forked from OSchip/llvm-project
320 lines
9.8 KiB
C++
320 lines
9.8 KiB
C++
//===----------------------------------------------------------------------===//
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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_ORDERING_H
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#define _LIBCPP___COMPARE_ORDERING_H
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#include <__config>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_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 _OrdResult : signed char {
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__less = -1,
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__equiv = 0,
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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_HIDE_FROM_ABI _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_HIDE_FROM_ABI
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explicit constexpr partial_ordering(_OrdResult __v) noexcept
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: __value_(_ValueT(__v)) {}
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_LIBCPP_HIDE_FROM_ABI
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explicit constexpr partial_ordering(_NCmpResult __v) noexcept
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: __value_(_ValueT(__v)) {}
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_LIBCPP_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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friend constexpr bool operator==(partial_ordering, partial_ordering) noexcept = default;
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_LIBCPP_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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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inline constexpr partial_ordering partial_ordering::less(_OrdResult::__less);
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inline constexpr partial_ordering partial_ordering::equivalent(_OrdResult::__equiv);
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inline constexpr partial_ordering partial_ordering::greater(_OrdResult::__greater);
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inline 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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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friend constexpr bool operator==(weak_ordering, weak_ordering) noexcept = default;
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_LIBCPP_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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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inline constexpr weak_ordering weak_ordering::less(_OrdResult::__less);
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inline constexpr weak_ordering weak_ordering::equivalent(_OrdResult::__equiv);
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inline 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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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friend constexpr bool operator==(strong_ordering, strong_ordering) noexcept = default;
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_LIBCPP_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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_HIDE_FROM_ABI
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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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inline constexpr strong_ordering strong_ordering::less(_OrdResult::__less);
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inline constexpr strong_ordering strong_ordering::equal(_OrdResult::__equiv);
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inline constexpr strong_ordering strong_ordering::equivalent(_OrdResult::__equiv);
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inline constexpr strong_ordering strong_ordering::greater(_OrdResult::__greater);
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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_ORDERING_H
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