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//===----------------------------------------------------------------------===//
//
// 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/enable_if.h>
#include <__type_traits/is_same.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 20
// 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 constexpr
_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);
/// [cmp.categories.pre]/1
/// The types partial_ordering, weak_ordering, and strong_ordering are
/// collectively termed the comparison category types.
template <class _Tp>
concept __comparison_category = __one_of_v<_Tp, partial_ordering, weak_ordering, strong_ordering>;
#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___COMPARE_ORDERING_H
|
