| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___COMPARE_ORDERING_H |
| #define _LIBCPP___COMPARE_ORDERING_H |
| |
| #include <__config> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER > 17 |
| |
| // exposition only |
| enum class _LIBCPP_ENUM_VIS _OrdResult : signed char { |
| __less = -1, |
| __equiv = 0, |
| __greater = 1 |
| }; |
| |
| enum class _LIBCPP_ENUM_VIS _NCmpResult : signed char { |
| __unordered = -127 |
| }; |
| |
| class partial_ordering; |
| class weak_ordering; |
| class strong_ordering; |
| |
| template<class _Tp, class... _Args> |
| inline constexpr bool __one_of_v = (is_same_v<_Tp, _Args> || ...); |
| |
| struct _CmpUnspecifiedParam { |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEVAL |
| _CmpUnspecifiedParam(int _CmpUnspecifiedParam::*) noexcept {} |
| |
| template<class _Tp, class = enable_if_t<!__one_of_v<_Tp, int, partial_ordering, weak_ordering, strong_ordering>>> |
| _CmpUnspecifiedParam(_Tp) = delete; |
| }; |
| |
| class partial_ordering { |
| using _ValueT = signed char; |
| |
| _LIBCPP_HIDE_FROM_ABI |
| explicit constexpr partial_ordering(_OrdResult __v) noexcept |
| : __value_(_ValueT(__v)) {} |
| |
| _LIBCPP_HIDE_FROM_ABI |
| explicit constexpr partial_ordering(_NCmpResult __v) noexcept |
| : __value_(_ValueT(__v)) {} |
| |
| _LIBCPP_HIDE_FROM_ABI |
| constexpr bool __is_ordered() const noexcept { |
| return __value_ != _ValueT(_NCmpResult::__unordered); |
| } |
| public: |
| // valid values |
| static const partial_ordering less; |
| static const partial_ordering equivalent; |
| static const partial_ordering greater; |
| static const partial_ordering unordered; |
| |
| // comparisons |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator==(partial_ordering, partial_ordering) noexcept = default; |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator==(partial_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__is_ordered() && __v.__value_ == 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator< (partial_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__is_ordered() && __v.__value_ < 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator<=(partial_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__is_ordered() && __v.__value_ <= 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator> (partial_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__is_ordered() && __v.__value_ > 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator>=(partial_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__is_ordered() && __v.__value_ >= 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator< (_CmpUnspecifiedParam, partial_ordering __v) noexcept { |
| return __v.__is_ordered() && 0 < __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator<=(_CmpUnspecifiedParam, partial_ordering __v) noexcept { |
| return __v.__is_ordered() && 0 <= __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator> (_CmpUnspecifiedParam, partial_ordering __v) noexcept { |
| return __v.__is_ordered() && 0 > __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator>=(_CmpUnspecifiedParam, partial_ordering __v) noexcept { |
| return __v.__is_ordered() && 0 >= __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr partial_ordering operator<=>(partial_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr partial_ordering operator<=>(_CmpUnspecifiedParam, partial_ordering __v) noexcept { |
| return __v < 0 ? partial_ordering::greater : (__v > 0 ? partial_ordering::less : __v); |
| } |
| private: |
| _ValueT __value_; |
| }; |
| |
| inline constexpr partial_ordering partial_ordering::less(_OrdResult::__less); |
| inline constexpr partial_ordering partial_ordering::equivalent(_OrdResult::__equiv); |
| inline constexpr partial_ordering partial_ordering::greater(_OrdResult::__greater); |
| inline constexpr partial_ordering partial_ordering::unordered(_NCmpResult ::__unordered); |
| |
| class weak_ordering { |
| using _ValueT = signed char; |
| |
| _LIBCPP_HIDE_FROM_ABI |
| explicit constexpr weak_ordering(_OrdResult __v) noexcept : __value_(_ValueT(__v)) {} |
| |
| public: |
| static const weak_ordering less; |
| static const weak_ordering equivalent; |
| static const weak_ordering greater; |
| |
| _LIBCPP_HIDE_FROM_ABI |
| constexpr operator partial_ordering() const noexcept { |
| return __value_ == 0 ? partial_ordering::equivalent |
| : (__value_ < 0 ? partial_ordering::less : partial_ordering::greater); |
| } |
| |
| // comparisons |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator==(weak_ordering, weak_ordering) noexcept = default; |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator==(weak_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ == 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator< (weak_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ < 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator<=(weak_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ <= 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator> (weak_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ > 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator>=(weak_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ >= 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator< (_CmpUnspecifiedParam, weak_ordering __v) noexcept { |
| return 0 < __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator<=(_CmpUnspecifiedParam, weak_ordering __v) noexcept { |
| return 0 <= __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator> (_CmpUnspecifiedParam, weak_ordering __v) noexcept { |
| return 0 > __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator>=(_CmpUnspecifiedParam, weak_ordering __v) noexcept { |
| return 0 >= __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr weak_ordering operator<=>(weak_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr weak_ordering operator<=>(_CmpUnspecifiedParam, weak_ordering __v) noexcept { |
| return __v < 0 ? weak_ordering::greater : (__v > 0 ? weak_ordering::less : __v); |
| } |
| |
| private: |
| _ValueT __value_; |
| }; |
| |
| inline constexpr weak_ordering weak_ordering::less(_OrdResult::__less); |
| inline constexpr weak_ordering weak_ordering::equivalent(_OrdResult::__equiv); |
| inline constexpr weak_ordering weak_ordering::greater(_OrdResult::__greater); |
| |
| class strong_ordering { |
| using _ValueT = signed char; |
| |
| _LIBCPP_HIDE_FROM_ABI |
| explicit constexpr strong_ordering(_OrdResult __v) noexcept : __value_(_ValueT(__v)) {} |
| |
| public: |
| static const strong_ordering less; |
| static const strong_ordering equal; |
| static const strong_ordering equivalent; |
| static const strong_ordering greater; |
| |
| // conversions |
| _LIBCPP_HIDE_FROM_ABI |
| constexpr operator partial_ordering() const noexcept { |
| return __value_ == 0 ? partial_ordering::equivalent |
| : (__value_ < 0 ? partial_ordering::less : partial_ordering::greater); |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| constexpr operator weak_ordering() const noexcept { |
| return __value_ == 0 ? weak_ordering::equivalent |
| : (__value_ < 0 ? weak_ordering::less : weak_ordering::greater); |
| } |
| |
| // comparisons |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator==(strong_ordering, strong_ordering) noexcept = default; |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator==(strong_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ == 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator< (strong_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ < 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator<=(strong_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ <= 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator> (strong_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ > 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator>=(strong_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v.__value_ >= 0; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator< (_CmpUnspecifiedParam, strong_ordering __v) noexcept { |
| return 0 < __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator<=(_CmpUnspecifiedParam, strong_ordering __v) noexcept { |
| return 0 <= __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator> (_CmpUnspecifiedParam, strong_ordering __v) noexcept { |
| return 0 > __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator>=(_CmpUnspecifiedParam, strong_ordering __v) noexcept { |
| return 0 >= __v.__value_; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr strong_ordering operator<=>(strong_ordering __v, _CmpUnspecifiedParam) noexcept { |
| return __v; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr strong_ordering operator<=>(_CmpUnspecifiedParam, strong_ordering __v) noexcept { |
| return __v < 0 ? strong_ordering::greater : (__v > 0 ? strong_ordering::less : __v); |
| } |
| |
| private: |
| _ValueT __value_; |
| }; |
| |
| inline constexpr strong_ordering strong_ordering::less(_OrdResult::__less); |
| inline constexpr strong_ordering strong_ordering::equal(_OrdResult::__equiv); |
| inline constexpr strong_ordering strong_ordering::equivalent(_OrdResult::__equiv); |
| inline constexpr strong_ordering strong_ordering::greater(_OrdResult::__greater); |
| |
| #endif // _LIBCPP_STD_VER > 17 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___COMPARE_ORDERING_H |