PartialOrd;
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if (__seen[_WeakOrd])
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return _WeakOrd;
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return _StrongOrd;
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}
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template <class ..._Ts>
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constexpr auto __get_comp_type() {
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using _CCC = _ClassifyCompCategory;
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constexpr _CCC __type_kinds[] = {_StrongOrd, __type_to_enum<_Ts>()...};
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constexpr _CCC _Cat = __compute_comp_type(__type_kinds);
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if constexpr (_Cat == _None)
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return void();
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else if constexpr (_Cat == _PartialOrd)
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return partial_ordering::equivalent;
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else if constexpr (_Cat == _WeakOrd)
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return weak_ordering::equivalent;
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else if constexpr (_Cat == _StrongOrd)
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return strong_ordering::equivalent;
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else
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static_assert(_Cat != _Cat, "unhandled case");
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}
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} // namespace __comp_detail
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// [cmp.common], common comparison category type
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template<class... _Ts>
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struct _LIBCPP_TEMPLATE_VIS common_comparison_category {
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using type = decltype(__comp_detail::__get_comp_type<_Ts...>());
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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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// TODO: unimplemented
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template<class _Tp> constexpr strong_ordering strong_order(const _Tp& __lhs, const _Tp& __rhs);
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template<class _Tp> constexpr weak_ordering weak_order(const _Tp& __lhs, const _Tp& __rhs);
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template<class _Tp> constexpr partial_ordering partial_order(const _Tp& __lhs, const _Tp& __rhs);
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_SPACESHIP_OPERATOR)
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_COMPARE
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